[Elecraft] On zero beating

Fri Jan 18 12:59:44 2002

Assuming you are seconding "Since the K2 has a frequency counter logic" =
and using that for Rx freq. adjustment; a) it wouldn't work and b) there =
is a better way.=20

Years ago I built a box with 5 LED's and PLL (741's - DTML decoders, if =
memory serves)detectors driving them tuned for for 700, 750, 800, 850 =
and 900 Hz drive. I tweaked the circuits so they'd light one at a time =
as you tuned the rig. You'd spin the knob to make the center LED cycle =
in time with the "interesting" signal. It worked like a charm, but I've =
not used it in years. I guess I could find the Etching art. I believe =
there was even a graphic on the board of an Eyeball and "WG4S TuneEye". =
I even had it set so the direction of the turning of the knob followed =
the movement of the illuminated LED. I set it on top of the rig right =
over the "big knob".

Nowadays, I just leave Spectrogram running with a mark at 600 Hz (My =
older ears now use a lower offset than in my 800 Hz youth). Put the =
spiking peak on the red line and bingo. Of course, you now have to =
backpack your laptop too, but then how else you gonna get your email out =
on the Appalachian Trail?

BTW, the reason your idea wouldn't work is that the logic would have no =
way to know WHICH peak to track. There is no reason not to work station =
X at x005.40 KHz, and have a slightly stronger station Y at x005.80 KHz. =
How'd the logic know which one to displayif you are on x005.60? Ain't =
these filters grand! With the old WG4S TuneEye it was trivially easy to =
track the right signal, as it is with Spectrogram.

Now, the 5 led's might still be a good idea. With the brain-power in =
this group and modern parts, we could probably get the size way down. =
Mine was a 1.5 x 5 inch board in a 2x6x6 steel box! It really was sweet! =
[I even put a sidetone on the center light for true noise free copy. It =
was useless, because a signal clean enough to drive the sidetone with =
anything close to morse code was strong enough to not need digital =
"assistance"]. The box was BIG, tho. Getting 5 more carets on the LCD =
might be a big deal, tho. Maybe a 0.5x2x1 box on top? Thoughts guys?

Dan / WG4S

-----Original Message-----
From: [email protected]
[mailto:[email protected]]On Behalf Of
[email protected]
Sent: Thursday, January 17, 2002 5:04 PM
To: Steve Lawrence
Cc: [email protected]; [email protected]
Subject: Re: [Elecraft] On zero beating

Now there's a really cool idea!!! I second the motion. 73/Tim

Quoting Steve Lawrence <[email protected]>:

> <snip>

> Perhaps the "ultimate" spotting tool would be to measure the audio=20
> frequency of a received CW signal and display it -- perhaps at the =
touch
>=20
> of a button.  Knowing your sidetone is set to, say 700Hz, you could =
then
>=20
> adjust the dial frequency so the received CW signal is also at 700 Hz.
>=20
> Since the K2 has a frequency counter logic, perhaps this feature could
> be=20
> implemented?
>=20
> Steve
> aa8af
>=20
<snip>=20