[Elecraft] AD-1-K doesn't have blocking capacitor, Heil claims

[Don Wilhelm]

Dick,

Thanks for that added information.  BTW, most hams do not realize that 
one must be very specific when saying you are using a Heil microphone.  
With all the microphone and adapter combinations possible, things get 
quite confusing.
Everytime someone sends me a K2 for repair and tells me he is using a 
Heil microphone, it results in several email exchanges before I 
understand the microphone setup enough to test the SSB adapter as the 
owner would use it.

Never mind the situation where someone buys a used K2, sends it to me 
for updates and alignment/calibration and wants to use some Heil 
microphone with it - I need precise information about the microphone and 
the adapter, and often the owner does not know, so I have to ask many 
questions to get it straight.

73,
Don W3FPR

On 2/24/2012 7:02 PM, Dick Dievendorff wrote:
> http://heilsound.com/amateur/products/headphone-adapters/index.php
>
> Some Heil ICOM adapters have DC blocking capacitors. These are adapters like
> the AD-1-I.  I've used these when I had ICOM equipment, and I have a few
> lying around here.
>
> Some Heil ICOM adapters are designed for microphones that require bias,
> including Heil's "iC" series.  These are adapters like the AD-1-iC.   These
> don't have a blocking capacitor.
>
> Heil says the Kenwood (AD-1-K) and Yaesu (AD-1-Y) adapters never contained
> DC blocking capacitors. Therefore if you use the AD-1-K for an Elecraft rig,
> you choose bias or no bias depending on the K3's microphone configuration
> setting.
>
> I didn't intend to make any claims about ICOM-specific adapters or
> microphones in the note - I only wanted to determine if any AD-1-Ks had
> blocking capacitors.  Bob said they didn't.
>
> This means (to me) that I should be able to use Heil's AD-1-K for my
> Elecraft K3 for any microphone that has a 3.5 mm plug, whether or not that
> microphone requires bias, and the K3's configuration menu sets it up
> appropriately. If I had learned that some AD-1-K microphones had blocking
> capacitors (and I've seen that stated), then I'd be more careful about
> recommending the AD-1-K.
>
> Dick, K6KR
>