VK Logger Ham Radio Forum Archive

Hi all, The VK3RGI 3 Ghz beacon has been reinstalled at Carrajung in Gippsland on its new frequency.
Its on 3398.434 MHz with a power of 2 watts GPS locked.
Reports welcome.

Ralph VK3WRE.

Gday Rob. Every thing was normal at the site, the only thing was the frequency was about 300Hz high,
with luck it should come down a bit when the temp stabelises. we will see how it goes....

Cheers Ralph.

The VK3RED beacon 144.436 MHz in far East Gippsland has been off air for the past 8 weeks due to no 240v power.
today the power was restored to the beacon cubical and all is now well.

Ralph VK3WRE

I have a Jackson Labs LTE-LITE running most of the 3RGI beacons, 2m to be added shortly. The unit is available on an evaluation board and would need a distribution amp on the output. check out the link http://www.ebay.com/itm/LTE-Lite-GPSDO-Evaluation-Kit-with-10MHz-TCXO-/171504585820 The evaluation...

Hi Mike, The heat sink is just a flat surface and the PCB is mounted on a spreader plate so not to short out the hybrid sections. What I have done is exactly what you said. remove the PCBs and cut up the heat sink into 3 bits. The spreader plate will let you put the module down on a larger heat sink...

Hi Jayson, the original caps were 4 pf so 10pf sounds about right.

Regards Ralph

For those who have obtained a surplus UHF TV module at Gippstech there is an artical on the VK3BEZ web site

http://www.vk3bez.org/Files/Surplus%20N ... odules.pdf

It is aimed at helping people get the amps going.

cheers
Ralph VK3WRE.

I have built 3 and all have worked ok but I have trouble getting a return loss better than 15db. The slot needs to be the same width all the way along and it is difficult to do as the 32mm tube I used tends to spring appart when the slot is cut. I have had to put 2 small tabs at the feed point to fo...

That was a VK5DJ unit. you can find it on his web page.

Ralph
VK3WRE

sorry Adam its all boxed up in the transverter.

Regards Ralph.

Hi Adam, I use one and can confirm that the 10.6 is the 10 volt +ve rail. the -Ve bias is generated internaly.
FPM and RPM are the directional coupler outputs with anout 5mw in I get 5 watts out after a bit of snowflaking.
TX enable is not required.
Ralph VK3WRE

Here are some photos of two amps Ive built for 3.4 Ghz. They are of a design by DB6NT from the early 90s and use MGF0905 Fets. The small Amp has two devices and is delivering about 2 watts with about 50 mW drive. The bigger Amp has 4 devices and is producing 8 watts with 50 mW of drive. This bigger ...