Re: [K2] Question about tuning K2 for SSB..
Posted by
Don Wilhelm-4 on
Nov 04, 2010; 12:19pm
URL: http://elecraft.85.s1.nabble.com/K2-Question-about-tuning-K2-for-SSB-tp5703977p5705096.html
John,
A 20 Hz mis-tuning of a SSB signal usually will not be noticed, 50 Hz
maybe, and 100 Hz definitely.
So yes, you would normally tune the station until it 'sounds right' and
then transmit. That assumes that you are using the same filter for
transmit and receive.
You can make some trials with tests made with another ham who knows how
you should sound.
Move the filter passband up or down in 25 Hz increments to see if you
have achieved a more suitable position for your voice.
73,
Don W3FPR
On 11/3/2010 10:20 PM, VK7JB wrote:
> Hi All,
>
> I'm learning to drive my new K2/100 and have reached a conceptual block that
> will betray a fundamental lack of understanding, but here goes anyway...
>
> My K2 dial frequency reads about 20hz under the actual frequency - receiving
> WWV on 10000.00, the LCD frequency readout reads 9999.98. That's all good.
> But, when I'm working SSB and want to make contact with a station already
> transmitting on a particular frequency, how do I handle the tuning to ensure
> I'm transmitting on his frequency exactly. Do I tune my K2 to achieve best
> resolved audio receiving his signal, regardless of the actual frequency
> displayed on my LCD, then assume when I hit TX I'll be transmitting exactly
> on his frequency? Or is there any other way to account for this small 20hz
> shift, to make sure I'm transmitting exactly where he is tuned?
>
> I'm running my K2 with the MH-2 mic and last night got reports of "muffled"
> audio. I suspect I'll need to tweak the SSB filter passband position- the
> position looks good on Spectrogram with the low frequency roll off for the
> SSB Tx filter sitting around 300hz, but I understand it may need some
> "optimising" with live audio monitoring. I did wonder if my tuning
> technique was contributing to the problem - perhaps I'm not transmitting
> exactly where they're listening.
>
> I hope that makes sense. Any advice always gratefully received,
>
> 73,
> John
> VK7JB
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