[Drake] More TR7A Questions

[Garey Barrell]

Chuck -

I was waiting for one of our TR-7 experts to reply, and then I realized what list this is.  It's 
essentially DEAD, perhaps a dozen posts/ month.

You'd have much better response from these.

DrakeRadio at yahoo.com  (100 - 200 posts/month)

Drakelist at zerobeat.net  (100 - 200 posts/month)

In the older 4 Line transmitters, in order to generate REAL CW instead of merely inserting an audio 
tone into an SSB transmitter, the Balanced Modulator is unbalanced and the Carrier Oscillator is 
shifted ~800 Hz to move it to within the passband of the LSB filter.

The TR-7 does something similar, and shifts the Carrier about 800 Hz by selecting another crystal 
oscillator.  This offsetting is also sold as a way for two transceivers to communicate without RIT, 
and precludes retuning after each transmission, and 'chasing each other up (or down) the band'.

What is the alignment question you have?

73, Garey - K4OAH
Glen Allen, VA

Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
<www.k4oah.com>


Chuck wrote:
> I suspect my problem with "my TR7A is slightly off frequency in xmit."
> is because I don't understand the cw offset scheme.
> Can anyone explain it?
> Also I found a reference to a problem in the service manual with the if
> alignment procedure
> but, was unable to find an explanation of the correct procedure.
> Tnx es 73,
> Chuck
>