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   Home   Help Search  
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Author Topic: One Microphone, Two Radios  (Read 582 times)
K5TR
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Posts: 387


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« on: July 06, 2009, 12:35:46 PM »

If you do build your own switch you need to make sure
you switch the ground and the hot on the microphone line. You also do not want the ground to be common on the mic line between the two radios - it needs to float
and be switched.  

If you do not do this the chances are very good that you will have hum on one or both radios.

--
George
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George
K5TR
KB3TQS
Member

Posts: 1




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« Reply #1 on: June 27, 2009, 08:58:37 AM »

I have a nice Heil mike that I want to share between by Kenwood TM-D700 VHF/UHF and by IC-718 HF.  I'm looking for a box that will let me switch the mile bertwwn the two and provide pre-amplification for the IC-718
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W6BR
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Posts: 59




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« Reply #2 on: June 27, 2009, 11:38:49 AM »

Check out MFJ - I believe they make a box for exactly what you are looking for!! :-)

73,

Ron, W6BR
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NA0AA
Member

Posts: 1042




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« Reply #3 on: June 27, 2009, 07:05:43 PM »

New Communications Solutions also makes a unit designed to feed up to 4 radios.

Probably a bit pricy, but highly capable.
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WB0MCO
Member

Posts: 81




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« Reply #4 on: June 27, 2009, 09:39:20 PM »

Look for a Icom SM-8 mike, it has the pre-amp built
in with two cables and switch. Plus it will sound
better than any mike that Heil made for Icom
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KB9CRY
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Posts: 4283


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« Reply #5 on: June 28, 2009, 05:11:38 AM »

Go buy a DPDT switch.  That is all you need.
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K4DPK
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Posts: 1077


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« Reply #6 on: July 01, 2009, 06:57:51 PM »

That would be a great project to get you started homebrewing.

All of the parts you need -- wire, connectors, switch and enclosure can be found at hosfeltelectronics.com.

73s and GL

Phil C. Sr.
k4dpk
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KA2UUP
Member

Posts: 388




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« Reply #7 on: July 06, 2009, 11:56:24 AM »

The MFJ-1260, 1261 and 1262 series of products will do what you need.  The 1260 is two mikes to one rig, the 1261 is one mike to two rigs and the 1262 is two mikes to two rigs.  I have the 1262 with Astron and a SM-20 mikes.  Works very well.

Good luck!

Bert @ KA2UUP
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W0FM
Member

Posts: 2056




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« Reply #8 on: July 06, 2009, 12:50:49 PM »

I have the NCS Multi-Switcher and love it, but I also have built my own mic switchs using a discarded computer RS-232 A/B switch boxes and some mic connectors.  Strip out the RS232 connectors on the back and replace with appropriate mic connectors or route short mic cables out the back through rubber grommets.  Really a pretty simple build.  

You could even replace the existing A/B switch in the front panel with a simple DPDT toggle switch as someone suggested to keep it cleaner.

Good luck,

Terry, WØFM
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