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- NDB - Airspy HF+ DIscovery versus Hermes Lite 2
Re: NDB - Airspy HF+ DIscovery versus Hermes Lite 2
Likely that would be antenna impedance variation and
over exuberance for the matching transformer.
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On 20211227 09:20:58, Max wrote:
On Mon, Dec 27, 2021 at 10:28 AM, Max wrote:
On Sun, Dec 26, 2021 at 03:24 PM, sm6fhz wrote:
If you missed the SAQ transmission on December 24th
you have a new opportunity on December 27th
Thanks Ingolf. Only just seen this so listening.
Eventually heard SAQ this morning. Two video recordings linked for
anyone who is at all interested. First one shows "VVV de SAQ" test
signal from SAQ. Second one they were presumably trying to
optimise antennas as it's just carrier (note the alternator
For those that wanted to see (Simon), ribbon bar in second video
shows the HF+ settings. For Joanne I made sure to engage AGC as
requested. Tried both settings (see second video), and also you
will see preamp on and preamp off. Not much change. Antenna 66ft
end fed wire, so far from ideal at this frequency. With a well
matched antenna I'm sure results would have been far better.
As per 24th compared with HL2 and RSP2Pro. Results exactly the
same. Zero on HL2 (as predicted - below published frequency spec
for unmodified unit) and on RSP2Pro, audible but not really
readable (with juggled settings).
Yes, as per comments, both for 24th and today, antenna always
connected direct, no splitter (I have not got one).
So again in this test 17.2 kHz the Airspy triumphed but at 277 kHz
CHT NDB I've gone back and retested and consistently and possibly
surprisingly the Hermes Lite is the winner over the HF+ by quite a
margin. Next I need to test with better optimised LF antenna
(loop?) and see if the disparity still exists. I still really like
the tiny Airspy, and of course I adore my HL2. Both brilliant bits
of kit for very little money. We are very lucky people to have
such hardware available to us and of course goes without saying
would not be possible without the likes of Simon's superb SDR
Console. There's none better!
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