Farnell seeem to be continuing the free delivery.
I've done nothing further with it. I still need to connect the Si570 module output to the LO input on the DigiThin.
I just ordered 25 from Farnell for £5.13, may have a few spare at CAT15....
BTW - if this works we will have to order some more SUP2400.
BTW 2 - what we really need is someone to do a design of a complete unit or perhaps something to go in front of the modified SUP. Spec could be:
Dual band 2 meters and 70cms up to suit a normal NIm or smilar tuner
Good filtering on both bands generally high pass and bandpass..
Good sensitivity on both bands
Switchable front ends?
Powered by the tuner
The 437 performance at 1844.62 MHz was the same as a normal SUP but the 146 MHz output at 2135.1 MHz was about 10 dB down. More investigations to do to find out where it is rolling off but maybe this can be overcome by 146 MHz pre-amp / filters.
If it can be made to work, it does become a very simple and cheap up converter for 146 MHz.
Noel - G8GTZ
I now have a fully working MKII self contained 146.5 Rx with Pye R4002 base station front end, Sup-2400 and sat booster,
plugged into TT-1600 board in my portable Pc, with pre-amp to mount on the Yagi.
Playing with the Xtal swap on another SUP2400 have tested this on the TT-1600 on 21351 all working fine,
also works "very well" on TT-3200, with Baud Rate set to very slow in SR Search Box Expert mode,
as pointed out by Shaun some time ago.
Will catch up with the "USB Tuner" project later...
- 146.5 Rx.jpg (151.08 KiB) Viewed 3755 times
- TT S2-3200.jpg (612.29 KiB) Viewed 3755 times