[HBR] HBR most wanted parts BFO coil

[B Smith]

BFO- - - - - -I have never seen the  BC-453/R-23 
BFO coils utilized in  an actual HBR  BFO circuit 
as published, anyone that has actual "construction 
and testing" info utilizing the  unmodified BFO 
coil in a working HBR receiver as published 
please forward it to me and I will post it. 
No theories please, just actual working and tested 
circuits only.       :-)
I have "tested" the BC-453 coil in a Colpitts 
oscillator circuit by just using one winding and 
removing caps and it works fine, remarks at:
http://k4che.com/HBR/BFO%20Coil%20Page%201and%20photos/BFO%20Coil%20Page%20%201.htm

Coil Forms - - - -  I have made my own home brew 
coils using "sink drain repair kit" PVC  and 
discarded tube bases, the repair kit PVC is the 
same diameter as the original coils so W6TC's 
orginial winding instructions will suffice , In 
addition home brewing your own coils will allow 
you to construct a "longer" coil form for 160 
meter coils which I have built and tested. 
Pictures  of the 160 meter coils available on 
request as I have not posted the info yet.


73
breck k4che
--------------------------------------------------
From: "Walt Hutchens" <waltah at earthlink.net>
Sent: Tuesday, April 26, 2011 11:59 AM
To: "HBR Receiver List" <hbr at mailman.qth.net>
Subject: Re: [HBR] HBR most wanted parts

> Ken wrote:
>
>> What are the "most wanted" parts for HBR's?
>>
>> It looks like the IF cans are tough to find.
>>
>> What else is on the Most Wanted list?
>
> That 100 kcs BFO can forshrure.  However the 100 
> kcs IFTs and BFO coils
> can be substituted with the 85 kcs units from 
> the BC 453 or R-23
> command receivers.
>
> Coil forms!  You can 'roll your own' (1" nominal 
> Sch. 20 PVC pipe on
> the base from a metal octal tube works well) but 
> if you want 'original'
> then you've got a search on your hands --  
> especially for the
> polystyrene forms.  'Original' forms are 
> probably the hardest item to
> locate.
>
> The APC-type caps for the coils aren't common 
> anymore but you can find
> enough if you haunt hamfests and eBay for a year 
> or two.
>
> I'd put a high quality tuning cap near the top 
> of the list.  You can
> use the three-gang units from the old FM 
> receivers (also found in many
> ham sets of the 60's-70's) but these have 
> aluminum plates (rather than
> brass) and aren't likely to be quite as stable. 
> In addition many of
> them were cheaply made to start with and quality 
> is highly variable:
> Most stators are misaligned (to the rotor) and 
> it's not rare to find
> one that is loose; Heaven help you if you use 
> that section for the
> local oscillator without fixing it.
>
> No such list would be complete without The Dial. 
> New or even good used
> two-speed drives (necessary if you want to be 
> able to tune SSB signals)
> are hard to find -- these wear out and most of 
> the ones in parts set
> ARE.  The Eddystone 898 dial is probably the 
> best all-round dial used
> on these sets (metalwork is difficult ...) but 
> they're 'occasional'
> items on eBay.
>
> Pretty much everything else I can think of is 
> non-critical and easily
> available modern parts can be used -- indeed, 
> for the small stuff,
> modern parts are far better.
>
> Mileage varies depending on your driving 
> practices and conditions ...
>
> Walt
> KJ4KV
>
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