Page 3 of 3

Re: 70.5 - 71.5 MHz

Posted: Tue Jun 30, 2020 9:46 pm
by g0mjw
g7ntg wrote:
Tue Jun 30, 2020 6:39 am
My upconverter is in CQ-TV 267
Its a modified nooelec ham-it up with built in LO
I tried that too. You need to modify the filters but then it works. It doesn't have any front end gain though, so needs a preamp in front. Narrow filtering too is a good idea given all the strong signals kicking around.

Mike

Re: 70.5 - 71.5 MHz

Posted: Wed Jul 01, 2020 4:55 pm
by G1LPS Terry
Thanks Steve and Mike for the info
Terry

Re: 70.5 - 71.5 MHz

Posted: Wed Jul 01, 2020 7:28 pm
by G4FRE
I modified a G4DDK Nacton 70/28MHz Transverter for 71/437MHz operation with an AD4351 local oscillator which works well. See http://g4fre.com/Nactontv4m.htm

I also converted another G4DDK Nacton 70/28MHz Transverter for 51/437MHz operation with an AD4351 local oscillator see http://g4fre.com/Nactontv6m.htm


Dave
G4FRE

Re: 70.5 - 71.5 MHz

Posted: Thu Jul 02, 2020 12:04 pm
by radiogareth
Having looked at the conversion it crossed my mind that each Nokia Dolphin amp has 3 identical input strips which may well tune to the 3XXMHz frequencies mentioned and already have a mixer on each one (wrong place I expect). The wonderful world of surplus......
Gareth
2020-07-02 12.54.52.jpg
2020-07-02 12.54.52.jpg (169.91 KiB) Viewed 604 times