Transverter News
Now QRV on 23cms (1296Mhz).


I've now built a 23cms linear transverter based on Mark Kilmier VK5EME's excellent kits, I now need to get on the air on microwave activity nights so the regulars know to point their beams in my direction. The transverter is modular with a 576Mhz local oscillator board, the actual transverter (transmit/receive converter), a switching/control board and a power amplifier which gives around 14 watts output. I've built in the facility to control an external/mast head preamp or linear as I don't think the 19 element beam I've got is really enough but I think in my situation the broader beamwidth will be more beneficial.

 


50Mhz.  My 50 Mhz transverter, started a while ago but consigned to the �pending� pile under the bench due to a failed transistor, now resurrected with many thanks to G4HUP is complete at last. The design is Dave G4HUP's as featured in the VHF UHF DX Book . Not totally built to Dave's design my version uses a discrete PA section (2N6080 2N6082) instead of a "brick", giving about 25 watts . During tune up of the receive side (22/10/2000) I was receiving a GD0(zero) station at about S5 on a nice quiet band, so I did a comparison with my �Porlock� based unit, the GD0 was totally obliterated by breakthrough of a 22Mhz IF image station at 10db over S9, this spurred me on to get the transmit side going even sooner! All we now want is plenty of sporadic E and F2. If you're wondering just how good the receive side is, I very rarely give a worse report than I receive, even when running lower power. If you're into construction I can recommend this totally, I have an FT-690Mk2 but this transverter's performance is in another league.

The transverter I was using is based on a "Walford Electronics Porlock" with a discrete PA, I did think it wasn't too bad but after getting the G4HUP working on RX I'm converted if you'll forgive the pun!

70Mhz. Finished construction of a transverter design also from the VHF UHF DX Book for 4m. Receive works well but having problems with the TX side, PA stage was taking off, the PA transistor was being silly! I just have to sort the bias out now, it gets raspy on speech peaks? I haven't done anything with the bias circuit yet as I've got other projects on the kitchen worktop! a 30pW to 100mW wideband power meter and a digital synthesized 6m SSB transceiver, I'll keep you posted.....


Home    Work    Morse    Guestbook