RE: CW Indicator

[Mike Walkington-3]

Hi Tom,

It worked even easier than I thought.  Ran Spectrogram with a frequency
marker set to my SPOT frequency (600Hz). Tuned the 4.00 MHz birdy with the
VFO until it lined up on the frequency marker.  Turned on the SPOT and
confirmed that the two tones were beating.  Then adjusted the CW indicator
trim pot until the solid indication came on. Then found the trim pot limits
for the solid indication and set the trim pot to the middle of the range. A
piece of cake. I can confirm that the indicator works even when upside down
compared to the rest of the world.

Cheers
Mike
VK1KCK
K2 #2599

PS.  Another VK1 is about to commit the dollars and get a K2.



-----Original Message-----
From: Tom Hammond [mailto:[hidden email]]
Sent: Saturday, 29 January 2005 10:50 PM
To: Mike Walkington
Subject: Re: CW Indicator

'Lo Mike!

>I'm hoping that you are still awake..

Possibly not awake when you wrote the message, but I'm awake now... c.
1145Z Saturday. Sorry if I've delayed responding... been fighting a urinary
tract infection that's had my up/down every 3-6 minutes, pissing drops, for
the past four days and I'm starting to tire... heheh! Other things are a
LOT more fun!

>I've just completed building the CW tuning indicator. All has gone
>reasonably well and I am now at the alignment stage.  The problem I'm
having

>here is exactly the reason why I need the tuning indicator ie difficultly
>recognising when the two tones are beating together - but I need to be able
>to do this to align the indicator!
>
>I have the feeling that I should be able to use Spectrogram to align the
>indicator.  I imagine that what I would do is turn SPOT on and tune the
>4.000 MHz birdy until SPOT and the birdy where on top of each other. Once
>this occurs I can then adjust the tuning indicator trimpot until the 10th
>LED comes on brightly and then finess this by setting the trimpot to the
>middle of the trimpot range where the 10th LED is lit.
>
>Does this make sense to you. If not, how do I adjust the proposed

procedure?

Makes perfect sense to me!

If I absolutely could not (audibly) match the signal against the sidetone,
I'd use your method. Using Gram, once yo get the two tones together, turn
the sidetone off and use only the received signal... of course, for the K2,
it really shouldn't matter since the sidetone's injected elsewhere into the
AF Amp, so it should not effect the received signal itself regardless.

Once you get it set at 4MHz, see if you can replicate the act with the 7
MHz birdie as well. The weaker signal from the 7 MHz birdie, may allow for
a more precise final adjustment... though I'm not certain it's truly
required.

Please report on your results.

Cheers,

Tom






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