31-12-2022, 03:54 PM
(30-12-2022, 07:34 PM)VK4VU Wrote: Hi Roger,
I gather that you originally posted a picture of the board that you have.
My recollection is that the earlier version had etched striplines for the BPF, whereas the later version used a helical filter. I have built both of these, but for the moment have attached some information on the stripline BPF version.
I know Graham was a big fan of the SNA586 MMIC so I feel sure that device would have been used in the Tx amplifier.
Can you please confirm which version you have ?
73
Rod VK4VU
Fantastic Ron. Yes its the strip-line one I have and that circuit diagram is probably enough to get me started. The ring-mixer and switch are with the board so I was really only looking for what MMIC's were used and the arrangement around the strip lines. If you have a value for the tuning caps and may be on injection level handy that would be all I need to get it going. But don't spend too much time looking as its not to hard to do the suck and see method.
HNY to you and thanks again
Roger ZL3RC