ICOM 7410 low TX on 160m

1

I have used my IC 7410 for some years. I am very pleased with it. As Winter is on its way I decided to operate on 160m again. The radio works well on all bands but the tx output on 160m is very low. I have tested it with a dummy load and a well matched antenna. I wonder of any else has had this problem?
73 Alan VK7BO

2

How low is low?

Maybe it is the LPF relays.

3

That could be it, the LPF relays in the transceiver. Alan, Are you using an external SWR/ Power meter to examine the RF Power output or just going by what the iCOM is saying?

4

Also see if the input power (Amps DC) is much different on 160 vs 80.

5

Thanks, Yes, I use an external SWR meter, also the one in the Power meter. I checked VSWR at the antenna and the shack end of the feeder and everything between the feeder and the radio.

73 Alan VK7BO

6

Yes, checked thanks. Measured 160m 15 W o/p. 80m 40W, 40m 100W. It does sound like a filter or switching fault.