G0MRF converter thoughts
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I just built the G0MRF down converter to 2m. It also has a 739MHz bypass output. Put into a metal case and seems to work fine so far.
vy73 de Florian DF2ET
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Very nice Florian.
It looks much better than mine ! Thank you for the pictures.Is that one of the PCBs from Luciano PT9KK ?
73
David G0MRF
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I get this:
Me too. Works perfect.
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Is that one of the PCBs from Luciano PT9KK ?
Hi David,
yes that true. Luciano did send me 3 pieces. Now going to build the other two for some fellows.
vy73 de Florian DF2ET
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This device with little addition can give a simple way for full duplex and use of single TRX for any frequency HF,VHF or UHF.
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Please check for the ground connection on the mmic IC3. Serge had a lot off pcbs where you have to add this ground connection caused by a fault by his supplier. My worked perfect after doing this rework. There was no information from Serge how many pcbs where effected by this. so if you hear nothing please check that.
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update:
... the information provided was accurate at the time it was written.
Now things have changed and Serge sends to Italy through his website.
Received the RX QO-100 RX Converter today.
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what noise floor level are you getting with this down-converter ?
on an ic-705 with bullseye lnb i get S5 base noise-floor (radio pre-amp OFF)
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what noise floor level are you getting with this down-converter ?
This fully depends on the LNB, the cable length, etc, since the g0mrf PCB does not do any active amplification, only a mixer.
Keep in mind that the noise figure if your receiver is defined by the first stage (hence, the LNB), not your receiver.If the noise increases when the mixer is connected, then the level is high enough. You may want to add an attenuator to the path to your receiver, especially since direct-sampling receivers like the 705 don't do so well with a very high background noise level.
