[Milsurplus] Fwd: Re: LM/BC-221 stability

[mac]

Only WW2 airborne radio office I ever had a chance to talk to flew in  
B-25s and he reported that he NEVER used the BC-375, only the command  
radios.  Have also heard reports that in the B-17s and B-24s the -375s  
were normally only used for a short , one time "mission completed"  
report after the bombs had been dropped.  I suspect tuning and  
adjustment of the radios was done almost exclusively on the ground  
before the mission and only rarely in the air after takeoff.  (Also,  
imagine trying to use a BC-221 at 30K ft. with heavy gloves on.)  One  
exception might be if an aircraft was diverted to a rescue or other  
maritime mission which would require re-tuning down in the MF range.

My 2-cents worth anyway.....

Dennis D.  W7QHO
Glendale, CA

************
On Jan 8, 2014, at 6:18 PM, Bruce Gentry wrote:

>
>
> -------- Original Message --------
> Subject: 	Re: [Milsurplus] LM/BC-221 stability
> Date: 	Tue, 07 Jan 2014 08:43:05 -0500
> From: 	Bruce Gentry <ka2ivy at verizon.net>
> To: 	David Stinson <arc5 at ix.netcom.com>
>
>
>
> This discussion of BC-221s has caused a question to arise regarding
> their use on bombers. Did each radio operator set up the BC-375 with
> their own BC-221, or did one plane do so and all the others  "spot"
> him?  How about the drift of BC-375s, did the home base send a short
> message frequently so the radio operator could zero beat it and be on
> exact frequency for their reply?  Did each bomber make a report, or  
> did
> one or two report for them all?   What happened if the mission  
> required
> total radio silence both ways until it was time to report results.   
> Was
> the BC-221 and BC-375 accurate enough to be on frequency?  This  
> would be
> far more important for CW than AM,  it is unlikely the inaccuracy  
> would
> be a problem on AM for a broad receiver. I have never met a veteran  
> WW2
> airborne radio operator to ask these questions, I wonder how many are
> still left?...  :(
>
>      Bruce Gentry   KA2IVY
>
> On 1/7/14 7:55 AM, David Stinson wrote:
>> LMs that I've seen usually need a lot of the oil-filled caps  
>> replaced.
>> If you have one, like a bypass, on any of the voltage busses
>> and it's leaking, it can pull the oscillator regardless of the power
>> supply regulation.
>> Some of them a real bear to replace.
>>
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