[1000mp] cw zero-beat indicator

[Ib Holst Jorgensen]

Hallo
I find it much easier to activate the spot function and
then with the main dial tune the received cw signal untill
it is zero-beating with the spot tone.
You will find that the same tone is then heard in lsb/cw or
usb/cw.
73/Ib oz9dr

On Sat, 09 Mar 2002 01:39:04 -0800, you wrote:

>Hi Mac,
>
>I have found an easy way of tuning in CW signals on the MkV so that I=20
>can hit the 60 Hz APF button and they're in the passband without=20
>labouriously centering them in the 240 and 120 first.  The method makes=20
>getting then into 250 Hz filter very easy by comparison (4 times=20
>easier?).  Here it is, although not as complete as I would like.
>
>1.  Someone on the reflector described changing the cw offset in one of=20
>the menu items so that no matter whether you are on CW LSB or CW USB the=
=20
>frequency readout is the same when you have a cw sig tuned in.  i.e. if,=
=20
>while listening to a sig on cw usb and you push the cw button once to=20
>switch to cw lsb, the sig doesn't vanish and you don't have to tune a=20
>couple of kHz to find it.  I followed the suggestion and am glad I did.=20
> So, the method I am about to describe depends on having made this menu=20
>change.  Sure wish I could tell you which menu item it was and what to=20
>change it to, but I can't.  Let's hope someone can tell us.
>
>2.  Having made the change described in 1, here's how to centre a cw sig=
=20
>in the passband.  Tune in the sig and listen to the note.  Hit the cw=20
>button once to change from cw usb to cw lsb (or maybe it's the other way=
=20
>around).  The lsb button will blink for a moment.  The cw sig note=20
>(audio frequency) will probably be different.  Retune so it is closer to=
=20
>the note you heard before.  You want to split the difference.  Now hit=20
>the cw button again and the usb button will blink for a moment.  The=20
>note should be closer to what you heard a moment ago.  Retune so it is=20
>closer yet.  Keep hitting the cw button and retuning until the two notes=
=20
>are really close to being the same.  Eventually, no matter how many=20
>times you hit the cw button to change from usb to lsb and back again,=20
>the note won't change.  Hit the 60 Hz button and there's the sig.  Well,=
=20
>you don't have to make the two notes the same, just no more than 60 Hz=20
>apart.  Only takes 2 or 3 iterations.  Works just fb on sigs you can=20
>barely hear.  Also, you don't lose the sig while you're doing it.
>
>This works faster for me than going through the tune to 240, then to=20
>120, then to 60 route.  Others can do this instantly by ear.  No doubt=20
>they can also copy RTTY in their heads.  (In 1958 I heard a, probably=20
>apocryphal, story about a USAF lieutenant who could actually do this=20
>and, no, his name wasn't McElroy.)
>
>Hope this helps.  Of course it won't unless someone tells us how to do=20
>step 1.
>
>73 de Jim Smith    VE7FO
>
>
>
>
>J. Mc Laughlin wrote:
>
>>I have no doubt that most people would/do gain little value or utility
>>from the indicator.  I find it to have some value as I have a problem
>>with being able to identify the pitch corresponding to the center of =
the
>>passband.  Watching the indicator helps me center a CW signal prior to
>>inserting the 250 Hz filters.  I can whistle in tune, but I can not =
sing
>>in tune.
>>    ....additionally:  I prefer a lower pitch than the "stock" 700 Hz.
>>I have found that the indicator on my MkV is not able to be adjusted to
>>much below 600 Hz.  So I have adjusted the little-pot-under-the-lid to
>>its lowest pitch and then lowered the centered pitch to be a bit below
>>that.
>>    In short:  I get some value from the indicator while I find the dsp
>>settings to be without value at all.  Everyone is different.    73   =
Mac
>>N8TT
>>
>
>
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