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Author Topic: Need advice interfacing small audio mixer with TS-520S  (Read 1571 times)
WD9GCO
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Posts: 2




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« on: April 19, 2013, 01:25:39 PM »

I'm getting back on the air after roughly 20 years of inactivity.  I'm going to use something better than the old RadioShack handheld crystal mic that I used when I started, which means something like a Heil through the little mixer on my desk so I have level and EQ control, and then into the 520s.

Only thing is, I'm not sure exactly what's needed to interface the mixer to the rig (aside from a properly-wired cable...).  I know there's a huge impedance mismatch (the mixer is roughly 120 Ohms out, while the 520s is - will a matching xfmr be enough?  I'd like to hear from someone who's done something similar and who has had to deal with the level and impedance mismatch.  Maybe it doesn't really matter.

Thanks es 73.

Paul
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W9GB
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Posts: 2652




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« Reply #1 on: April 20, 2013, 06:13:57 AM »

Quote from: WD9GCO
know there's a huge impedance mismatch (the mixer is roughly 120 Ohms out, while the 520s is - will a matching xfmr be enough?  I'd like to hear from someone who's done something similar and who has had to deal with the level and impedance mismatch.  
Maybe it doesn't really matter.
It matters, for quality audio.

Professional audio technicians deal with Impedance (Z) matching as well as
Balanced and UN-Balanced Inputs / Outputs on a regular basis.
In RF, you deal with Antennas.
At antenna feed-point you use BAL-UN or UN-UN and Z transformation (1:1, 4:1, 9:1).
Coaxial cable is an UN-Balanced transmission line, BUT a Dipole Antenna is a Balanced radiator.


Whether you are working with RF or Audio -- they BOTH follow AC Theory and are both Electromagnetic Waves.
These principles have not change since discovered in 19th century.

Bob Heil explains the basics in Heil's Tips
http://www.heilsound.com/amateur/tips/

Balanced to Unbalanced Wiring
http://www.heilsound.com/amateur/tips/balanced_to_unbalanced.php

All Things Kenwood
Amateur radio transceivers and transmitters use UN-Balanced audio inputs.
The Kenwood Hybrids (TS-520S) desire a High-Z (impedance) input.

http://www.heilsound.com/amateur/dspsettings/all_kenwood.php

Audio Matching (Z in ohms) Transformers
Heil XT-1 High to Low impedance matching transformer, $17 USD.
« Last Edit: April 20, 2013, 06:31:45 AM by W9GB » Logged
W2RKJ
Member

Posts: 55




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« Reply #2 on: April 20, 2013, 02:09:28 PM »

Here's a article I found that solved my problems in one reading. I fought RF for years and this article cleared it up. Pay particular attention to the W2IHY iBox.

http://www.nu9n.com/tx.html
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