[ARC5] My military headphones....

[Richard Knoppow]

----- Original Message ----- 
From: "Kenneth G. Gordon" <kgordon2006 at frontier.com>
To: "ARC-5 List" <arc5 at mailman.qth.net>
Sent: Friday, January 02, 2015 11:11 AM
Subject: [ARC5] My military headphones....


> OK. After further "research" it is looking as though my 
> 'phones are either an
> HS-23 or an HS-33 set.
>
> The red PL-354 is on the end of the short cord, and when I 
> use them with my
> FT-890, I get considerably more volume out of them than 
> with my other set
> of phones, which have some sort of ANB-*** type elements, 
> which are,
> obviously, higher impedance.
>
> Therefore, I am more inclined to believe these are the 
> low-impedance
> HS-33s.
>
> I'll measure the DC resistance later today to see what I 
> have. According to
> Mike Hanz' site, they should measure 60 ohms, if they are 
> the 600 ohm
> types. We'll see.
>
> I also hope I am correct when I say that the pads I have 
> been directed to by
> you folks, which are listed as fitting all mil phones, 
> will fit these.
>
> Thanks,
>
> Ken W7EKB
> ______________________________________________________________



    My measured impedance for R-14 phones is 8 K, the DC
resistance is 2K. This is for a pair wired in series.
    HS-16 impedance is 600 ohms, DC resistance is about 100
ohms.
    ANBH-1 and 1A measure the same, about 200 ohms DC and
600 ohms impedance. Again all are for two phones in series.
    The short cord and shorter connector is known as a "bail
out" since it purpose was to prevent the person from being
hung up by the headphone cord if he had to bail out. The
longer part of the cord is sometimes hard to find but I
suspect ebay has lots of them.
    I don't think its possible to send attachments to the
list but I have a PDF of measurements of headphone
impedances and will try sending it. Its only partial and I
must measure more phones and make a better list.

Later note, I tried sending the attachment to the list and 
it was rejected.


--
Richard Knoppow
Los Angeles
WB6KBL
dickburk at ix.netcom.com