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[K3] Heil HM-12 microphone

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dmb@lightstream.net

[K3] Heil HM-12 microphone

Hello,

I'm trying to get a Heil HM-12 microphone to work from the front panel.
Even with the Mic gain set to 60, and MIC SEL set to FP.H, I have to
shout in order to see any ALC bars.

According to the K3 Owner's Manual in the MAIN Menu section describing
"MIC SEL" :
"... tap [3] to turn on an additional gain stage. Use this only with
very low-output mics. An apostrophe will appear after the H, e.g. H'"
Tapping [3] only produces "N/A" here.

I also find that significant EQ is needed to reduce low freq, and
increase high freq. output.

Anybody using the HM-12 with success on the K3?

73, Dale
WA8SRA

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Eric Swartz - WA6HHQ

Re: [K3] Heil HM-12 microphone

Administrator

Typo in the manual. Tap '7' to toggle the very high mic gain mode.

73, Eric

---
www.elecraft.com

On 10/18/2011 10:28 AM, Dale Boresz wrote:

> Hello,
>
> I'm trying to get a Heil HM-12 microphone to work from the front panel.
> Even with the Mic gain set to 60, and MIC SEL set to FP.H, I have to
> shout in order to see any ALC bars.
>
> According to the K3 Owner's Manual in the MAIN Menu section describing
> "MIC SEL" :
> "... tap [3] to turn on an additional gain stage. Use this only with
> very low-output mics. An apostrophe will appear after the H, e.g. H'"
> Tapping [3] only produces "N/A" here.
>
> I also find that significant EQ is needed to reduce low freq, and
> increase high freq. output.
>
> Anybody using the HM-12 with success on the K3?
>
> 73, Dale
> WA8SRA
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html

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Iain G4SGX

Re: [K3] Heil HM-12 microphone

In reply to this post by dmb@lightstream.net

Hi,

I use the HM-12 with the matching cable for the K3.

So far, for my voice, I use the Mic-Sel on FP.H ( No extra gain with the
'7' button needed)
Mic Gain set to about 30 (+-3)
Compression about 15.

I did have to reduce bass and increase top end a fair bit though on Tx
Eq though, but that may just be my voice.

That may well help the levels so I don't need the extra gain setting .

Got a report of excellent audio today with those settings.

*Iain Haywood*
G4SGX

On 10/18/2011 6:28 PM, Dale Boresz wrote:

dmb@lightstream.net

Re: [K3] Heil HM-12 microphone

Thanks to all who responded to my question concerning the HM-12. The
microphone is working well now, and I thought I'd summarize my results
for anyone else who may wish to use this microphone.

Also, many thanks to Bob Heil for his helpful suggestions, specifically
that since the microphone was designed to be equalized, boosts or cuts
of 12 dB or more are expected, and should be employed as needed.

So here's how the dust settled:

-- The HM-12 is a dynamic mic, so no bias should be used.

-- Not sure where the additional mic gain stage is located in the
system, but I'd guess it's ahead of the front panel level control.
Although I can get enough drive with the Mic gain cranked up to about 50
with the additional gain stage turned off, the signal to noise ratio is
significantly better when the additional gain stage is engaged, and the
Mic control is set to about 12.

-- The final EQ settings were:
50 Hz : 0dB
100 Hz: 0 dB
200 Hz: -3 dB
400 Hz: -3 dB
800 Hz: + 3 dB
1.6 KHz: + 6 dB
2.4 KHz: + 12 dB
3.20 KHz: + 12 dB

TX roofing filter used is the 2.8K 8-pole

Not suggesting that these are the best settings, but they sound good to
me (for my voice) when monitoring the transmitted signal on a second SDR
receiver that has a flat and neutral receive audio response.

73, Dale
WA8SRA

On 10/18/2011 6:52 PM, Iain wrote:

> Hi,
>
> I use the HM-12 with the matching cable for the K3.
>
> So far, for my voice, I use the Mic-Sel on FP.H ( No extra gain with the
> '7' button needed)
> Mic Gain set to about 30 (+-3)
> Compression about 15.
>
> I did have to reduce bass and increase top end a fair bit though on Tx
> Eq though, but that may just be my voice.
>
> That may well help the levels so I don't need the extra gain setting .
>
> Got a report of excellent audio today with those settings.
>
>
>
> *Iain Haywood*
> G4SGX
>
> On 10/18/2011 6:28 PM, Dale Boresz wrote:
>> Hello,
>>
>> I'm trying to get a Heil HM-12 microphone to work from the front panel.
>> Even with the Mic gain set to 60, and MIC SEL set to FP.H, I have to
>> shout in order to see any ALC bars.
>>
>> According to the K3 Owner's Manual in the MAIN Menu section describing
>> "MIC SEL" :
>> "... tap [3] to turn on an additional gain stage. Use this only with
>> very low-output mics. An apostrophe will appear after the H, e.g. H'"
>> Tapping [3] only produces "N/A" here.
>>
>> I also find that significant EQ is needed to reduce low freq, and
>> increase high freq. output.
>>
>> Anybody using the HM-12 with success on the K3?
>>
>> 73, Dale
>> WA8SRA
>>
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>