[CW] Headphones or Loudspeaker?

[Richard Knoppow]

     I found the resonance of Trimm phones varies. The 
Commericals I use are around 800hz but the Featherweights are 
closer to 1200. Not sure what affects this. I've tried swapping 
diaphragms with no change. The old Western Electric 509W phones 
are pretty consistent at 1000 hz but are heavy. About the 
heaviest are the old Baldwin phones. They are balanced armature 
with mica diaphragms and a lot of iron in them. They are also 
resonant at about 1000hz. I prefer a lower tone and when using a 
speaker set it to probably somewhere around 700 hz.
     I think the old spark transmitters were around 500 hz.

On 6/14/2018 5:58 PM, D.J.J. Ring, Jr. wrote:
> I use Trimm Commercial headsets, I don't particularly like the 
> high tone they resonate at, but it is the frequency I do hear 
> best, and I can definately hear better using them for very weak 
> signals.
> 
> I like speaker so I  can tune to  550 Hz which is a nice low note 
> which is very nice on the ears.  But as soon as QRM shows, I put 
> the speaker tone to 800 Hz.
> 
> 73
> 
> DR
> N1EA


-- 
Richard Knoppow
1oldlens1 at ix.netcom.com
WB6KBL