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I have been getting reports that the HM-36
shipped with the IC-7200( IC-718, IC-7600, IC-7700, IC-7800) is low and muffled. I obtained one and the
reports are absolutely right. It is the "Chinese" HM-36 (check the
rear of your mic) that is the problem. The Japanese one is alright. There are a few mods out there to improve it,
but they still use the stock
element. I installed my type #2 element - the one I use in the
HM-151 for the IC-7000 - and the HM-36 came to life. The difference
is obvious. The
frequency response opens up. It goes from muffled to clean and
robust.
The upgrade is actually more complex than the
one for the HM-151. This is because the DC biasing resistor is
incorrect as well in the HM-36. This means that the resistor, the
coupling cap and the element have to be replaced. I replace the
coupler cap with a SMD surface-mount unit.
I know you have other options (on-line mods), but I can guarantee
that
if you use my Type #2 element, you will have much better audio.
(check my reviews :
http://www.eham.net/reviews/detail/6580)
I'm setting the price at only $39.50 plus shipping.
Insured Priority 2-3 day return shipping is $7.50, so the total is:
$47. Ship it to:
Bob Nagy
121 Rainwood Ter.
Pearcy, AR. 71964
Stock HM-36 - Chinese
manufacture
HM-36 with AB5N Type #2 Element
Recording Conditions:
I used a FT-897D as the receiver (7600 for TX). I set the stock
microphone for a S-5 signal coming in. When the element was changed,
it had enough increased drive to give a S-9+ signal at the same mic
level. The RX AGC then kicked in, lowering the background noise.
Rather than lower the record volume, I just left it as it was- to
show you the difference in drive. My observation is that the Type #2
element does these things: It increases
audio drive by about 50%
It has more clarity over the entire range - opening up the sound.
It has a considerably more present and articulated audio.
It isn't as dramatic a difference as on the
IC-7000's mic - because the HM-151
on the IC-7000 is a much worse performer. On the HM-36 Chinese
edition, this is a nice upgrade for use with the Icom radios it
ships with.
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