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The problem with FM/AM modulation and Hermes-lite

linoobs
Posts: 3
Joined: Sat Jan 02, 2021 2:59 pm

The problem with FM/AM modulation and Hermes-lite

#1

Unread post by linoobs »

Hello, there is a problem with FM/AM modulation and Hermes-lite hardware. As on screenshots see, there is a carrier appears at the monitoring frequency if FM or AM modulation is turned on. The bandwidth is not affected.
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ssb.jpg
fm.jpg

jdow
Posts: 235
Joined: Mon Aug 10, 2020 8:17 pm

Re: The problem with FM/AM modulation and Hermes-lite

#2

Unread post by jdow »

You are showing USB at 2.8 kHz on top and NFM at 12 kHz on the bottom. xSB and NFM have completely different bandwidth selections. USB has no carrier, as should be if TX is enabled. NFM has carrier, which should be if TX is enabled. Perhaps you could show your Transmit settings.

PS: Posting the same problem twice is counter productive.

{^_^}

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Simon G4ELI
Posts: 1364
Joined: Thu Aug 06, 2020 7:27 am
Location: Mawnan Smith
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Re: The problem with FM/AM modulation and Hermes-lite

#3

Unread post by Simon G4ELI »

I will check this soon but it does look like a bug.
Simon Brown :shock:
www.sdr-radio.com

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Max
Posts: 222
Joined: Thu Aug 13, 2020 9:47 am

Re: The problem with FM/AM modulation and Hermes-lite

#4

Unread post by Max »

Cannot reproduce that here with my Hermes Lite 2. May be totally irrelevant, but are you running the latest Gateware for your model of Hermes Lite?

Best

Max

linoobs
Posts: 3
Joined: Sat Jan 02, 2021 2:59 pm

Re: The problem with FM/AM modulation and Hermes-lite

#5

Unread post by linoobs »

SW used Hermes-Lite, not "2". It works without any gaskets.

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