70.5 - 71.5 MHz

The place to discuss reduced bandwidth fast scan amateur television on 70cms and below
g0mjw
Posts: 1247
Joined: Sat Sep 20, 2014 9:15 am

Re: 70.5 - 71.5 MHz

Post by g0mjw » Tue Jun 30, 2020 9:46 pm

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

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G1LPS Terry
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Joined: Mon Mar 10, 2008 10:33 pm

Re: 70.5 - 71.5 MHz

Post by G1LPS Terry » Wed Jul 01, 2020 4:55 pm

Thanks Steve and Mike for the info
Terry

G4FRE
Posts: 119
Joined: Fri May 26, 2017 6:57 am

Re: 70.5 - 71.5 MHz

Post by G4FRE » Wed Jul 01, 2020 7:28 pm

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

radiogareth
Posts: 536
Joined: Wed Jan 06, 2016 9:46 am

Re: 70.5 - 71.5 MHz

Post by radiogareth » Thu Jul 02, 2020 12:04 pm

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
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