[TMC] R5007/FRR-502 : Additional Info

[Roy Morgan]

At 11:10 AM 1/23/2005, Tom Brent wrote:
>In June of 2004 there was a lengthy discussion of the FFR and R-5007
>receivers... take a closer look at the 6 receivers and 19 tuning  units I 
>have.


Tom,

Thanks much for the info on the FRR-49 and so on. I have one of these 
receivers (acquired in a flash when it was noticed at the local "dump" and 
the attendant's back was turned.)  I have a modest set of plug-in's and am 
hoping to follow through with Ed Hopton on a trade so we each get one we 
don't yet have.

One modification of the plug-ins was to mount a small shelf on the front to 
allow the use of a plug-in octal type crystal oven.  This increased the 
stability of the receive frequency a lot, no doubt.

With that in mine, my receiver is likely to joint other TMC gear here in 
RTTY service once I get it all set up.  Andy Moorer notes that manual 
tuning is very touchy, especially at higher frequencies, and that image 
rejection terrible.


>..NAVSHIPS 0967-114-2010 manual.

I wonder if this manual is on Andy Moorer's web site: ...
No, but NAVSHIPS 92786 is.
http://www.jamminpower.com/main/R5007.jsp
This file is actually 63 mb in size, (not 6 mb as the page says) and is 
dated 1956.  The title is:

Instruction Book for
Communications Receiver
Model FRR
Receiver Set, Radio
AN/FRR-49(V)

If that NAVSHIPS 0967-114-2010 is available online I'd appareciate knowing 
the link.

Do I remember from somewhere that some of these receivers have a power 
supply meant for some odd line voltage such as 100 or 92???  And that if 
you run it on normal line voltage it might survive but will run hot!

Ah yes here it is in my notes:

>Date: Tue, 15 Jun 2004 20:42:30 -0700
>From: telegrapher at att.net
>To: TMC at mailman.qth.net
>Subject: [TMC] R5002 Reciver
>
>
>Last night i pulled what i had thought was my FRR-49(V) out of the rack
>because it sounded terrible.  Audio was quite muffled and distorted.
>Thought there should be a fix for this.
>
>Looking underneath the chassis i saw that i had previously changed out a
>couple of electrolytic caps as a precaution.  Hmmmm.  Voltages appeared
>to be way high.  ALmost 45 volts high on the plates.  Also some AC on
>the chassis.  WEll better dig into the power supply.
>
>Disconnected the 470 pf and .1ufd caps from each side of the line.  That
>took care of the high AC leakage.  B+ still way high though.  But, the
>audio seems to sound a little better.  Pull out the manual.  There are
>two schematics in there for the FRR style receiver. In looking at the
>power supply i figured i could move the line side tap on the transformer
>and drop the voltage down that way.  Looking in the manual the
>transformers are different.  The one for the R5007 receiver only has
>either a 100V or 220V tap.  Nothing in between.  Also noticed looking
>under the receiver there seems to be a lack of .01 bypass caps.  Wonder
>why?
>
>So what i did for the interim is drop the line voltage down to 100V with
>a variac and then measure the B+.  Aha.  Now its 255V where it should be
>250 and the regulated B+ is 150 as it should be.

(snip...)


Roy






- Roy Morgan, K1LKY since 1959 - Keep 'em Glowing!
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