Filters

[1lasportsman 1lasportsman]

Sent from Mail for Windows 10
I want to thank everyone for all the response on the lo and hi filters
I tried your advice and they work wonders.
My radio usually runs a s9 with noise and I was able to pull out signals hidden in
It.
This is really an amazing radio
Thanks again for all the help.
Bill
W3WGG
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[Bob McGraw - K4TAX]

Don't recall what band(s) you are working but.........I find it amazing
on the lower frequencies to add in 10 to 15 dB of attenuation and reduce
the RF gain a bit provided marked improvement in the ability to pull
weak signals out of the noise.

The idea advanced to me by others in the know is  legacy receivers such
as the K3 and K3S provide better performance when the receiver noise
floor is about ~10 dB below no signal band noise.     If the no signal
band noise is -97 dBm or about S-5, and accepting the fact the receiver
noise floor is -135 dBm, since we can't change receiver noise floor we
must change the signal level to the receiver.   By adding 15 dB of
attenuation and reducing the RF gain by about ~10 dB, this should put
one in the "sweet spot" for optimum receiver performance.

Works for me every time.  The proper filter adjustments and
configuration also helps.

73

Bob, K4TAX


On 7/1/2018 7:37 PM, Bill wrote:

>
> Sent from Mail for Windows 10
> I want to thank everyone for all the response on the lo and hi filters
> I tried your advice and they work wonders.
> My radio usually runs a s9 with noise and I was able to pull out signals hidden in
> It.
> This is really an amazing radio
> Thanks again for all the help.
> Bill
> W3WGG
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]
>

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