Alinco mics compatable with Icom Radios?

[wb9mya]

Sorry to ask what might seem like a stupid question, but
I'm in the process of moving and have some of my gear and manuals in one place and I'm in another. Just got a
735 back from service and was wondering if my Alinco
DX70 mic is compatable with the 735. I realize that Icoms need a little more punch going in than the average radio, but what about the pin configuration?
I'm dying to play with the 735, but only have an Alinco
mic. HELP?http://www.qrz.com/iB_html/non-cgi/emoticons/rock.gif??
73
Evan

[WA7KKP]

Microphones are microphones, in spite of whose name is on them.

If you have a common dynamic microphone, there should be no problem, as long as it is wired correctly. Japanese manufacturers love to use the same connector but wire it differently, to bamboozle the technically inept into buying THEIR own brand.

I've used Shure microphones for years and have had not a lick of trouble.

Gary WA7KKP

[W0JBC]

Read the manuals....

Impedance etc ..


Just part of the ham game ..



JB

[kc4ylv]

Alincos are compatible with Kenwoods, actually.

Shouldn't be tough to rewire it to fit Icom, though - but don't forget you did it, as if you then hook it back up to an Alinco, it'll blow it possibly, due to +V being on the wrong pins.

[K9STH]

Topic moved to the more appropriate forum.

Glen, K9STH
One of the QRZ.com moderators

[WA9SVD]

Many of the older Icom radios used an electret mic with "phantom" power on the audio line, so require a blocking capacitor inline. Note too, that the output of a dynamic mic isn't as high as that of an electret, and probably won't provide sufficient level. YMMV.

[w9gb]

D.C. DE-COUPLING ON ICOM RIGS
ALL ICOM transceivers have 'Phantom Power' their microphone inputs.
Icom borrowed this technology approach (and using elecret elments) from the recording studios (music industry), d.c. power to power the f.e.t. element is fed down the mic line.
At the same time d.c. flows DOWN the mic cable the mic audio is fed UP the same wire. Of course this signal is a.c. D.C. flows one direction while A.C. flows the other direction - all on the same cable. Pretty cool huh?.....until you start having all kinds of RFI but we'll cover that in another addition of 'Harmonics'.

The BIG problem with this is when you try using a REAL microphone ....the good old copper wound, magnetic bobbin, dynamic. Connecting a dynamic into your mic input will provide a nice short of the +8 v.d.c, power straight to ground. SMOKE CITY!!!

To use any dynamic element on these phantom powered inputs (which should NEVER be applied to a mic input of a radio transmitter !!!) the input must be de-coupled so the mic audio a.c. signal can pass through to the mic preamp and yet, block the d.c. voltage from that mic element. Simply install a 1 mFd. non-polar tantalum capacitor in series with mic lead. You may get by with a .68 or a .47 mFd but anything less (.01, .005 etc) will not pass any speech audio worth listening to). The cap MUST be a non-polar. This will keep the D.C. from getting across the dynamic element while passing the speech audio through the cap into the mic preamp circuitry.

All Heil microphones have a 1 mFd. capacitor inside. All AD-1 boomset adapters have the decoupling cap installed the 8 pin Foster connector. The coupling cap is NOT installed in our new high impedance GM 'VINTAGE' microphone as they will never be used with ICOM low impedance inputs.
http://www.heilsound.com/amateur/harmonics.htm#DC