Jim, Thanks for your report.

I did reconnect the transformer to the 4X splinters using the fine coax and things seem to be working fine that way. I have not tried it with packet data yet but will do that when I can.

The image below is the dif input to one of the receivers. The south trace is offset by 1 cm so we can it it better. Phasing looks good. Noise is due to poor ground in my setup mostly I feel.

I received my 3D printer and I have printed three more of the plastic boxes for the programming board. I will mail you and Chris one maybe tomorrow.

Bob

[cid:D1F394D9-48CB-4B61-913A-21265908B344@StricklinRanch.com]

On Mar 5, 2024, at 4:02 PM, Jim McCullers via pacsat-dev <pacsat-dev@amsat.orgmailto:pacsat-dev@amsat.org> wrote:

I did some analysis on Blinky’s transmitter last night and did not see the spurs Bob saw on his board. My experience with using a spectrum analyzer close in looking for spurs or phase noise is limited so more analysis is needed.

I did look at the harmonics and the second was down 48 db from the fundamental (+15 to -33 dbm). The third harmonic was in the noise and undetectable.

Now, for receiver board surgery.

Jim McCullers WA4CWI

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