Firmware for a v3 or v4 board mistakenly installed on a v5 or v6toggle quoted messageShow quoted text
would seriously attenuate 80 and 40 meters, but 10 and 20 meters should be unaffected.
Operation on 80 and 40 would be as if the antenna was disconnected, might damage the IRF510's.
Firmware for v5 or v6 on a v3 or v4 board would allow harmonics out on 80 and 40 meters
since only the 30m filter would be getting used, but again 20 and 10 meters are unaffected
Here's what the routine setTXFilters() does in the firmware for v3,v4 and v5,v6 boards:
30m 20m 40m 80m
ver 3,4: abc = 000 100 110 111 (a=0 for 30m, else b=0 for 20m, else c selects 80m not 40m)
ver 5,6: abc = 000 100 010 001 (1 to engage each filter for 20m,40m,80m, but 30m is always inline)
out in the LPF's. Possible, but seems more likely to be trouble further back in the power amp somewhere.
He reports that CW transmissions are also affected, so not an issue of anything prior to the first mixer at D1,D2.
On Wed, Jan 15, 2020 at 06:38 AM, Gary Anderson wrote: