[Elecraft] BHI HP-200 and other headphones

[Barry Simpson]

Hi Chris

I am using the YH77STA phones. They are the best phones I have ever used. I
have had them for about ten years.

There is absolutely no hiss or any residual noise with my K3 AF gain at
minimum or any audio hiss at any setting. It suggests that you have an AF
amplifier fault.

Incidentally my FT1000MK5 and my TS2000 are also totally hiss free. However
my IC7000 has considerable hiss as does the FT2000. I don't know about the
big Icoms or their new 7600 and would be interested to hear from anybody who
has one.

73

Barry  VK2BJ

-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of OE5CSP-Chris
Sent: 5 May 2009 14:33
To: elecraft at mailman.qth.net
Subject: Re: [Elecraft] BHI HP-200 and other headphones




Hi Chris,

The K3 headphone amp (National LM4811) is specified at 106dB S/N ratio so
should be pretty noiseless.
Using Sennheiser HD600's here with quite high sensitivity which has no
noticable noise on the K3.
Does the hiss remain with AF gain all the way down?

A quick & dirty way to lower the residual amp noise is a small resistor
network is series with the headphone output. Not so elegant but might save
you from buying yet another headphone...

73'
Paul
PD0PSB


Hi Paul,

The hiss remains even with the AF gain all the way down! The front panel
connector is worse than the rear connector, so I always connect the Yaesu FH
77 STA to the rear connector. Could you please tell me how to build the
series resistor network? 

73, Chris-OE5CSP
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