[ARC5] [armyradios] RE: [Milsurplus] BC-348 power

Meir WF2U wf2u at ws19ops.com
Mon Nov 24 16:19:22 EST 2014 

Michael,

 

I don't have any DY-17A for sale.

 

73, Meir WF2U

Landrum, SC

 

 

 

  _____  

From: armyradios at yahoogroups.com [mailto:armyradios at yahoogroups.com] 
Sent: Monday, November 24, 2014 4:02 PM
To: armyradios at yahoogroups.com
Cc: 'John Watkins'; arc5 at mailman.qth.net
Subject: Re: [armyradios] RE: [Milsurplus] BC-348 power

 






Hey Meir,

 

Do you still have that DY-17A for the ZRT-13? If so, how much would you want
for it?

 

Sent from my Verizon Wireless 4G LTE DROID



"'Meir WF2U' wf2u at ws19ops.com [armyradios]" <armyradios at yahoogroups.com>
wrote:

  

John,

I have the schematics for the Russian issue solid-state inverter for the
US-9. The catch is that there are no specifications/data for the
transformer.

Here is another approach for using an existing surplus US military
solid-state inverter module as a substitution for the BC-348/US-9 dynamotor.

Although the original idea came from the R-683/ARR-41 dyno substitution: 
http://staff.salisbury.edu/~rafantini/ARR41modifications.htm , the same
inverter module with the modifications mentioned in the link can be used for
the BC-348/US-9, except the center tap of the high voltage winding of the
transformer shouldn't be grounded. These inverter modules from the ARC-51
UHF surplus transceivers are available from Fair Radio for $25. I tried one
in a BC-348, it works great. No extra RFI filtering is needed. I showed the
setup to someone else in my ham club who needed a dynamotor for his BC-348,
and he used the inverter with very satisfactory results as well. The
inverter footprint fits the BC-348/US-9 dynamotor footprint.

73, Meir WF2U

Landrum, SC 

-----Original Message-----
From: Milsurplus [mailto:milsurplus-bounces at mailman.qth.net] On Behalf Of
John Watkins via Milsurplus
Sent: Sunday, November 23, 2014 4:53 PM
To: Ben Hall
Cc: arc5 at mailman.qth.net; Army Radios; joelroberts001 at comcast.net; Mil
Surplus
Subject: [Milsurplus] BC-348 power

I have a Soviet US-9 ( copy of the BC-348R ) built in 1976 and in flight ops
until around 2005, with a solid state supply replacing the Dynamotor. Also
have the manual and it lists the parts. If anyone wants to build a
replacement for the DM-28 Dynamotor supply, I can hunt up the manual and
post it on the site. I think Meir also has some info on this. It can
directly replace the DM-28 and vice versa. I could also use a base for the
DM-28 for my BC-348Q that I am restoring.

John. WD5ENU

Sent from my iPad

On Nov 23, 2014, at 8:41, Ben Hall <kd5byb at gmail.com> wrote:

> On 11/23/2014 2:50 AM, Joel R Roberts wrote:
>> Greetings everyone, and happy Holidays. I was recently given a BC-348-R
>> that looks to be internally intact, but is of course missing the
>> Dynamotor and Filter assembly, and also the metal case. Does anyone know
>> where I can find the values for the two filter chokes in the assembly?
> 
> Hi Joel,
> 
> Handbook, Maintenance Instructions for Radio Receivers BC-348-X, AN
16-40BC224-3, available for download here:
<http://www.jamminpower.com/main/bc348.html> notes the following:
> 
> Choke 301: RF Choke for Dynamotor
> 
> COIL: r-f choke; 75 turns; #15 AWG enameled; layer wound; wound on maple
or birch form measuring 3/4" long by 1/2" diam; inductance 83 microhenries;
d-c resistance 0.006 ohms; + 5% - 10% ; overall dimensions
> 3/4" length x 1 9/16" diam; mounts by a 1/4" bolt threaded into end of
coil form; solder lug terminal at each end of coil form
> 
> Choke 302: Filter for Dynamotor
> 
> COIL: r-f choke; wood core 1/2" diameter x 5/8" long; 300 turns #30 single
silk enameled wire; universal winding 3/16" thick; d-c resistance 85.5 ohms
+/- 5 ohms; terminal board with 3 terminals 1 3/8" x 1 3/8" by 11/16",
mounting screw through core
> 
> While the second listing doesn't note the inductance, using an air-core
calculator (which isn't quite right for a wood core, but close-nuff I'd
think) says 660 uH.
> 
> In my homebrew dynamotor replacement based on a DM-36 dynamotor with
custom interface plate, I used 220 uH units in both positions and works fine
when installed in the radio.
> 
>> As every one of the complete Dynamotor/Filter assembly's are scarce, and
>> those we occasionally see on the bay are quickly driven out of my price
>> range, similar to the Modulator/Dynamotor sets that a lot of us need, I
>> am going to build up a substitute using the manuals and schematics that
>> I currently have.
> 
> Which is what I have done. :)
> 
> If anyone has an extra case or knows the value of the
>> chokes, let me know. I really appreciate the help. Thanks and 73's to
>> all,,,,,,,Joel KB0FPT
> 
> In the garage, I've got an extra case, stripped chassis, and stripped
front panel (w/o holes). The case is not drilled. I was saving these for
the next BC-348 I might run into...but that was like 5 years ago. Time to
move it along to a new home. Give me a shout off list direct.
> 
> thanks much and 73,
> ben, kd5byb
> 
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