Re: NDB - Airspy HF+ DIscovery versus Hermes Lite 2

Allan Isaacs


I have a couple of aerials, an 80m dipole and a random long wire about 150 feet long.

I use a matching unun with the long wire. The dipole works fine as a receiving aerial on any band and gives me the least local interference due to the feed point being very high and the ends clear of habitation.

I find all digital radios are inherently very noisy compared with old valve superhets.

I suppose most out there haven’t listened to a proper receiver with proper RF tuning and without a PLL.

There’s a challenge…

Allan G3PIY

From: [] On Behalf Of jdow
Sent: 23 December 2021 15:01
Subject: Re: [SDR-Radio] NDB - Airspy HF+ DIscovery versus Hermes Lite 2


You have a really small antenna, perhaps? If not I suspect the Andrus is not setup as nicely as it could be. With a low loss antenna system below even 30 MHz and especially under 10 MHz it is VERY difficult to make a radio too insensitive to receive anything that is out there without reducing RF input gain by 10 dB to even 30 dB due to purely natural noise sources.


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