[Hammarlund] HQ-129x recap

[Carl]

The aluminum cover pulls right off with a little bit of muscle power Bill.

Carl
KM1H


----- Original Message ----- 
From: "Bill Cotter" <n4lg at qx.net>
To: "Carl" <km1h at jeremy.mv.com>
Cc: <hammarlund at mailman.qth.net>
Sent: Thursday, August 11, 2011 9:42 PM
Subject: Re: [Hammarlund] HQ-129x recap


> Carl,
> 
> Is there a practical way to replace the caps under the BFO can 
> without having to unsolder the many leads coming out of the can? I 
> could not see an easy way to remove the can because of the switch 
> and variable cap.
> 
> 73 Bill N4LG
> 
> 
> 
> 
> At 09:54 AM 8/11/2011, Carl wrote:
>>Did you get the caps under the BFO cover? Many miss those.
>>
>>Check the banspread cap runout, it may not be perfectly centered 
>>or someone
>>messed with the rotor plates.
>>
>>Carl
>>KM1H
>>
>>
>>----- Original Message -----
>>From: "William A Kulze" <wak9 at cornell.edu>
>>To: "Robert Moses" <rhmoses at earthlink.net>; 
>><hammarlund at mailman.qth.net>
>>Sent: Thursday, August 11, 2011 9:01 AM
>>Subject: Re: [Hammarlund] HQ-129x recap
>>
>>
>> > Well, the recap is done and I went through the alignment, doing 
>> the IF
>> > according to the 'basic' instructions I the HQ-120 manual. 
>> Seems to be
>> > pretty good for not doing the sweep method. I've got a couple 
>> of spectrum
>> > analyzer modules that plug into a Tek 464, they only cover up 
>> to a Mhz or
>> > two, but it definitely covers audio and IF freqs. I'll try that 
>> at some
>> > point. The audio is nice and crisp, especially on SSB. I'm 
>> surprised at
>> > the stability, after a good warm up. I was listening to some 
>> 75m nets and
>> > only occasionally had to give the bandspread knob a little 
>> tweak. Sounded
>> > real good on the AM net on 3880. I have noticed that there is some
>> > nonlinearity across the dial, though. Both ends are right on, 
>> but as you
>> > approach middle of the dial there is an increasing offset where 
>> the actual
>> > freq is a bit below what the dial is tuned to as you get to the 
>> center of
>> > the dial. Maybe I'll take some readings through the bands and 
>> chart it.
>> > I'm considering replacing the resistors. Some o
>> > f them have already been replaced but some of the old ones are 
>> off and one
>> > broke as I was desoldering it in order to do one of the caps.
>> >
>> > This was my first total recap. I've done onesie twosie 
>> replacements, but
>> > not the whole rig. I'm gonna have to stock up on some caps, 
>> most all of
>> > the boatanchors I have are probably only in need of this and a 
>> good
>> > alignment.
>> >
>> > Sure is nice to use the radio and leave it on for a while 
>> without having
>> > to worry about it suddenly crapping out.
>> >
>> > Thanks for the input, guys!
>> >
>> > 73 de Bill W2NVD
>> >
>> > -----Original Message-----
>> > From: Robert Moses [mailto:rhmoses at earthlink.net]
>> > Subject: Re: [Hammarlund] HQ-129x recap
>> >
>> > 2 things to consider: 1: the specs on electrolytics are not 
>> that tight.
>> > 2. If you are worried about inrush current at startup then put 
>> a low
>> > resistance resistor in series with the cap.
>> >
>> > William A Kulze wrote:
>> >
>> >>Back in Jan I picked up an early model(red letter) 129x and 
>> have begun a
>> >>recap. Someone previously had done a partial job of it. The can
>> >>electrolytic was 3 sections of 20mf, 2 at 250V and one at 25V, 
>> with a
>> >>separate 8mf/250V cap for one of the 10mf sections. My question 
>> is, is
>> >>having 20mf of filtering ok on this instead of the 10mf? I've 
>> heard some
>> >>things of over filtering and that some issues can arise concerning
>> >>charge/discharge times and in-rush current at power up. I can 
>> get the 10mf
>> >>caps if I need to, but I'd like to know what problems can come 
>> up with
>> >>20mf instead.
>> >>
>> >>Thanks,
>> >>Bill Kulze
>> >>W2NVD
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> 
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