[Elecraft] BHI HP-200 and other headphones

[Joe Subich, W4TV]

> I found 8 Ohm HP-200 headphones. Is anybody using them? BHI
> says they should work pretty well with the K3, but they have 
> actually never used them with a K3. 

8 Ohm headphones are ... well, 8 Ohm headphones.  The issue of 
hiss with low impedance headphones has been around for quite 
some time with many transceivers.  

Some manufacturers "build out" their headphone outputs by placing 
a 10 to 22 Ohm resistor in series with the headphones to prevent 
hiss with low Z phones.  You are accomplishing the same thing 
with the passive volume control. 

Many of the computer headsets are already higher impedance (32 - 
64 Ohms) ... as are many professional headsets (up to 600 Ohms) 
and the Heil ProSet (200 Ohms).  If I recall correctly, the 
high impedance phones also help with the apparent low frequency 
roll off in the K3 headphone circuit ... 

73, 

   ... Joe, W4TV 
 


> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net
> [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of OE5CSP-Chris
> Sent: Saturday, June 06, 2009 2:48 AM
> To: elecraft at mailman.qth.net
> Subject: Re: [Elecraft] BHI HP-200 and other headphones
> 
> 
> 
> 
> 
> OE5CSP-Chris wrote:
> > 
> > I recently bought Yeasu lightweight headphones for the K3 and found
> > out, that the K3 adds hiss with both the front and rear 
> connectors. I
> > have similar problems with the K2. At the moment I use computer
> > headphones- they work nicely, but are not made for communication 
> > purposes.On the BHI homepage I found 8 Ohm HP-200 headphones. Is 
> > anybody using them? BHI says they should work pretty well 
> with the K3,
> > but they have actually never used them with a K3. I do not want to
> > spend money again on headphones I can´t use with my K3!
> > 
> > 73, Chris-OE5CSP
> > 
> 
> 
> 
> Just give it a try:
> Put a potmeter inline L and R channel and turn them until you
> find the noise acceptable. Sort of like the "passive volume 
> controls" you can find: 
> http://www.scansound.com/xcart/images/P/in-line-volume-control-250.gif
> http://www.itechnews.net/wp-content/uploads/2008/11/zagg-zbuds
-earphones.jpg

If you find the appopriate resistance put that as a fixed resistor inline in the left and right channel.


Theoratically you now have an impedance mismatch but it has allways worked for me.



The scansound product helps-no hiss any more!!!!

73, Chris



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