HW-101/SB-102 Mic question

[Allen, KJ6XH]

Hello Bob,

Hi-Z is almost anything from 25K-ohms (sometimes 10K) on up. Normal Hi-Z
mikes are nominally 50K-ohms--especially dynamic.  A crystal mike can be
up in the meg-ohm range.

The SB-102 (I use this rig) is designed for a Hi-Z mike--theoretically 50K-ohms.
I use a communications mike (Hi-Z) when I need the crisp freq response toe cut
thru:  DX-ing, etc.
I use a low-Z broadcast mike for nets, rag-chewing, etc when I want a warm
arm-chair sound.  This does require impedance conversion.  Either a transformer
mounted in a shielded box and fed into the rig's mike connector; or, a simple
one-transister preamp (9-volt battery) mounted in the box. Either works well.
The Turner 253 at 159-ohms would do well here as long as you get the
sound-quality you want.

Your main concern is to get enough mike output to give adequate ALC
action, without picking up hum.  Which of the above methods you use---
the SB-102 couldn't care less!

Allen

"Bob, WB2UJD" wrote:

> Hi guys,
>
> I know that these rigs are supposed to be used with a Hi-Z microphone.  How
> High?  Has anyone used them with low impedance mic's?  How do they work?  I
> only have a beat up shure Hi-Z handheld mic for the 2 HW's and one SB I own
> and am looking for a nice desk mic.  I have my eye on some what look to be
> NOS, Turner Model 253 Dynamic 150 OHMS on Ebay but fear one of those might
> not work for beans with these rigs (without mic ckt mods).  Thoughts?  Thanks
> in advance and 73,
>
> Bob, WB2UJD
>
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73 de Rev. Allen, KJ6XH      Real Radios glow in the dark!
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