[Icom] Audio Muting

[George, W5YR]

Rick, I do not know the proper answer to your question as I have not seen
the schematics of the 706 or 746, but it is customary with all good designs
to anticipate that headphones will not always be plugged in and to provide
a suitable termination resistor within the radio.

I would not be concerned about it . . . if it were a hard and fast
requirement, I feel certain that the manual would stress this.

73/72/oo, George W5YR - the Yellow Rose of Texas         
Fairview, TX 30 mi NE of Dallas in Collin county EM13qe   
Amateur Radio W5YR, in the 56th year and it just keeps getting better!
QRP-L 1373 NETXQRP 6 SOC 262 COG 8 FPQRP 404 TEN-X 11771 I-LINK 11735
Icom IC-756PRO #02121  Kachina 505 DSP  #91900556  Icom IC-765 #02437

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Rick Robinson wrote:
> 
> There are times when I want to use my headset(HS706) with my 746 and my
> 706MKIIG with all other audio muted except in the headset. If I put a
> plug in the headphone jack of either radio this takes care of what I
> want to do but leaves me with the question of the open condition of the
> headphone line. Something tells me that I should terminate a plug with
> the resistance of the headphone output. The service manual on the 706
> lists the headphone imp. as 8 ohm and I cannot find the headphone imp.
> of the 746 but the speaker is 8 ohm. If I do need to terminate the plug
> what type of resistor do I use? Any other suggestions and comments would
> be greatly appreciated. Tks, Rick