[Hammarlund] [Boatanchors] SP-600 alignment problem

[kirklandb at sympatico.ca]

I've found that the "red dot" marks the 0 position for the phasing control.
When recapping a receiver, it is easy enough to remove the can and check
(if necessary mark) the zero position on the capacitor shaft.

> From: DJED1 at aol.com
> Date: Thu, 7 May 2009 15:30:44 -0400
> To: youngbob53 at msn.com; hammarlund at mailman.qth.net
> CC: boatanchors at mailman.qth.net
> Subject: Re: [Hammarlund] [Boatanchors] SP-600 alignment problem
> 
> One thing I have struggled with is how to set/check the phasing control on  
> my SP-600.  The two peaks in the crystal filter may mean that the phasing  
> is not set for a symmetrical passband.  I've tried unsuccessfully up until  
> now to do a swept measurement- I think I need a sweep generator to get a 
> clean  measurement.  So I've fiddled with the setting of the phasing control, 
> then  slowly tuned around to see if the passband is symmetrical.  When I was  
> satisfied, I peaked the generator on the crystal, then did the rest of the  
> alignment.  I also noted that there was a dot of red paint on the phasing  
> shaft, which might imply the zero setting.  You can check that, but I found  
> two marks and I had to fiddle around too select the right one.
> I did all my alignments in manual mode, with a 4 Mc RF input, so  I don't 
> have to clip the generator into the receiver.  Obviously, you want  the radio 
> all warmed up.  I then bring the generator output up just enough  to get a 
> good reading at the audio terminals.  However, I haven't looked  closely to 
> see if my radio performs any better.  Let me know if you  want a check.
> Ed  W2EMN
>  
> **************Big savings on Dell’s most popular laptops. Now starting at 
> $449! 
> (http://pr.atwola.com/promoclk/100126575x1222382499x1201454962/aol?redir=http:%2F%2Fad.doubleclick.net%2Fclk%3B214663472%3B36502367%3Bg)
> ______________________________________________________________
> Hammarlund mailing list
> Home: http://mailman.qth.net/mailman/listinfo/hammarlund
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Hammarlund at mailman.qth.net
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html