[Hammarlund] Re: HQ-170 Question (DW Holtman)

[Jay Wicklund]

When I was aligning an HQ170 a few years ago, I had a similar problem.  In my 
case, it turned out that one of the coils was shorted.  Inside the can, the 
enamal insulated wire from one of the terminals pressed against the turns and 
the enamal failed.  Just pulling the crossed wire off the other turn fixed the 
problem.

Jay Wicklund

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>    1. HQ-170 Question (DW Holtman)
>    2. RE: HQ-170 Question (Bob Young)
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> ----------------------------------------------------------------------
> 
> Message: 1
> Date: Sat, 05 May 2007 08:59:47 -0600
> From: DW Holtman <future212 at comcast.net>
> Subject: [Hammarlund] HQ-170 Question
> To: hammarlund at mailman.qth.net
> Message-ID: <463C9BE3.2060609 at comcast.net>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
> 
> Hello,
> 
> First, I would like to thank all of you who responded to my last 
> question about distortion and difficulty in tunning in a SSB signal. It 
> turned out to be the usual, dirty connectors and a very careful alignment.
> 
> Yesterday I did an RF alignment. It went fine except for the following. 
> The 21 MHZ band has very low sensitivity, around 12 uV, using my ear for 
> the lowest discernible signal I could hear (MDS). (20 Meters for example 
> was under 1 uV). The oscillator coil T-25 adjusted the frequency of the 
> oscillator fine. But, the RF coil T-21 has no adjustment. Suspect a bad 
> cap or broken coil wire the Can. Is it possible to remove the cover 
> using the clip device on the bottom of the can without un-soldering the 
> whole thing?
> 
> Also, the sensitivity on 80 meters is not very good and 160 has very bad 
> sensitivity, around 30 uV MDS. On both of these low bands, all 
> adjustments worked as they are suppose to.
> 
> Any thoughts or suggestions would be greatly appreciated.
> 
> Best,
> DW Holtman
> WB7SSN
> 
> 
> 
> 
> 
> ------------------------------
> 
> Message: 2
> Date: Sat, 05 May 2007 11:03:32 -0400
> From: "Bob Young" <youngbob53 at msn.com>
> Subject: RE: [Hammarlund] HQ-170 Question
> To: future212 at comcast.net, hammarlund at mailman.qth.net
> Message-ID: <BAY101-F8ED096BD4A0E9B13722A6C6470 at phx.gbl>
> Content-Type: text/plain; format=flowed
> 
> If the cans are similar to the ones in an HQ-180 and I'm sure they are, it 
> is very difficult to get the covers off without taking the whole can out, in 
> fact I had to replace one that I butchered trying to do just that,
> 
> Bob Young
> Millbury, MA
> KB1OKL
> 
> 
>> From: DW Holtman <future212 at comcast.net>
>> To: hammarlund at mailman.qth.net
>> Subject: [Hammarlund] HQ-170 Question
>> Date: Sat, 05 May 2007 08:59:47 -0600
>>
>> Hello,
>>
>> First, I would like to thank all of you who responded to my last question 
>> about distortion and difficulty in tunning in a SSB signal. It turned out 
>> to be the usual, dirty connectors and a very careful alignment.
>>
>> Yesterday I did an RF alignment. It went fine except for the following. The 
>> 21 MHZ band has very low sensitivity, around 12 uV, using my ear for the 
>> lowest discernible signal I could hear (MDS). (20 Meters for example was 
>> under 1 uV). The oscillator coil T-25 adjusted the frequency of the 
>> oscillator fine. But, the RF coil T-21 has no adjustment. Suspect a bad cap 
>> or broken coil wire the Can. Is it possible to remove the cover using the 
>> clip device on the bottom of the can without un-soldering the whole thing?
>>
>> Also, the sensitivity on 80 meters is not very good and 160 has very bad 
>> sensitivity, around 30 uV MDS. On both of these low bands, all adjustments 
>> worked as they are suppose to.
>>
>> Any thoughts or suggestions would be greatly appreciated.
>>
>> Best,
>> DW Holtman
>> WB7SSN
>>
>>
>>
>> _______________________________________________
>> List Administrator: Duane Fischer W8DBF
>> ** For Assistance: dfischer at usol.com **
>> ----
>> http://mailman.qth.net/mailman/listinfo/hammarlund
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> 
> 
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> End of Hammarlund Digest, Vol 40, Issue 3
> *****************************************
> 
>