[heathkit] zero beat

[Alan Beck <becka@eastlink.ca>]

So,

The rx-mod pot allowed you to set your TX up AND use the RF Gain wide
open.

So, that would be what? a fixed Resistor in series and open to
experimentation.? I do have one, I think. I have many 10 watt 1.2K
resistors.

You are right My sigs are loud.

I could use the XTAL calibrator as a reference signal.

All tubes are now NOS except the 6EA8 (2 of).

I have one 6EA8, but it unbalances the RX and causes it to go nuts.

The only real variables are a STBY switch and the contacts on the dowkey
relay. I guess the tube I need is another NOS 6EB8.

I guess I am dreaming up an order.


Best 73

Alan

Deoxit would come in handy too.

On Mon, 2008-26-05 at 20:47 -0400, larry allen wrote:
> My first transmitter was the dx-60, as well, ... my first receiver was the 
> gr-91... general converage receiver...My second receiver was the
> hr-10...My vfo was the hg-10....
> When you are adjusting the rf gain, you are as I recall, in effect, 
> pulling the receiver's tuning slightly...
> I would go the other way... set the rf gain to peak and then adjust the af 
> gain appropriately... If the signal is too strong, pull back on the rf
> gain but once you find the right setting leave it....
> You could also be suffering from a weak tube.... which is allowing the 
> pulling effect...
> 
> It has been a long time since I used my dx-60 hr-10... mid 60's...
> I remember I muted the receiver, gr-91, by installing a potentiometer
> between the cathode of the rf tube and ground and adjusted the control for 
> best reception of a very strong signal.. mine...
> 
> It is quite possible I did the same thing with the hr-10.. modifying the 
> front end to make is so insensitive that it could only hear me.. when I 
> went back to receive the mod was shorted out...
> 
> Larry ve3fxq
> 
> ----- Original Message ----- 
> From: "Alan Beck" <becka@eastlink.ca>
> To: "heathkit List Member" <larya@rogers.com>
> Sent: Monday, May 26, 2008 4:18 PM
> Subject: [heathkit] zero beat
> 
> 
> > OK,
> >
> > I have a question.
> >
> > When I was using my DX-60/HR-10 station, I would call someone and then
> > shift the BFO to match.
> >
> > The reason for this was that I could barely  hear my VFO in the RX.
> >
> > The manual states that to operate the receiver, I have to set the AF to
> > 1/4 and use the RF Gain to adjust volume.
> >
> > However, when I do this, the frequency shifts slightly.
> >
> > When I key down, I really have a lot of signal that it makes a sort of
> > ripping sound and peaks out the meter, one side stronger than the other.
> >
> > So, I go for the peak on the highest side. When I check the small
> > signal, it is way off frequency.
> >
> > Anyone have a bullet proof technique to do this one.
> >
> > BTW, I am using a dow-key relay and muting the RX during full transmit
> > mode.
> >
> > Alan
> >