[ARC5] ARC5 CW Question

[WA5CAB--- via ARC5]

If the receiver that you are listening to is on the same frequency, then 
probably you would hear the transmitter when you keyed it.  But why fix 
something that isn't broken?

On K52, your concerns are apparently not warranted.  Buried somewhere in my 
main storage building is a case of NOS K-52's.  I got them sometime in the 
mid 80's.  The reason that I have no idea where they are is that in pushing 
30 years, no one ever wrote either me or one of these lists saying that they 
needed one.  K52 is quite different from the little receiver sidetone and 
transmitter select relays.  As to why not key the oscillator, I can think of 
several reasons why keying the B+ was the simplest solution.

Robert Downs - Houston
wa5cab dot com (Web Store)
MVPA 9480

In a message dated 06/23/2014 17:02:13 PM Central Daylight Time, 
arc5 at mailman.qth.net writes: 
> I believe those receiver relays only served to put the side tone from the 
> MD7 into the headphones. Is that really necessary if there is some 
> crosstalk from the antenna relay?  I assumed the tx tone should be audible if the 
> BFO is on in receiver.?
> 
> I am still wondering about  contact failure of K52  since they are keying 
> ALL of the Tx B+ through K52 in the MD7.
> Any guesses as to why they did it this way? Why not just key the 
> oscillator?
>