From: "Ken, WA2LBI" 
Subject: Re: [drakelist] T-4XC Off Frequency with an R-4B


"Ken, WA2LBI"  made an utterence to
the drakelist gang
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Dave,

I recently repaired a R-4B and T-4XB with a similar problem.  The 5595 Kc
oscillator in the second mixer, V3 (12BE6), would not make frequency no matter
where C61 was adjusted.  I removed C155, a cap value selected during
production, and that brought it within range of C61.  It worked fine once the
freq was set.

Ken, WA2LBI



Quoting David Havel :

> Hi folks,
>
> I recently acquired a C Line, and have sent the R-4C off for upgrading.
> Upon performing an alignment on the T-4XC, and trying it out with my R-4B
> receiver, it appears to be transmitting about 700 Hz lower than the display
> shows on both the R-4B or the xmtr. itself.  This is regardless of whether
> the rcvr. or the xmtr. is controlling the frequency.  It did work very good
> with the R-4C, so I don't know if I messed up something during the
> alignment, or if the Carrier Oscillator connection to the R-4C locked it in
> to where it should be.
>
> I checked the Carrier Oscillator frequency by connecting it to the counter
> of my TR7, and it is right on 5645 KHz via C6.  I believe I performed the
> alignment okay per the manual, although the Carrier Oscillator, Filter
> Match, and Balanced Modulator adjustments were performed while watching the
> S meter on my TR7, since the S Meter isn't responsive enough to notice the
> change as in plate current as described.  I am having some trouble getting
> any canary chirping sound with the R-4B while attempting the transceive
> alignment.  I'm getting a steady tone of around 800 or so Hz that rises or
> lowers with the adjustment of C-61 in the R-4B.
>
> Any ideas as to what might be happening here?
>
> Thank you in advance for any suggestions to try!
>
> 73,
> Dave - NO3K
>

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