[Elecraft] BHI HP-200 and other headphones

[OE5CSP-Chris]

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 ,Mike and the rest of the gang,


I´ve tried various headphones with my K2 and K3:

Vivanco TV 60: My favourite headphones for the K2! No hiss, nice audio  and
lightweight.
Use it sometimes with the K3 but there is some hiss, not much but audible.

Yaesu Fh-77STH: I really like them, very comfortable, lightweight and very
nice audio, but the K3 adds hiss, not much but also audible.

Kenwood HS -6: Good headphones for the K3, no hiss, good sound but only mono
plug; earpads easily worn out.

Koss HP/1 : Got them today from a silent key-very lightweight, nice audio
and no hiss on the K3 or K2.

No name computer headphones-various types : Useful for the K2 and K3, but
not good for communication purposes, no hiss on both rigs.

Sennheiser HD 410: Very useful for the low bands, takes away annoying white
noise, comfortable but only mono plug; good quality and nice audio. Don´t
use them with the K2-they take away too much noise and the K2 is very quiet.

73, Chris 



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