Hello PSG,
Correct regarding the impedance. Heil does offer, or used to, an impedance
matching transformer to allow the Heil elements to be used on Drake/Collins
rigs. They even sell a special cable for Drake-Collins. However, they do not
work well. I have an HM10 and it barely has enough gain to use with my more
modern SS TT Omni VI. So, when you use the transformer, to up the impedance,
1) it still isn't high enough to match up to the Drake tube rigs, and 2) not
enough gain or output to run the rig properly. I suggest you sell the Heil,
and look for a good Shure 444(d), D-104, Drake/Astatic 7075/7077, EV 664 or
other good vintage high impedance microphone. The only other choice is to buy
one of those microphone preamps like the W2IHY unit. It has a preamp and
matching feature, I believe. Heil mics are good mics, but short on gain.
Also, they work ok with an outboard or inboard microphone processor, used to up
the gain.
73's
David
Wd9cmd
----- Original Message -----
From: John Stringer
To: Philip Grocki ; Drakelist
Sent: Wednesday, February 11, 2009 8:59 AM
Subject: Re: [Drakelist] Heil HM-10 Microphone.
The HC4 and HC5 elements in the HM10 are low impedance wheras the Drake
microphone inputs are high impedance.
Heil does make a microphone for Drake and Collins vintage radios. It has a
built in impedance changing transformer. It is known as the GMV.
John GI3KDR
-----Original Message-----
From: drakelist-boun...@zerobeat.net
[mailto:drakelist-boun...@zerobeat.net]on Behalf Of Philip Grocki
Sent: 11 February 2009 05:13
To: Drakelist
Subject: [Drakelist] Heil HM-10 Microphone.
Has any of the group ever have any compatibility problems with a Heil HM-10
microphone on Drake tube rigs? This particular model Heil seems to be for the
solid-state persuasion, from what I hear (??). Thank you.
PSG
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