These tests were being made in an attempt to learn how the QRM is electrically made, and where is mixed. For the record: We do know where its coming from, We know the frequencies in use, and how the frequencies mix to produce another signal on our input.
In summery it needs
"offending transmitter 1" and " offending Transmitter 2
" which use one common aerial,.. on what is known as a " circulator
" ( Simplistic explanation: can be thought of as a roundabout for
RF - most of what goes in only comes out of one exit, the other stuff
ends up in dummy loads ) plus GB3 SH transmitter in to our aerial ( of
course ) to play up, this explains why sometimes the QRM is rather short,
does not do it for some time or belches on for some time.
Thus we are trying to see if the problem is with our equipment, or elsewhere,
the following experiments were tried:
* Try another aerial,
further away from the existing aerials.
We put the GB3SH aerial we took down last Monday, and fitted it on a Speaker
stand on the roof for the duration of the test as far away from the aerial
which the Two transmitters are connected too.
This increased the separation from around 15 Feet / 5M to around 75 feet
/ 24M apart, it was hoped this would show if close fitting of the aerials
was the cause. John 2E0ZBE & Mic G6ASJ tested this for us and the
noise carried on unabated!
* try two aerial working
-
As we have two fitted VHF ( /UHF ) colinears ( for GB3 SH & GB3IV
) this is an easy trick for us to try, This was tested by Peter M1PVF
apart from making the receiver deaf this test proved nothing!
* Try the repeater
in to a dummy load, see if the QRM comes down the aerial coaxial feeder
John 2E0ZBE reported hearing the CWID, with a dummy load connected to
the aerial port of the duplexers, but we experienced no QRM despite hearing
both " offending transmitters" , on our monitor receivers, and
keying our tx up.
From this We conclude the signal comes down our feeder cable.
* Try working SH
on batteries & disconnect SH from the AC & AC Earth grounding
looking at: is it coming from the earth bonding - No difference the QRM
continued unabated.
* Try disconnecting
SU & MT from both power and their aerials
is it mixing inside the other repeaters?
No - No difference
So this brings us round to next weeks experiments These will be done on a windless dry day as we need access to the roof again, please bear in mind while we do this GB3SH may be unavailable which will include going off air mid-sentence while we test! Work includes fitting a different transmitter module, and trying a different make of GB3SH, and other stuff.
We thank Alan G8IPG,
Andy G4MYS, and especially: John 2E0ZBE, Mick G6ASJ and Peter M1PVF for
trafficking GB3SH for us while we used their test QSOs to help us hunt
down the problems.
Another Problem Overcome
We have fitted a mains power fail alarm. One of the problems we have is the RCB socket which we get our power from. These are designed to be "Fail safe" in the event of loss of supply, as a result they are prone to tripping out under brown out conditions ( a momentary loss of supply or dip in supply voltage ) and remaining off, leaving us powered by our back up batteries and the UPS machine, with no knowledge of the power trip out!
The machine which
we have fitted monitors the mains voltage, and room temperature, and advises
the team of a mains fail, encouraging a visit to site to reset the RCB!,...
this is sent out by text avoiding the problems of the Internet. This of
course only advises of a power supply fail, another reporting unit will
be fitted soon, and this unit will advise of mains fail, and or power
supply fail, this will be broadcast on GB3SH as a pipping noise, during
overs and CWID which we will all be able to hear!
We have now finished fitting all our aerials, for our repeaters,each now has its own aerial. We have arranged it so that the UHF 4 stack TETRA type aerials is also a mast for the two VHF(/UHF ) colinears.
Much work and expense
has been spent on this installation, the new aerials + new coaxial cable,
T&K brackets and their rawl bolts, 6 shelly mast clamps, all in around
£1300 has been spent, to try and get the best we can from the system's
installed.
With Reference to the full aerial picky, there is other systems on site,
of course, and a redundant 220Mhz Band 3 comms system aerial array, from
the early 1990s, now disused, as Band 3 is part of the Digital DRAB Broadcasting
band, that is the tall guyed 4 stack array centre of the roof, with the
coax hanging off the guy lines!.
Thus three white stick colinears are to do with us. The lowest white stick
is the old GB3SH aerial, which John 2E0ZBE can be seen removing form the
top of " the link to GB7PO stubmast", in picky 2. So the two
4 stack arrays support two colinears and these are the aerials We are
using, The 4 stacks are Jaybeam commercial aerials for the 430 / 440 MHz
band, with a lifespan of over 30 years..
The colinears are modified Dimond X-200, these are of course standard build hammy aerials, from Nevada Radio, which have been modified and upgraded to enable them to withstand the extra movement that being fitted at 160 feet ( 48.76M ) above the ground brings. The elements of these types of aerials are typically simply crimped together, or screwed together. They are upgraded by soldering the crimps, or screw joins up, to ensure continuous low resistance connection between the sections. We use the Dimond X 200 as they have N sockets, and have two pipe support holes unlike the GP 6 from Comet which is fitted with a SO239 socket, these also need soldering up internally to ensure long life expectancy. It is my opinion however, that the internals of the GP6 are of a higher quality. We will do a post-Mortum on the old colinear next week, and will give you a photographic report, of what damage 18 months service with GB3SH and wind-speeds up to 96MPH can bring!
Five of us worked
upon the install on last Monday the Wx was kind and at times during the
afternoon our weather speed logger was not moving, temperatures reached
24.4*C on that roof where we were, according to our on site weather station
"ISouth
502", A lift on 70cm was somewhat "off putting"
to our installers who could not resist responding to General calls on
PMR446 channel 8, French stations in Normandy being worked on PMR 446
Handhelds, also one of the local hams who had gone up Beacon hill, near
Warnford, and a G4 on the Island, there seemed to be more hams on channel
8 then there were on 433.5MHz!. So aside from chasing DX on on PMR446,
We did install one stub mast with the 4 stack for GB7MT and a new Colinear
for GB3SH, so go play and let us know on air, on Facebook, or email GB3SHSU
with your reception reports! We give our thanks to our install team of
the day: SWL Andy, Andy G4MYS, Alan G8IPG, John 2E0ZBE, Nigel G7POC
.
Click Images Below
Antenna Layout
John Old SH Removal
New MT / SH
MT / PO Link
Weather Station
Andy & Alan
New SH Checks
Fixing MT / SH
PO Link & SH MT
Old SH Dismantle Weather Data
Should the fine weather continue to next weekend, then our engineers will be on site Monday 28th September to find out more about the interference which is on GB3SH most weekday mornings.
These tests will result in short off periods, low power output, and different ( test ) aerials being used, and weak test carriers for periods of time, resulting in a noisy output. This work will not start until 0930, users and members will be requested to let us get on with the work, and NOT put signals of their own though during the tests, the date for your diary is MONDAY 28 September, ONLY if the weather is good! Our other repeaters GB3SU & GB7MT are unaffected by the QRM and will operate as normal, and will may be able to field comments though SU
If the exceptionally fine weather continues, then on Monday 21st September 2020 engineering work will be done on site to enable GB7MT to be changed from its temporary aerial to its main aerial, MT as such wont be off air too long, really only long enough to remove the RF cable and fit another, and this will be sometime during the afternoon.
To allow this to happen, a lot of hard work in the direct sun has to be done and GB3SH will also have to go off air for a few hours, from around 1030 AM +/_ 30mins, GB3SH will also receive a new aerial, in part due to wind damage, which may well explain some of the annoying clicking heard during high winds, in recent months
Thus you are asked please, to note the signal levels of the repeaters SH & MT on Sunday, certainly before Monday, and again after the new aerials are energised say late Monday afternoon, and let us know the difference, this can be done on Facebook, in the comments and on the Internet: GB3SHSU@gmail.com
The change may take
some time as mechanical work has to be done, and the aerials and connections
need to be mechanically secure and waterproof!. During this work GB3SU
will be ready for use and not taken off air, as its on a different stub
mast.
GB7MT will be off air for around 30 minutes sometime on Tuesday 1st September, while DC power metering is fitted.
We are fitting the meters as the repeaters no obvious or small "Tx" indicators, as is common these days with most amateur radios equipment.
We are also keen to
know the current draw and voltage of the DC lines to the individual repeaters.
The DC meters will of course show the repeater current drawn, which will
yield a lot of information.
Click picture to expand
With regard to the interference to GB3SH, we need stations who can let us know if they hear data signals on +/_ 2KHz of our input frequency of 145.0625MHz.
This is one experiment
where all of us can help out, be it our regular users, those who monitor
our traffic, and listeners,...who live within 10 miles of Junction 8 of
the M27.
*You will need to listen, but with preference carefully Monitor our input
that is: 145.0625MHz, you will need to have the CTCSS or Tone off, and
squelch as low as it will go before the squelch breaks, with preference
you will be using an outdoor aerial, a vertical or vertical beam for the
monitoring, beams or quads need to be aimed at the repeater station which
is at Hightown Southampton, near to Junction 8 of the M27.
* We are listening for digital noises, ( only digital noises - on this occasion ) these sound like a harsh buzz or rasping noise, this traffic is somewhat intermittent, but is enough to cause annoyance to the repeater, it does not happen all the time, It seems more prone to occur from 08:30 to 10:00 weekdays, the interference is momentary; lasting form less then a second to up to four or five seconds at a time.
* Purpose of the test is to establish firstly if a ("mixing") fault or problem is causing the accidental transmission on our input, from the transmitter(s) involved, We are also trying to work out how bad the problem is by asking stations in a 10 mile radios to report their finding to us, and we for our part will report back to you on our web site and Facebook pages our findings.
We Would like to
know:
1 if you can hear it,
2 or if you cant hear it , this is useful too,
3 and your station approx. location,
a detailed log is not required,
4 all this data can be sent to us by e-mail to GB3SHSU@gmail.com
Note you will-not
hear the QRM on the repeater output unless there is a QSO in progress!
it is the input we are asking you to monitor please
We are pleased to say we know what is causing the on going morning QRM on GB3 SH, and even better where its coming from, and it's frequencies.
As a result of cooperation from the equipment's service company manager, Peter G6GFA, to whom we say a great many of thanks, tests have already been made to prove the source, that was done last Sunday evening, the problem being is its very, close in distance from our aerial.
Indeed this equipment cased us grief when We first put SH on air, and We were able to reduce interference from it by using an AFL built, 145Mhz tuned band pass filter, in the receiver positioned in the coaxial cable.
This filter allows the 2M band signals through with very little loss, and gives attenuation outside our band in the order of some 60db. However only half the other system was in use, last week the second transmitter of that system was reintroduced, after some time not being on site, this second transmitter is only 300Khz from the first in frequency, all be it around 170MHz.
We also know it only
happens when both transmitters operate at the same time, much of the time
these two are not transmitting simultaneously, and during that time we
receive no problems.
Tests
We know a receiver filter almost kills it, so there are further tests
to be done, and one of the simplest is to put another filter in, but this
time in the transmitter coaxial cable.
Thus on Wednesday afternoon GB3SH will be off for a while, while its TX
filter is put in circuit, for the technically minded its an AFL band pass
filter, with an insert loss of around 1db measured at our TX frequency,
and on the interfering transmitters frequency it has an attenuation of
some 84.3db.
Why a TX line
filter?
Of course We accept that GB3SH transmits on 145.6625MHz.. Why should we
be interested in a deep null on 169MHz? The reason for this is one of
the possible faults causing the interference is a mixing process where
the others transmitters power gets into our transmitter and "mixes"
causing the interfering signal, but giving those transmitters a notch
of 92bd, We will prove one way or another that is / not the cause. Need
less to say it will be in for a few days as We monitor the effects and
decide how to progress forward. One unwanted effect of this is a slight
loss of power, where does the lost power go? into heating up the filter
! is the correct answer. We are pleased to borrow this filter from one
of our members, and thank him,..as purchasing one would be in the £600
mark!
All Of our repeaters will be subject to service interruption on Monday 24th August, GB7MT & GB3SH in particular may be off for several hours late Monday Morning, this is to correct a wiring fault which left GB7MT off air after a "brown Out", a low voltage AC event last week. It is hoped all will be well by 1400 Local.
GB7MT Went off air between 1200 & 2100 hours Tuesday 18 August 20, due to the RCB socket, which supply's the AC to our repeater station dropping out, as there had been a momentary drop of the AC supply.
We have off course battery back up, however a wiring connection error meant that MT is only connected to the AC power supply! and not its rack back up battery as well, resulting in MT going off air.
The RCB was reset at 1014 Wednesday morning, Having located a miss-wire to the DC supply buss, this will be corrected so MT can Join SH on the back up battery soonest, this will mean a de-rack of-the equipment to do a simple soldering job!
The battery had been happy to supply SH since the AC fail.! Co-sited GB3SU was also on air from its own battery power.
For the technically minded we have over 380Amps hours of battery back up for the repeaters alone, with an additional UPS machine power linking, and AC equipment.
We will endeavor to fit a "pipper" to give an audible indication of AC failure soonest as well!
We have a heavy buzzing, at the end of overs sometimes. The effect of this is to slightly deafen the GB3SH receiver, fortunately the CTCSS receiver filter cuts out the QRM very quickly.
It is digital signals,
likely coming from a co-sited communications system, We are fortunate
in as much as we know who runs this system, and have already spoken to
the manger who runs what we thinks is the system responsible. We hope
to be on our way to resolve the problem week starting 24 August.
Thus there is no need to fill in QRM reports on this one, - as we know
all about it! In the mean time GB3SU is doing very well a simple QSY to
UHF should get you away from the QRM
S.H.R.G. QRM REPORTER
The South Hampshire
Repeater Group take QRM to our repeaters quite seriously. We have now
set up a very quick and simple reporting submission form.
We are asking our users to report any interference either input or output
that has interfered with their use of the repeater.
The QRM maybe legal or an illegal source but we have to document this over a period of time to make a full submission to OFCOM
Thank you for your help in making and improving our repeaters
Click Here For The On Line Form You can also e-mail any reports that you may have collated to Andy G4MYS qrmshsu@gmail.com
The QRM see picky QRM 1 which is the display of a spectrum analiser, it displays from just below 434.5MHz to just above 436.5Mhz, it shows the pairs pulses which make up the QRM, as the Horizontal bars the red line up the middle is the input to GB3IW, We can see from this the deviation on the input signal on IW and the wide deviation signal of the QRM.
So We know:
* its data,
* Is on from around 0830 to 1230 each Monday / Thursday, only.
* It is vertical, the horizontal signal is way down in signal strength,
more work will be done on measuring that tomorrow
* its across the 70cm Band, of interest,
is its not so close to our outputs, as if they are deliberately not running
near our outputs!
there are several pairs which appear and disappear in an order, you can see overlapping signals to the right of the vertical red line, the lower display is called a waterfall, and this displays a moving display from now back in time over around 30 seconds, the top display shows how powerful in relative terms the signals on any given frequency.
* The strongest at
the repeater site comes from the north
From the roof of the repeater site we can detect many signals and directions,
we attempted to locate the strongest which comes from the North. We looked
for this signal in the Winchester area, and it is so strong the receiver
could hear it without an aerial, Ive never known that receiver do that
before, we were in open country no where near any mast! So we know
*its not running low power
It can, and does jam at the same time:
GB3SU Thornhill, Southampton
GB3IW Hills above Ventnor IOW
GB3AW Ashmansworth Andover
We are interested
in suggested hot areas spots far we have:
Southampton western docks although we know who operates kit in the docks
and they suggest this is a false lead.
Woolstone area
fareham
HMDY Portsmouth
After the One from
the north has been tracked down, We'd like another to go find!
Please feed us with information , like signal strength + direction GB3SUSH@Gmail.com
At this time all
of this bring up more questions:
The purpose of all this QRM?,
legality?,
who's running it?
also why only weekday mornings?
wheres it coming from?.
Answer some of
these questions and we may get to work this QRM out! and get it dealt
with!
As to why have we not heard it before? simply as we had an inefficient
aerial that could not hear it!
Put up a proper aerial like a 4 stack and we inherit QRM!
Can I help?- yes
get out and df your local strong signal please and let us know what you
find! photograph what you find! or feed us information! GB3SUSH@Gmail.com
Click to Download Analyser Video HERE
QRM 1 (Click to Make Bigger)
Aerial Improvement programme started.
We have started on our aerial improvement programme, delayed of course by the needs of controlling COVID, the first pair was GB3SU and GB7IV, who's aerial is carrying GB7MT signal. The costs of getting on air, and resultant depletion of funds, and interference had resulted in the previous temporary "get you going" system, which saw SU using a low dipole which was screened to the south East.
SU is on a 4 stack "TETRA" style commercially use intended, Jaybeam aerial, these are rated for 155 MPH winds., we for our part have installed the aerial system to a high mechanical standard, as you can see from the photographs using three SMC mast clamps rather then two, adding brass washers on the plates to spread the load, thick wall 2" commercial grade aluminum tube has been used, the feeder has been cable tied up the 4 stack for the VHF operations of GB7IV. The aerial connections are protected by insulation tape, encapsulated with "Denso" tape which is used by commercial riggers and Gas fitters, to prevent rusting of gas fittings on steel pipework, as it is 100% effective, for decades! Its a corrosion preventive tape can be described as a gauze in a green snotty, slimy muck, which sticks by the nature of the "muck" to everything, esp hands. It can be brought from Ebay, for £7 for 10M, and unlike the inferior self-melting tape does not have a short shelf life!
The SU aerial is giving a good account for itself and we really welcome reports good and bad, it seems that from reports so far that its been a win, win, win situation.
GB7MT is on the IV aerial, until its 4 stack is fitted next month, this install will take much more effort from our installers, and will take two days to achieve as a new feeder has to be drawn through, The colinear for SH will need beefing up first, and tested, thus that too will gain from being at full working height.
Having partly achieved a good aerial system for SU, we are frustrated by unexpected interference issues of pulsing noises which seems only to occur in the working week from around 0900 to 1200 ish, and is only noticeable when someone is transmitting, ( on the input ) We would like further information on this QRM. As to where it is, please, and DF information please - for instance can you hear it? on the input?... bearing in mind to hear it there needs to be someone else transmitting you can also hear! The reason for this is its wide band and really one needs a wide band ( FM broadcast style ) filter to hear it!! We are actively encouraging as part of the self learning part of our hobby the tracking down of this QRM..using low cost home built aerials such as the HB9CV.
We have been asked: is it the on site weather station ( ISOUTH 502 ) which is on 868Mhz? The answer is no, as Andy G4MYS, and G7POC, have exactly the same type of wx stations, while they do pulse, its only about once a minute, our QRM is around 90 pulses a minute, and we would of sussed that some time ago,- its not a problem!
Is it the traffic lights was another? We don't know yet! However it only seems to operate when its needed viz 0930 till 1230 weekdays!
Email to GB3SHSU@gmail.com many thanks
We give our thanks not just to the three lads involved in the fitting of the aerials, but also to all the working members who by their actions like sales at rallys, and selling donated equipment, to which we also say a big thanks to our kind donors, We have got the funds together to purchase over £1000.00 worth of new aerials and feeders to make this project as good as we can get it.
SH & MT will
receive their new aerials soonest COVID restrictions , the weather allow
as of mid July this looks like mid August! Around the 14th !
REPEATER DAY (UPDATED 04/07/2020)
We have been invited
to play on a usually switched off UHF repeater on SUNDAY
5th JULY, 10:00 - 17:00. Possibly
to 19:00 if required.
This is a very well sited repeater to the west of Winchester, high up
on a mast! - for doing range testing of the repeater site. You are invited
to join in using handhelds, mobile and base stations.
RX 438.400MHZ (NO TONE). TX 430.800MHZ
(NO TONE) that is to say neither CTCSS or 1750Hz tone burst is needed
to get in!
Of course running 71.9Hz wont hurt, its simply not needed!
Programme up your radio before you go, as the splits are non standard
: Note RX on 438.400Mhz and TX on 430.800
a minus (-) shift of 7.6Mhz is used!
We have particular
interest in:
Romsey, and surrounds,... the A338 Ringwood to Salisbury.... parts of
the New Forest in particular along the A31, if you want to wander of the
main roads on a hand held please do so, call in and let us know the national
grid reference
In particular we'd
like you to think about where your going before hand, and work out your
national grid squares.
( They start SU in Hampshire area or SZ for the Island ) at the places
you intend to call in from!
We'd also like you to log your journey with us in advance to try and ensure we don't all go to the same place! You can do that by contacting john.benton@raynet-uk.net
Ideally we would like you to pull over and specifically work the operator station callsign ++++++ at the specific points you have identified.
If your having trouble with the National grid system you can chat to myself Andy G4MYS on our repeaters SH SH MT repeaters about it, as I was with the Ordnance Survey for a number of years, and am very familiar with national grid reference system! or e-mailGB3SUSH@gmail.com
There is a website called Grid reference finder gridreferencefinder.com on which you can get a National grid reference to to either 6 or ten digits
Andy group Chairman.
Our Weather station "ISouth502" is back on air after the problems were fixed today, Mon 15th July, we are pleased to say and Thank those involved, one of whom is also a ham for their hard work and diligence in sorting out what was a complex fault,
So go enjoy: You can look it up directly as "ISouth 502"
go via "Undergroundweather" and follow the on screen instructions, which is hard work,
or go via our opening screen on GB3SH.CO.UK tab "WEATHER"
Andy
STREAMING & WEATHER
Both Broadcastifty
our live radio audio stream service to the internet, and the On site weather
station "Isouth 502" which is available on Weatherunderground,
have been out of order for a while due to different faults which are nothing
to do with us!
Broadcasfifty have been having trouble with their computers and hand over
systems in the USA, they should now be running as usual, and you are invited
to also inform us of problems at GB3SHSU@gmail.com
The problem with "Isouth 502", the weather station is very different
in nature, being down to the route between our repeater internet switch
and the outside world. We are informed that this should be in order by
mid next week, and look forward to seeing the data once again.
The GB7MT wx station is off air due to failure in telecomms equipment which is beyond our control. We understand from the engineers who run the comms system that It will be fixed in the week ending 12 June.
The Wx station itself, is still gathering information, and is sending that data via a UHF link to its base station, which talks to a USB hub, there should be no need for intervention to recommence the data stream. The station is privately funded by members of the committee, for the sole purpose of monitoring wind speeds on site, for assessing potential wind damage to the aerials,.. so far the highest speed experienced was 96MPH last November, which is excellent news for white stick colinears as -- were still on air!
Our thanks go out to those involved in sorting out the problem, which has proved interesting to say the least!
After COVID 19 is over we plan to add a camera to the station, looking at the horizon, for weather observation purposes, which will make it significantly more interesting.
Andy
Communications Manager | April 17, 2020
Watch The Video Click Here
The Radio Society of Great Britain, working in partnership with the NHS, has launched a new campaign called “Get on the air to care” to support the emotional health and wellbeing of 75,000 licensed UK radio amateurs – just some of the 3,000,000 worldwide.
Paul Devlin, NHS England Emergency Care Improvement Support Team and RSGB District Representative, says: “Now, more than ever, we need to optimise all modes of communication to help reduce loneliness and isolation within communities. Amateur radio provides a wonderful, unprecedented opportunity to help make this a reality”.
World Amateur Radio Day on Saturday 18 April celebrates this innovative, global community. Whilst amateur radio evolves continually to include technologies which are at the forefront of modern radio communications, radio amateurs can “Get on the air to care” with a simple handheld device.
Steve Thomas, M1ACB, General Manager of the RSGB explains: “Please help to increase amateur radio activity through club and repeater group nets, chatting with your friends or just by calling CQ. If you’d like to show your support for the NHS at the same time, Ofcom is happy for radio amateurs to add “/NHS” to the end of their call signs.”
GB1NHS, the UK’s National Health Service radio communications station will be on the air as part of this campaign so listen out for it!
Our new “Get
on the air to care” web page at rsgb.org/gota2c
includes our launch video so do take a look.
As you get involved
in “Get on the air to care” by being more active on the radio,
please share your photos, video clips and news with us via comms@rsgb.org.uk
and also on social media using the hashtag #GOTA2C
GB3SH
- OFF AIR
Were are sorry to announce GB3SH is of air due to a fault in the receiver,
due to the Covid 19 were not in the position to do anything about it for
some time, we do have another receiver of course but still we cant fit
it! As this is a rx based problem the TX and logic sound fine and hopefully
the CWID will keep you and me company for many weeks, meanwhile service
is normal on SU & MT.
Andy G4MYS
GB3SU
CW ID
We have noticed that the cwid on GB3SU is very LOUD, were sorry about
that! as a quick work around set your CTCSS in decode also and you will
not notice the CWID
Need less to say there is nothing were going to do about it for the time
being - as its a fault in the audio generation of the pips & CWID
which is likely to be a dodgy skeleton pot in the G3RKL mk1 logic board
which is around 23 years old! which means the CWID & pips may totally
misbehave: it may go loud or soft or anywhere in between before we get
the chance to repair it.
Andy G4MYS
We were due to be set up in April at Kempton Park but as you will read this has been postponed.
IMPORTANT NOTICE FROM RADIO FAIRS TO TRADERS
With the current situation of what is now called a pandemic break-out of the Coronavirus COVID-19, it is with great regret that we have to announce that it has been decided to postpone the Kempton Rally that was due to be held on Sunday 19th April 2020. We have been able to secure a date for the postponed rally of Sunday 15th November 2020.
After a lot of thought we considered it would be prudent to do so due to health considerations. It has been postponed on the grounds that it is advisable to avoid and keep away from gatherings or events where there is an increased possibility of contracting or spreading the virus regardless of appropriate measures being taken. As you will be aware we have lots of people attending who are advancing in age and may not be in the best of health, added to which the event is normally very crowded and there is no way of avoiding close contact.
If you have booked already and payment has been made, we will hold the money over for the next event. Please keep the paperwork that you will have already received.
By November we hope that it will be business as usual.
Sorry for the inconvenience caused, we hope you will understand and continue to support us.
Paul Berkeley
Radio Fairs
Technical
Update
The groups technical team has been working on getting a set of duplexers
working for GB7IV, the greatest problem here is the new cost of such units
new which is around £2,500. Second hand units have there own problems
as we have found which includes theft of parts, parts not being suitable
on the ham band, and stowage corrosion, which can be in the base and internally
on second hand kit.
In order to get just 4 filters going we have brought a number of "cans" and made the very critical length cables after a lot of careful research, and have selected the best pairs to work with. We have checked them, and need to do further work on the caverty jump cables lengths.
More alignment and testing will happen in the next two weeks, after that On air testing will happen, with the D-star repeater before its moved to the repeater site. And then even more testing will have to happen to settle down two VHF repeaters very close together. Affer all that the D-star repeater machine wont be internet connected as we are still trying to understand the Centross operating system.
We understand some
of you are asking about a Fusion repeater, the simple answer is The IV
group has a D Star repeater, We may be able to borrow a fusion repeater
to play with, but at over £1000 if you want us to run one on VHF,
then hands will have to go into pockets! Let us know its for the "fusion
fund" then we will know if these are serious "wants" or
just someone else can pay for it, and ill use it requests.
It has to noted that most of the funding comes from a small percentage
of our user base, and the efforts of the committee at rallys ....
Southampton Amateur Radio Club Meeting WEDNESDAY 18th March 2020
The Southampton Amateur Radio Club meet at The Peartree Inn Southampton on the 3rd Wednesday of every month.
We The South Hampshire Repeater Group are also there for any questions and to report progress.
You can also get information on the Radio Amateur courses for those starting and those who wish to progress.
New and old members always welcome. Good to see some of the old members coming back and returning to the airways.
WEDNESDAY Evening: 18th March at the Peartree Inn, Woolston, SO19 7GZ
19:00 for 19:30 : large car park, no worries parking!
Drink policy: we purchase our own they sell soft drinks / Coffee, water and booze! however they don't do meals.
Southampton
Amateur Radio Club Meeting WEDNESDAY 19th February 2020
The Southampton Amateur Radio Club meet at The Peartree Inn Southampton
on the 3rd Wednesday of every month.
We The South Hampshire Repeater Group are also there for any questions and to report progress.
You can also get information on the Radio Amateur courses for those starting and those who wish to progress.
New and old members always welcome. Good to see some of the old members coming back and returning to the airways.
WEDNESDAY Evening: 19thFebruary at the Peartree Inn, Woolston, SO19 7GZ
19:00 for 19:30 : large car park, no worries parking!
Drink policy: we purchase our own they sell soft drinks / Coffee, water and booze! however they don't do meals.
The new four stack antenn system being tested in Chandlers Ford. There is also a picture of the monitoring antennas that we installed for the web monitoring stream on line very soon.
Instalation of the four stack to the MT SU site will be soon whern the weather improves.
The Engineers insist on warm no wind and plenty of hot soup!
G4MYS
Its a Brand new aerial from "Jaybeam wireless", A 4 stack "tetra" style dipole array aerial nearly 10 feet high! rated to withstand 160MPH winds and handle 200 watts of power, We will also With a the new aerial for GB3SH as well !
We'll also have an FT 100M the Yaesu Fusion mobile used to work GB7MT for your interest.
Bring your cameras!
The next meeting is at The Peartree Inn
Wednesday 15th January 7:30pm SO19 5GZ