[amsat-bb] Possible trouble with new Icom IC-910H

Andrew Rich vk4tec at internode.on.net
Fri Aug 11 12:23:36 UTC 2017

Peter are you speaking loudly 

The energy in an fm envelope is way larger than a side band transmission

The fact that your reaching an alc level seems to indicate the radio is doing its job

Pity u don't have USB rx

Do you have a software defined radios ? 


Sent from my iPhone

> On 11 Aug 2017, at 10:02 pm, Peter Pauly <ppauly at gmail.com> wrote:
> I bought a used IC-910H on ebay for satellite work an am having a possible
> issue with it.
> I tested the 2m and 70cm transmitter and receiver in FM mode with my
> handheld and they work fine. I hooked up a Bird 43 wattmeter with a 50E
> slug (50W, 400-1000Mhz) and when I transmit on 440Mhz FM I get an
> indication of power output on the meter.  So far so good...
> Then in USB/LSB mode however, I get no indication on the meter, despite
> turning the mic gain up and talking into the mic. I've also up'ed the RF
> power with the little knob and that doesn't help. The red light flashes on
> the rig (ALC indication) and the meter on the rig moves. I can also hear
> distorted audio on my FM handheld (as expected since it's FM and not USB)
> but I'm worried about the lack of power indicated on the Bird.  I haven't
> been able to try CW yet because I don't have the right sized plug. Should I
> be concerned about the lack of power?
> Summary:  Bird wattmeter shows power out on FM, but not on USB/LSB.
> Thanks
> Peter
> W9KG
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