[HBR] 85 KHz IFs

Thu Nov 20 11:15:18 EST 2014

Thanks for all the feed back and links : )
Helped me a LOT : )
I'm going to tear abart my little storage
area to hopefully find my 3 ring binder with
notes, and my CD : )
Thanks again guys
73
Bill  KE9XQ


On Thu, Nov 20, 2014 at 9:36 AM, B. Smith wrote:

> Those coils work very well as is. See for info including mounting and 
> alternate mounting schemes.
> 
> http://k4che.com/HBR/IF%20Coil%20Pages%20and%20Photos/IF%20Coil%20Selection.htm
>
> breck k4che
>
> On 11/20/2014 10:08 AM, Peter Bertini wrote:
>> Those IF cans had a very, very narrow tuning range, the trimmer caps 
>> were
>> too small value to have much authority over the IF frequency. You may 
>> want
>> to add some external fixed padders or trimmers to get them exactly on
>> frequency.  The neat feature of those cans is that you can remove 
>> that
>> little black cover, and adjust the coupling between the coils to set 
>> the
>> bandwidth.
>>
>> Some guys have salvaged the mica sockets and male connectors from the 
>> old
>> BC-xxx chassis in order to use the existing mounting system.  You can
>> directly solder to the female terminals on the base of the 
>> transformers,
>> however.
>>
>> Pete
>>
>> On Thu, Nov 20, 2014 at 8:03 AM, Shoppa, Tim <tshoppa at wmata.com> 
>> wrote:
>>
>>> That tube lineup you mention sure sounds like a BC-453.
>>>
>>> Tim N3QE
>>>
>>> Sent from my Windows Phone
>>> ________________________________
>>> From: William Wood<mailto:ke9xq at charter.net>
>>> Sent: 11/19/2014 10:11 PM
>>> To: hbr at mailman.qth.net<mailto:hbr at mailman.qth.net>
>>> Subject: [HBR] 85 KHz IFs
>>>
>>> Greetings Folks
>>>     Traveled a short distance today to pick up my new
>>> 85 KHz Ifs, and a 65 KHz IF if that thing is labeled right.
>>> 2 x 85 and 1 x 65  I wonder what the range will be on each?
>>> 36 miles away, 72 round trip, but the roads were in good
>>> winter driving conditions.  And well worth the little side trip : )
>>> Can't remember what the gent said that they came out of, I
>>> think it was a BC 453???   Do not remember the facts, just
>>> know I'm getting closer to the parts listed that is needed.
>>>
>>>     Have a few shorter cans too, do not know what they are
>>> as of yet, but they came out of the same receiver.
>>>
>>>     Did you guys modify the base, these are female holes
>>> that sit down over pins.  Can't remember how they were
>>> put into action, I guess I need to find that printout : )
>>>
>>>     Now I have to find that schematic again and see
>>> what I needed.  Had a thought today, I have a bunch of
>>> Octals, and was thinking of going the octal route, but I
>>> think I shot that down right away for two reasons.  One is my
>>> lack of technical skills to do all the sub work, and the second is
>>> probably the newer miniature tubes would have better all
>>> around performance.
>>>
>>>     Now that I argued myself out of that idea folks, any ideas
>>> pro or con on the subject???   I like the "older" idea, but
>>> newer idea is better performance...
>>>
>>>     Kees or someone, I know I printed out the book materials
>>> and have it around here 'somewhere' I still would like to get
>>> a copy of the CD again, Happy to pay the ten spot.  I think
>>> I wrote to the other gent that archived the history and offered
>>> to buy his disk too, but still have not heard from him.
>>>
>>>     Think I will go to the archiving sites tonight, and se if I can
>>> at least download the schematic for the HBR 13C so I can
>>> ruminate a bit more on the subject : )
>>>
>>> 73 Everyone
>>> Bill  KE9XQ
>>>
>>> PS  Keep digging, those parts are out there, some of which
>>> might take a couple of years to find, but they are there,
>>> I have faith in our hunting abilities : )
>>>
>>> PSS the tubes that came in the little box were:
>>> 12A6 GT, 12SK7 GT, 12SK7 GT, VT131 (ANOTHER 12SK7)
>>> 12SR7, AND A 12K8.  If that gives anyone a hint as to where
>>> the parts came from.  Cheers
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>
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