GB3HV status

GB3HV status

3.4 GHz back on air

GB3HV statusPosted by Noel - G8GTZ Thu, September 10, 2015 09:05:22
A visit on the 8th September saw the 3.4 GHz tx back on air.

Outstanding jobs now include:

Repair the 4th 1248 rx panel
Put the 70cms pre-amp and filter at masthead
Upgrade the PC
146 MHz receiver
Implement proper link switching when BH transmits CTCSS tone

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3.4 GHz off air and Skype fixed

GB3HV statusPosted by Noel - G8GTZ Sun, August 23, 2015 09:49:16
Visit on 19th August fixed the Skype audio problems but the 3.4 GHz Tx was taken off air to look at a blue video problem - will be returned ASAP.

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Power reset on site

GB3HV statusPosted by Noel - G8GTZ Sun, August 02, 2015 18:22:34
Site power went on Saturday - all is now restored.

However the PC seems to have lost it's 2nd VGA output and hence we have no Skype screen at the moment - tried to fix it remotely but seems to need a site visit....

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Rotator working again

GB3HV statusPosted by Noel - G8GTZ Wed, July 22, 2015 16:14:24
The rotator is now fixed :-)

Also BH link audio level should be OK.

Jobs on list still include:
Fix the 23cms panel that failed.
Put the complete system on a longer pole - should help the "LES" problem.
Mount the 70cms pre-amp and filter at masthead.
Put in a RB-TV rx on 146 and 437 MHz :-)
Replace the PC with one with a bit more grunt....

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70cms rotator

GB3HV statusPosted by Noel - G8GTZ Tue, July 21, 2015 13:05:31
The rotator had packed up a month ago - we thought it was pointing North.

Went on site on Sunday and in fact the controller had packed up but the beam was pointing South!

Controller now repaired and should be replaced today.

Also adjusted the BH audio levels.

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GB3BH relay and mast cam

GB3HV statusPosted by Noel - G8GTZ Sat, May 02, 2015 18:42:02
Visit on 2nd May saw a 10 GHz LNB and horn installed so that HV can now relay GB3BH in Bushey Heath.

GB3BH can be viewed using the DTMF code 771 and is also visible on the video quad (DTMF 774) although there is currently no audio on the quad.

The link is over a 55KM path on 10 GHz and only just clears some local trees at the HV end - it will be interesting to see how reliable the link is. It was intended to mount the LNB and horn on the handrail but in order to gain the extra height needed they were temporarily lashed using cable ties between the 23cms and 3.4 GHz antennas - no it wasn't foggy - my iphone lens is scratched smiley

It is planned to have BH as another automatic input on HV, such that when BH is accessed it will transmit a CTCSS tone and HV will see it as a valid input and automatically relay the signal. This involves modification to the logic board and the lack of quad audio will be fixed at the same time.

BH will be on a lower priority input than HV's local receivers and sources and so the BH signal will only be relayed if there is no local input signal to HV.

By permanently linking GB3BH and GB3HV we will hopefully increase activity on both repeaters.

The mast camera (DTMF 776) was also replaced with a higher resolution unit - it is on the same mast as the rotatable 70cms beam but don't forget the mast camera has higher priority than any RF input so you need to switch it off (DTMF 777) before transmitting in to HV.

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Temporary DTMF codes

GB3HV statusPosted by Noel - G8GTZ Fri, April 17, 2015 17:03:26
Visit on 16th April determined South plate aerial had failed.

It was removed and the complete 23cms array rotated by 90 degrees so DTMF commands are temporarily as follows:

*50# Cancels all selected aerials
*51# Selects West aerial

*52# Cancels West aerial

*53# Selects South aerial

*54# Cancels South aerial

*57# Selects North aerial

*58# Cancels North aerial

As the other panels have changed direction results may be slightly different to previous results.

Also the mast camera which had failed was removed for repair / replacement.

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23cms South aerial update

GB3HV statusPosted by Noel - G8GTZ Tue, April 14, 2015 11:20:45
We took 5 steps forward and 1 backwards during the visit last week and a couple of issues still exist:

23cms south pre-amp is still faulty meaning the G8LES filter is still in operation :-(

The mast camera failed during the work last week and shack camera is on DTMF 776

The 70cms pre-amp and filter are still in the shack - these will go at masthead giving another 2dB of gain (hopefully).

Hopefully there will be another this week when Mike is around so we can fix the 23cms rx problem.

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