[Elecraft] KX1 - very quiet on 30m and 20m

[Don Wilhelm]

Bob,

I can't give you a measurement number right away, I do not have a 
working KX1 here at the moment, but that value may be possible tomorrow 
or Friday.
If you do not hear quite a loud signal with the 50 uV output from the 
XG2 (or XG1  with a 20 meter crystal) - with the RF Gain at full 
clockwise and the AF Gain between 25 and 35% of rotation, then there is 
something wrong.

How is the transmit power output?  If that is OK, then the low pass 
filter is likely OK, and you might want to look at T2.

The KX1 audio is not super strong, and having good volume does depend on 
using sensitive headphones.  If your headphones do not have an 
sensitivity rating greater than 108 dB/mW, then your headphones may be 
the major problem, see the KX1 manual page 62.

73,
Don W3FPR

Bob Jones wrote:
> I've just completed a KX1 build with the 80/30m option and auto atu.
>
> It works on all bands but 30m and 20m require the volume control to be fully clockwise and even then it's quiet. I've carried out the recommended checks and everything appears to be fine.
>
> Having read the previous posts on 'low audio' there's an element of subjectivity regarding what this means.
>
> Does anyone know of a definitive measurement I can make to see if this radio is working as well as it should?
>
> For example, I have the XG1 and can inject a 14.060 MHz signal at 1 microvolt or 50 microvolts. With the bandwidth set to maximum, what level of signal should I expect on the input or output of the audio amplifier, or at any other point in the circuit? 
>
> Any advice gratefully received.
>
> Bob, G3YIQ
>
>
>
>       
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