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- SDRC and Airspy R2
Re: SDRC and Airspy R2
toggle quoted messageShow quoted text
For listening get the cable out of the picture by mounting it on
At a guess that will buy you as much as 6 dB noise figure.
On 20220709 08:29:00, Simon Brown
What's the S3 noise figure on Band II ? I have maybe 2dB loss in
the 25m RG6, so am wondering what the total NF is.
BTW I put the BPF before
the LNA to help protect it from 144MHz EME high power. I
am not suggesting that a PGA103+ will saturate from normal
Band II situations. However, it has a little bit too much
gain, so a good filter and an attenuator does no harm. The
S3 really is excellent. Just like you said
Hello Simon, I have done
a noise analysis and you WILL benefit from an LNA. I have
a PGA103+ preceded by a band pass filter and it seems to
work very well. However, I am still waiting for a bigger
antenna. I ordered an OPTDES which never arrived. So, I
will ask a few of the local Band II DXers for an
The ELAD S3 is the best Band II
receiver I have. Am thinking about a preamp on the mast
for those very weak stations - if I get close to receiving
weak signals from across the pond (USA, Canada).
I have attached 3 pictures all
with Console running.
The RSPdx is the only on of
these three that has a decent signal. Running uno is
It is the other two that are
causing problems. The native software yields the
same lousy signals. There is a lot of noise on
these two receivers for the station in question. I
have fiddles with the R2 slide controls in both
Sharp and Console. The Elad appears not to have any
RF gain capability.
The frequency I am using for
this exercise is 98.9, 92 watts, 25 km away. I am
using the same antenna for all three radios. The
antenna is pictured in an attachment. Same feed line
to all three radios. My HF+ Discovery works fine
As I said in a previous
message, the Elad S2 is the one that really puzzles
me. I would have expected it to come out the best
(based only on price, that is).
Anyway, please let me know if
more information is needed.
Thanks for looking into this.
On Friday, July 8, 2022 at
11:38:57 PM PDT, jdow <jdow@...>
On 20220708 14:47:30,
George Stein - NJ3H via groups.io wrote:
92 watts not 25.
On Fri, Jul 8, 2022
at 2:24 PM, George Stein - NJ3H via
Further to my last
message. The station in question is 25
km away and running a mere 25 watts.
Using SDR Console:
With the Elad S2 and and the Airspy R2,
the reception was very noisy.
With the Airspy HF+ Discovery and the
RSPdx, the signal was full quieting.
With the edge going to the HF+
This was not a scientific test, just a
casual observation. The only thing I am
surprised about was the Elad S2
I then used the native software for each
device and had the same results.
Regards and YMMV,
- + - + -
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