[ARC5] Navy LM Use

[WA5CAB at cs.com]

I won't quibble about the usefulness of modulation that was available in 
all of the NT-74028 and only three BC-221 models.  But the relative size of 
the equipment isn't perhaps a fair comparison.  All 26 BC-221 models were 
originally dry battery operated.  AFAIK, only two LM models (LM-13 and LM-17) 
were.  And they are about the same size as the BC-221.  Of the balance of LM 
models, about half are AC operated and take up about the same volume as a 
BC-221.  The remainder are DC operated in aircraft off of the aircraft buss for 
LV and off of an associated receiver or transmitter for HV.  These are the 
only LM's that are more compact than most BC-221's.  I say most instead of 
all because the TS-164/AR (a BC-221 variant) is the same size as a DC 
operated LM.

In a message dated 5/23/2013 3:02:16 PM Central Daylight Time, 
kk5f at earthlink.net writes: 
> >Personally I have always preferred the LM series to the BC-221 as
> >it is more compact.
> 
> I also prefer the LM-* series.  The LM-* also has signal modulation as a
> standard selectable function.  The vast majority of SCR-211-* sets do
> not.
> 
> The bulky SCR-211-* package was generally, out of necessity, stowed away
> somewhere near the radio operator position.  The small installed LM-*
> units were shock-mounted near the operating position, ready to use,
> cal book stowed under the set.  That was not practical with the SCR-211-*,
> so that may lead to a false conclusion that the SCR-211-* was utilized
> less commonly in the USAAF than the LM-* was in the USN.
> 
> Mike / KK5F

Robert Downs - Houston
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