[Boatanchors] Fwd: LM-13 Frequency Meter

[Ray, W4BYG]

All this dialog on frequency meters caused me to go down in the basement to
dig out mine, after being stored for many years and review what I had.  It's
a BC-221-AT, including internal AC supply, in fairly nice condition.  It
hasn't been turned it on in a long time but I think will check the filter
caps, put it on the variable AC bench supply and see if it still works.

I looked in my files and found a good complete copy of the WAR Department
manual TM 11-300, printed July, 1944.  This covers all similar series from
SCR-211-A and BC-221-A models to AL.

I wonder if there are various caps, etc., which are known to be prone to go
bad over time, that should be replaced?

Also, is there any interest or need to scan the 150 page manual and posting
it in the files section, or is a scan available elsewhere for others to use?

Ray, W4BYG 

Kindness is the inability to remain at ease in the presence of another
person who is ill at ease, the inability to remain comfortable in the
presence of another who is uncomfortable, the inability to have peace of
mind when one's neighbor is troubled...     Samuel Holdenson 


-----Original Message-----
From: Boatanchors [mailto:boatanchors-bounces at mailman.qth.net] On Behalf Of
howard holden
Sent: Wednesday, July 23, 2014 3:33 PM
To: boatanchors at mailman.qth.net
Subject: [Boatanchors] Fwd: LM-13 Frequency Meter



Sent from my iPhone

Begin forwarded message:

> From: howard holden <holden7471 at msn.com>
> Date: July 23, 2014, 12:32:00 PM PDT
> To: Glen Zook <gzook at yahoo.com>
> Subject: Re: [Boatanchors] LM-13 Frequency Meter
> 
> My LM-18 does fine on 170v regulated, cool and little drift after warmup.
Also someone mentioned the power connections, a female bullet connector fits
nice over the pins on the LM. Available at RS, Homedepot, etc. 
> 
> Great little tool. For frequency calibration signals, measuring a 
> freq, monitoring ones own signal or even as a low sensitivity wide 
> band RX. I've copied local 80m CW signals with just a few feet of wire 
> (of course that meant I was radiating a signal also!)
> 
> And even with a home-constructed calibration chart it's accurate enough
for any work I would do. Once got the W1AW freq measuring test at an error
of just 47Hz.
> 
> Howie WB2AWQ/7
> 
> Sent from my iPhone
> 
> On Jul 23, 2014, at 11:47 AM, "Glen Zook via Boatanchors"
<boatanchors at mailman.qth.net> wrote:
> 
>> I run my LM-7 at 120 VDC and it works fine.
>> 
>> Glen, K9STH
>> 
>> 
>> Website:  http://k9sth.com
>> 
>> 
>> On Wednesday, July 23, 2014 10:59 AM, WA5CAB--- via Boatanchors
<boatanchors at mailman.qth.net> wrote:
>> 
>> 
>> 
>> There is a lot of disinformation on the Internet.  The LM model 
>> numbers actually ran up to LM-21.  If the guy who posted that there 
>> were only 14 models had just read his own NAVAER, he would have known
that it went up to LM-19.
>> 
>> The B-battery was 180 VDC.  So 150 VDC should work as it would 
>> represent a partially discharged but still working battery pack.  But 
>> as I wrote earlier, 300 is also OK because the units will accept up to
475.
>> 
>> Robert Downs - Houston
>> wa5cab dot com (Web Store)
>> MVPA 9480
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