[Elecraft] sensitvity k4

[E.H. Russell]

>From my experience with other SDR radios, the individual receivers in the K4D won't give it a sensitivity advantage unless they are used in diversity mode. In that case the K4D will have a clear advantage.

ED / W2RF




-----Original Message-----
From: elecraft-bounces at mailman.qth.net <elecraft-bounces at mailman.qth.net> On Behalf Of Joe Subich, W4TV
Sent: Monday, October 12, 2020 8:50 PM
To: elecraft at mailman.qth.net
Subject: Re: [Elecraft] sensitvity k4


On 2020-10-12 8:22 PM, Don Wilhelm wrote:

 > In general, the local noise will mask anything lower than -135dBm.

That may be true for the lower HF bands.  However, on 6 meters or when using the K4 as an IF for VHF transverters and/or EME the noise level will be as much as 20 dB less than -135 dBm.  That may even be true with directional antennas above 20 MHz at suburban locations.

73,

    ... Joe, W4TV


On 2020-10-12 8:22 PM, Don Wilhelm wrote:
> Richard,
> 
> I don't know the answer, but when you get receiver sensitivities 
> better the -135dBm, the exact sensitivity numbers do not mean much 
> unless you have an extremely quiet location.
> In general, the local noise will mask anything lower than -135dBm.
> I expect all K4s models to have better then -135dBm sensitivity.
> 
> 73,
> Don W3FPR
> 
> On 10/12/2020 7:52 PM, Richard Donner wrote:
>> Anyone have an idea which version of the k4 would have the most 
>> sensitivity for weak signals?
>> Thanks  Richard
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