[Hammarlund] HQ-110 alignment - the "visual" alignment method.

[Kenneth G. Gordon]

On 7 Apr 2006 at 10:36, RJ Mattson wrote:

> Hi all,
> I use a Wavetek 134  sweep generator. range: 20hz to 2 MHz. Beware -
> Not many TV service sweep generators available will cover the low IF
> frequencies of comm rcvrs.

Absolutely correct! My B&K covers from 10 Hz to 1 Mhz and is good for 
455 Khz IFs and lower. I will need to get one that goes higher, up to 10 
Mhz for the other receivers I need to do.

> The Wavetek has a variable sweep time and
> at the moment I am adjusting a 1650 kHz two xtal IF stage in my
> homebrew rcvr. The sweep range is set to 1s to 100ms and I always
> lower the sweep until it is just bearable to watch the fading
> phosphors plot the bandpass on the scope.

Same here.

> A nice function is to have
> freq markers so you know where you are and you can calc bandwidth.

Yes, I would love to have that, but have not yet implemented it.

> I
> could never get markers to show up until I built myself a glowbug 6SN7
> post marker generator attachment.

If you have that documented, I would really like to have at least a 
schematic of it so I could build one for my shop. Could you do that, 
please? Perhaps you could send it to me and I could post it to the 
Glowbugs website?

> Now I can see pips on the bandpass
> waveform injected from my signal generator or xtal calibrator. The
> Hammarlund HQ-120x and 129x etc are just impossible to align without
> sweeping the IF.

Again, absolutely correct.

> I would attach an URL to show my setup but then the
> post would never make it to this reflector.

Some reflectors have spam filters that prevent that. If you could send 
that to me off list, perhaps I could post it to the Glowbugs website also.

> Anyone else have this
> problem or know what my problem is?

Yes. As above. I think Al Waller's setup filters all e-mails that contain 
URLs, but am not sure. I know the Glowbugs reflectors does not, since I 
am the SYSAD for that machine.

Ken Gordon W7EKB