[Milsurplus] Q5er & BC348
COWARD,JAY
jay.coward at avagotech.com
Tue Jul 4 14:09:25 EDT 2006
Not stupid at all.Sounds like quite a project that had good results and
good engineering.In your youth there was plenty of "surplus":now it's
called "rare piece of history".It's just a time thing.At the end of WWII
aircraft were pushed over the side of carriers returning home in order
to reduce inventory.I'll bet we've all had a few sodas and "cold 807s"
out of recycled B-17s and B-29s and every other US aircraft of the
time.And will continue 'till the end of civilization.
Don't be ashamed of your accomplishments!You are all the better for it.
Jay.
PS the surplus conversion manuals were my bibles and I learned quite a
bit of electronics,system design and construction techniques by
modifying surplus equipment that continue to help me to this day
designing semiconductor test systems.
-----Original Message-----
From: milsurplus-bounces at mailman.qth.net
[mailto:milsurplus-bounces at mailman.qth.net] On Behalf Of WF2U
Sent: Tuesday, July 04, 2006 10:33 AM
To: Unserviceable but Repairable; Milsurplus at mailman.qth.net
Subject: RE: [Milsurplus] Q5er & BC348
In my younger an stupider days, in the mid 60's when there were
s**tloads of
surplus still available and I didn't think of preservation, I did my
share
of surplus hacking.
I modified a few BC-348's into double-conversion receivers thusly:
I took out all the 915 KHz IF cans, except for the first one. I
substituted
the 85KHz IF transformers from the BC-453.
I yanked out all the octal sockets and substituted miniature sockets,
with
the appropriate circuit changes for optimum operating conditions for the
new
tubes. I built a 6BE6 converter stage where the original BFO tube was,
changed the BFO coil frequency to 1000KHZ to convert the 915 KHz first
IF to
85 KHz. I built an audio-derived AGC, a product detector for CW/SSB and
a
diode detector for AM feeding the audio chain, with a 6AQ5 audio output.
I built the power supply into the stripped BC-453 chassis, utilizing the
covers to keep it safe.
After a few of my friends heard my first "masterpiece", I got 3 more
orders
for similar receivers. My buddies (and myself) were very satisfied with
the
performance, until we got "real" receivers... Frankly, these
Frankensteins
worked great!
I'm still a little ashamed of the massacre of perfectly good surplus
equipment...
Now, don't do this at home ;-))
73, Meir WF2U
Landrum, SC
> -----Original Message-----
> From: milsurplus-bounces at mailman.qth.net
> [mailto:milsurplus-bounces at mailman.qth.net]On Behalf Of Unserviceable
> but Repairable
> Sent: Tuesday, July 04, 2006 9:59 AM
> To: Milsurplus at mailman.qth.net
> Subject: Re: [Milsurplus] Q5er & BC348
>
>
> A pal, a GW3 sed he used a BC-453 as a tail-piece on a '348. '348 had
> 915 kc IF. So by using triode sec'n of '453 12K8 as 1000kc osc w.
> LM/'221 xtal pugged into 12SK7 RFA socketn - VOILA, you had the
> adaptation.
>
> 915 pulled right from 6R7 socket on '348 & audio on '453 retained.
>
> Brilliantly simple & non-invasive or...
>
> You cud bandsaw away the '453 tuning cap, etc. Then stove-bolt
> it to a piece of 19" masonite. Put LM/'221 remains to work as
trot-line
> fishing anchor. That'd make for a real nize job.
>
> Heard this 1st-hand 10 yrs back & was surprised @ the elegance. Bet
> this is 1st time for many here.
>
> You know gifted stories like this make me think non-solder-challenged
> ham-hackers had much more goin' than the community today that knows
> the exact right lockwasher family for a AN/APT-69 nitro drum.
>
> Marty
>
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