[Hammarlund] HQ-100C Alignment

[D C *Mac* Macdonald]

Sometimes, the manufacturer puts some wax inside the coil-forms

with the intent to keep the slugs in place.  If this is the case, a

bit of heat can help to loosen the slug.  A low wattage pencil

type soldering iron that can fit INSIDE the slug for a short time

can help to soften the wax (if present) and aid in removing a slug.

Obviously, great care must be taken when using this procedure!

 

73 - Mac, K2GKK/5

(Since 30 Nov 53)

Oklahoma City, OK

 

 


> Date: Mon, 19 Oct 2009 19:29:11 -0400
> From: cwopr at embarqmail.com
> To: hammarlund at mailman.qth.net
> Subject: [Hammarlund] HQ-100C Alignment
> 
> Good evening all, 
> 
> I am in the process of trying to align a HQ-100C. The IF alignment went ok and with minor adjustments, the IF is on 455kc. Now for the RF. I'm not too sure about this but this is how I interpret the manuals directions: controls set same as with the IF adjustment; the VTVM still hooked to grid of V7 (6AL5) to read a neg. DC voltage; sig. gen. connected to the antenna input. First adj. the HF osc. per Fig. 7, top & bottom slugs adj. for max. at freq. specified. Secondly, make the RF adj. per Fig. 7: top slug adj. for min. at 1.65mc, bottom slug, max. at 1.65mc. Next adj. top slug at 4mc, bottom slug at 10mc...both max. amplitude(?). I assume the 4mc is the one on the 1.6-4mc band and the 10 is the one on the 10-30mc band. Make antenna adj. per Fig. 7. Lastly, the trimmer adj., per Fig. 8, if required. 
> 
> 
> 
> Now comes a problem. On the 10-30mc band, the rcvr is dead from about 11.5mc down to 10mc...no sig. gen. heard in this area. Above 11.5 or so, I can hear the gen., and with the antenna connected, sigs. come thru quite well. Also on the 10-30 band, the dial calib. is way off...over a mc., ie: 12mc dial = 13.516 sig. gen.; 11.5mc dial = 12.968mc sig. gen. This goes on up to 30mc dial = 33.268mc sig. gen. 
> 
> 
> 
> On a whim, I tried to adj. out some of the dial calib. error with the 30mc HF Osc. cylindrical trimmer cap (Fig. 8). The trimmer screw was out about 3/8 inch or so, but with it now all the way in, the dial error decreased slightly and is per the above para. 
> 
> 
> 
> And another woe is that the 10mc RF coil slug (bottom) is stuck. Is there anything safe to spray in the can or is a heat gun about the only 'safe' method to loosen it. Sure hate to have to remove it.  
> 
> 
> 
> Excuse the lengthy and rambling presentation...hopefully, it is understandable. I have some other issues such as the BFO not working right and an addition of the XCU-455 xtal controlled BFO, but this is quite enough for now. Thanks for any help/suggestions. 
> 
> 
> 
> 73 de Bill K4JYS 
> 
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