01-01-2023, 04:08 PM
Hi Roger,
I've attached a pdf of the documentation that I have on the V1 board and have added the two images that I sent previously just for completeness.
VK3XDK 70cm transverter V1.pdf (Size: 1.02 MB / Downloads: 345)
Version 1 of this design used an INA02186 as the transmit amplifier and a SGA5486 as the Rx amplifier.
The Version 2 board is more or less the same except that the Tx MMIC was changed to a SNA-586 and the Rx MMIC is an ERA-3 - and of course the BPF is a 3 section helical filter.
As Doug has commented earlier in this thread, the SNA-586 is a discontinued part, but it should be possible to find something suitable in the right package.
The more recently designed board from W1GHZ not only uses more up-to-date devices, but I also note that Paul has adopted a slightly different approach by using 2 amplification stages for each of the Tx and Rx chains, along with some more bandpass filtering. This would help with image rejection etc., and is one of the points raised by VK3XDK in his write-up.
Hope this helps.
73
Rod VK4VU
I've attached a pdf of the documentation that I have on the V1 board and have added the two images that I sent previously just for completeness.
VK3XDK 70cm transverter V1.pdf (Size: 1.02 MB / Downloads: 345)
Version 1 of this design used an INA02186 as the transmit amplifier and a SGA5486 as the Rx amplifier.
The Version 2 board is more or less the same except that the Tx MMIC was changed to a SNA-586 and the Rx MMIC is an ERA-3 - and of course the BPF is a 3 section helical filter.
As Doug has commented earlier in this thread, the SNA-586 is a discontinued part, but it should be possible to find something suitable in the right package.
The more recently designed board from W1GHZ not only uses more up-to-date devices, but I also note that Paul has adopted a slightly different approach by using 2 amplification stages for each of the Tx and Rx chains, along with some more bandpass filtering. This would help with image rejection etc., and is one of the points raised by VK3XDK in his write-up.
Hope this helps.
73
Rod VK4VU