[Heathkit] HR-1680 Dead Band

[K5MYJ]

There is a coil for each crystal in the HR-1680.

The first step would be to try the adjustment instructions in the manual.

Bob Macklin
K5MYJ
Seattle, Wa.
"Real Radios Glow In The Dark"

----- Original Message ----- 
From: "Bwana Bob" <wb2vuf at verizon.net>
To: <ka4inm at gmail.com>; "H" <heathkit at mailman.qth.net>
Sent: Wednesday, April 13, 2016 6:38 PM
Subject: Re: [Heathkit] HR-1680 Dead Band


> That is a possibility. I don't remember if there are adjustable tuned 
> circuits in the oscillator circuits  in the HR-1680.  You might also 
> check for cold solder joints on the crystal pins. I have had 
> low-activity crystals come back to life by heating the pins with a 
> soldering iron.
> 
>                     73,
> 
>                     Bob WB2VUF
> 
> On 4/13/2016 9:39 AM, Ron Youvan wrote:
>> Jonathan WS1K Jesse wrote:
>>
>>> Thanks to all who replied on and off the list.
>>> The previous owner did disclose that 15 meters would work for a short
>>> time and then fail.  He added that it sometimes would come back off 
>>> and on.
>>> I did check all of the other bands and the crystals are oscillating.
>>> I put a request in to International Crystal for a quote.  There is a
>>> seller on Ebay who does have the needed crystal.  I'm just a little
>>> leery of getting another old crystal having the same problem of not
>>> wanting to do it's job.  That's kind of why I was looking for a fix to
>>> get the stubborn old one to oscillate, providing it's not wasted.
>>
>>   It is possible that the tuned circuit in the oscillator circuit for
>> the 15 meter band is improperly tuned whether it has a tuning control
>> or not.  Crystals tend to fail and stay failed, so other possibilities 
>> need examined.
> 
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