[Hallicrafters] Hallicrafters Digest, Vol 76, Issue 7

[james.liles]

Hi Richard:
The VFO adjustments are not very well done in the manual.  The sequence is 
as follows.  Check the crystal calibrator as per the manual --- Set the band 
switch to 3.5 Mc and the dial to 3.5 Mc --- Set the cal pot to center ---  
Set the function switch to LSB; the manual will make you think that it 
should be USB, it's not --- Turn the calibrator on --- Adjust C87 for zero 
beat.  If you centered the cal pot, the RIT should now be centered as well. 
Remember that the heterodyne crystals for the other bands may be slightly 
different than the 80 Meter crystal so the cal pot will have to be adjusted 
to zero the dial.  This will cause the RIT knob to need adjustment in order 
to follow the cal pot adjustment; Thus moving the RIT knob off center. 
Note, once these things are done check the VFO for end to end and 100 kc 
points.  They should be within 3 kc according specs but can easily be 
adjusted spot on.  The end to end adjustment is called out in the manual 
correctly.  Good luck and Kindest regards Jim K9AXN

> Message: 2
> Date: Wed, 5 May 2010 00:40:15 -0400
> From: "Richard Donley" <donley.dn at comcast.net>
> Subject: [Hallicrafters] SR-150 Question
> To: <hallicrafters at mailman.qth.net>
> Message-ID: <169F0DD9D1004A599AB545E21AF84771 at ownerb77866e08>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Tell me if my understanding of the RIT control is as follows:
>
> With the RIT pot knob at 12 o'clock, I should be able to turn the RIT 
> function on and off without changing the receive frequency. Then I should 
> have equal receive frequency adjustment on either side of the 12 o'clock 
> position.
>
> My SR-150 RIT function is not centered. My RIT pot knob has to be at about 
> 9 o'clock to have the receive frequency remain the same with the RIT on or 
> off. This then limits my frequency adjustment to the clockwise position 
> only.
>
> I could find no information in a quick scan of the manual that would 
> indicate how to adjust and correct this problem.
>
> Any help would be appreciated.
>
> Richard
> kc9ub