[HBR] Believe it or not, I'm Working on the HBR :)

[B. Smith]

I discussed testing the IF coils with a simple jig at:
http://k4che.com/HBR/IF%20Coil%20Pages%20and%20Photos/IF%20Coil%20Selection.htm

I would be interested in other methods .

k4che



On 1/17/2014 6:00 PM, Steve wrote:
> Scott
>
> I am following what you are doing closely so that I can learn how to build
> one of the HBR's myself...I am not as far along as you since I do not have
> the IF figured out yet.   I have the 85Khz ones, they are all the same part
> number too...Not sure if that is good or bad...I have some unknown 265Khz IF
> transformers that I am trying to characterize with the specturm analyzer and
> then modify them for 100Khz.  This is turning out to be more difficult than
> I had thought it might be.  I am interested in CW only so want as narrow a
> bandpass as I can reasonably get...I am not sure what the correct test
> fixture for these might be.  I am using a 22k input resistor and a 100
> resistor across the output of the transformer with no coupling caps.  Does
> the collective wisdom of the group think this is a correct method???  I have
> a nice HP sweep generator and a HP8590 Spectrum Analyzer.  No tracking
> generator but I hope this will work this way..
>
> Steve  NU0P
>
>
> -----Original Message-----
> From: hbr-bounces at mailman.qth.net [mailto:hbr-bounces at mailman.qth.net] On
> Behalf Of whitebear1122 at comcast.net
> Sent: Friday, January 17, 2014 1:02 PM
> To: HBR Receiver List
> Subject: [HBR] Believe it or not, I'm Working on the HBR :)
>
>
>
> I know.  Willl wonders never cease?  With the bulk of my major 3 year  radio
> sell off  in the rear view mirror (sold off 80% of my radios), I'm starting
> back up on the HBR project.
>
>
>
> After vacillating over the past 3 years between building a 17, 16, 11, 12,
> and 13, I've decided to build the HBR-13, not 13C but straight 13.  I read
> about Ted and others efforts with difficulty in getting the IF's to be
> regenerative.  The conclusion by the experts was that the centering of the
> raised RF subchassis changed things and  had "something" to do with it but
> they could never put their finger on the absolute cause.  I have an
> HBR-16 and all three amplifiers easily go into  oscillation on command, and
> I also have an HBR-13C that just doesn't go into oscillation.   I'm going to
> build mine  with the dial offset on the left of the panel like the earlier
> HBR's.
>
>
>
> I never did find the Miller 1730 1800 Kc IF transformers so I've come up
> with two options for the transformer coupled first IF amplifier stage .  I
> found a set of BC-454 1415 Kc IF's plus I'm hoping to take delivery soon of
> a pair of Hallicrafters 1650 Kc IF's.  So I have the 1610 IF amplifier stage
> figured out.
>
>
>
> For the 100 Kc IF's, I have two options as well, as I've been able to find 2
> 1709's and 2 1710's over the past couple of years.  Those 4 transformers
> will cover the 100 Kc IF chain including the back to back first 100 Kc IF
> amp stage.  I also have a set of BC-453 85 Kc IF's that I may use.  I've
> been vacillating the past couple of nights over the 100 Kc IF design,
> wondering if I should make the 2nd 100 Kc IF using back to back transformers
> like the first back to back stage.  Ted Crosby talks about it in his Oct
> 1965 article.  I have enough BC-453 transformers to do the dual back to back
> IF's but not enough 1710 or 1709.  I would need one more 1710 or 1709 to do
> it with the Miller parts.  The BC-453 IF's are huge and those back to back
> IF's take up alof of space.  Hence the vacillating and layout changes .
>
>
>
> I am laying out the mechanical design right now.   I was planning for a 17"
> chassis, then tried for a 14" chassis.  Wow what a tight fit.  I'm back to
> the 17".  I've completed two full chassis mechanical layout drawings  for a
> 14" and a 17" chassis, and darn if last night I decided to try one more.
> I'm trying different layouts to optimize placement depending which and how
> many  1610 Kc IF's and 100 Kc IF's I use, what sized chassis, what size
> cabinet.  Alot of variables.
>
>
>
> The front panel mechanical drawing is complete enough to start drilling the
> chassis front.  Just need to finish up the chassis top layout so I can
> drill, mill, and get building.
>
>
>
> I've got an Eddystone dial that is roughly dimensioned on the front panel
> layout but I won't drill until I complete the rest of the radio and have it
> working.  Then I can lay the clear plexiglass dummy  panel up to the chassis
> and double and triple check the dimensioning.
>
>
>
> So that's where I am at moment.  Wish me luck.
>
>
>
> 73, Scott WA9WFA
>
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