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WEATHER CAM & WEATHER STATION DOWN
Were sorry to report
that there is a failure in the link somewhere which has downed our system.
We are aware that our camera and weather station went down at 00:07BST on Monday 12th April 2021, at time of writing We have no news at all, of when we can expect a re-connection. GB7MT will operate as normal as it uses a Microwave RF link to GB7PO.
Were pleased to say were back!
Our logging kit records we returned at 1354Local Wednesday afternoon.
FT 70D RAFFLE
Well done to the winners
of the prizes and thank you to you who purchased a ticket. The profits
made go in to the running of our repeaters.
2nd Prize - Alpha Tronix Power Supply (Ticket 351) G7NKZ Keith
3rd Prize - High Power Glass Insulators (Ticket 377) M0VBD Rob
4th Prize - Ceramic Insulators (Ticket 3) G8IPG Alan
GB7IV UNDER TESTS D-Star / C4FM / FM
Behavioral Tests were made on Saturday 6th March to establish if our "Sinclair" Canadian built duplexers would work successfully on the 2M band.
These test followed others where the D Star repeater would not behave and We were seeking a second test to try theory's out.
We tried with an Icom Repeater "GB7IV ", between 0800 & 1130 also Yaesu DR2 " fusion" type repeater, from around 1200 to 1800L and a pair of Tait TM 8110 mobiles which will form a complete standby GB3SH. from 1800 to 1845L
The tests used in D star, C4FM and FM this allowed different modes to be tested and with FM other non digital users could try it should they have wanted.
The tests consisted around attempting to run the transmitters at different power levels, with in the licence limit, to establish if the transmitter was happy and also importantly if any De sence was happeing, in other words if the transmitter was deafening the receiver, It difficult to establish this with the D star repeater as it wont run FM and neither does it have an S or RSSI meter. But what We did find out was that even at 17 watts our limit the D star repeater was happy.
After lunch it was the go of the Yaesu DR2, We put this in to dual mode, and found out how it operates in dual mode configuration. For the record it only sends its CWID on FM, and it will wait for the end of an over to CWID in FM, however when its time to CWID and its idle, even if the previous QSO was in C4FM, it still goes over to FM and sends the CWID. One or two may of had the surprise then of hearing " GB7IV " as a CWID and may of wondered wat's that?! This is when We started to note the desencing issue, while We were playing on FM.
In the evening We tried the Two Taits bearing in mind : We have had them at the repeater site on air behaving impeccably at 17 watts as GB3SH in to the SH duplexers without a hint of problems for several hours.
These Taits also played up when used on the IV channel and the IV duplexers, curiously it was beaconing as " GB3SH" of course,.. and anyone puzzled by finding a "GB7IV" in the afternoon must of wondered how GB3SH had QSYed! and perhaps even better why there was now two of them!
So the conclusion
So were glad We tried off site as it is more easy to fathom out what is happening when not working in the restrictions, of the repeater site be that the COVID Threat, The cold, it struggled to get above +5C today! And of the dragging all the kit to site in the first place.
We gratefully thank:
2E0TGE 2E0ZBE G4MYS G6DLJ G7AFN G8IPG & M1PVF for working through and help test the repeater system.
Thanks to: ICOM Yaesu and TAIT for some rather good radios to play with!
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The Yaesu DR 2 from the tail connections note "callsign" GB7MT on the repeater, and "GB7IV" on the duplexers. The DR2's are dual band so it was no problems to reprogram GB7MT to become GB7IV!
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The almost complete standby "GB3SH" on GB7IV channel just before its "go", sitting on top of the on air DR2, the top unit is the monitoring unit showing volts and current drawn, also holds the RSSI or S meter and a convenient " tx test inhibit and normal" switch on the front panel, and the electronics to enable the operating "On Battery " ident to be transmitted. Also fitted a thermal probe on the transmitter heat sink, with its display on the panel, this curiously worked from two 1.5 volt button cells in parallel !
SPARE REPEATER & DUPLEXERS
New 145Mhz duplexers
work very well !!
We are pleased to say our desire to have a fully spare working VHF FM repeater ( cold standby ) has been built with Tait TM8100 mobiles, built in New Zealand, it's been soak tested in to a dummy load for several days, for thermal reasons, and tested on air, with the logic, a brand new design by M0XIX to our specifications with some features for ease of use and information. For instance when running on battery back up, a special tone will replace the end of over "Beat". This repeater has been tested with our brand new old stock Sinclair Canadian built Duplexer which was aligned to R7, 145.775 Mhz by Richard G4WFR.
The next thing to
do is take them to site and air test both of them on our aerials. A date
for this has yet to be decided as with everything its COVID dependent.
GB7IV DUPLEXERS GB7SU DMR
After around five
years of trying to get a set of working duplexers for GB7IV, a brand new
set has been successfully obtained privately.
We will need your
help with this experiment.
You will not need
special equipment, for these tests, just a FM transceiver on either the
usual GB3SH channel, or a transceiver on 145.775MHz FM, the old GB3PC
channel with CTCSS on 71.9 Hz. on transmit.
SOUTHAMPTON AMATEUR RADIO CLUB & REPEATER GROUP CLUB NIGHTS ON ZOOM
Since the Covid outbreak
the Southampton ARC holds now a regular get together on Wednesday Evenings
at 19:30 on Zoom Meeting.
Topics range from
projects sharing of information, to subject not radio related but a good
For the Zoom access code e-mail Andy G4MYS at GB3SHSU@gmail.com
Radio history story from the BBC
We are pleased to
announce that our GB3SU & GB7MT Broadcastify links are back on and
connected up. The GB3SU link has been back on for around 6 days.
WEATHER STATIO0N UPDATE
The weather station
returned online today at 16:00. The Weather Cam is still off line and
should return in the next 24 hours
STATION & CAMERA
Update: An engineer is on the way today to fix problem in West Southampton
While the fault in the network has been cleared, it has the effect of this has knocked out our connection to the internet. This fault is a variation on a theme on around 50% of the reason's as to why we lose connection, some of the faults are to do with the linking equipment, all of this as such is is all out of our control. Due to the COVID restrictions We can't go to our site to make our standby alternative arrangements work - frustratingly.