> 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: [email protected] > [mailto:[email protected]] On Behalf Of OE5CSP-Chris > Sent: Saturday, June 06, 2009 2:48 AM > To: [email protected] > 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 -- View this message in context: http://n2.nabble.com/BHI-HP-200--and-other-headphones-tp2792291p3034501.html Sent from the Elecraft mailing list archive at Nabble.com. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
