[Premium-Rx] 600 Ohm Line Matching & Audio

[Craig S McCartney]

Blair,
 
The HP-353A is part of the HP 3550A Carrier Test Set, aka AN/USM-181 Telephone Test Set.  There are several manuals, as I recall they are available on LOGSA.
 
Craig

   _____  

From: premium-rx-bounces at ml.skirrow.org [mailto:premium-rx-bounces at ml.skirrow.org] On Behalf Of Blair Batty
Sent: Monday, July 10, 2006 8:45 AM
To: premium-rx at ml.skirrow.org
Subject: [Premium-Rx] 600 Ohm Line Matching & Audio


Hi Guys:

1) A this weekend's Hamfest, for $20, I bought a 600 ohm HP-353A
Patch Panel and matching rms voltmeter (0.001 to 300 vac, it also  reads
dB's -60 to +50: 1mw at 600 ohms).

The Patch panel did impedance matching in telco lines as well as has
an 100 dB variable attenuator and other things. Apparently there is a 
matching "tone'r" for the far end of the line. So there is another 600 ohm item.

Should anyone know where I can download manuals, I'd be grateful.
Or if anyone is familiar with this stuff and can tell me about it,
please reply privately. Photo here:

HYPERLINK "http://www.ontariorocks.ca/temp/HP-353A.jpg"http://www.ontariorocks.ca/temp/HP-353A.jpg

2) I use some audio accessories for multiple radios.

   a)  I use a Roland M-160 mixer with
16 channels of balanced inputs, stereo out. No longer in production,
this $1,000 item can usually be eBayed for about $100. It can mix
audio from 16 radios; rack mount. It also have a bunch of independent
sends and receives, for tape recorder, audio filters and processing, etc.

   b) Nady HPA-4 four channel headphone amplifier, rack mount., new $100.
This allows you to have four headphones w/ separate volume controls, 
either/or four line level outputs. And each output can independently choose
between four independent stereo inputs. Everything isolated and separately
amplified. 

For me, one input goes to the  M-160 mixer out, and another input to
an FM broadcast receiver.
Outputs go to  1) a pair of powered speakers, 2) headphones, 3) second
headphones 4) computer audio in, audio filter, etc.  Photo:

HYPERLINK "http://www.ontariorocks.ca/temp/Audio-out.jpg"http://www.ontariorocks.ca/temp/Audio-out.jpg

3) Stereo Graphic equalizer, as a crude noise filter.

Most commercial audio gear (rock band) is of very high quality,
though used gear can be beaten to death...

Sincerely
/b 


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