Heil products are wildly overpriced and highly over-rated. No ham needs
a boom mic headset better than a Yamaha CM500, which sounds great both
in the headphones and one the air, is very comfortable, costs about $60,
and has ZERO RFI issues. I'm a Fellow of the Audio Engineering Society,
have a storage room full of great mics far better than anything Heil
makes, do very serious contesting. and I've used nothing but the CM500
for more than ten years. What pro audio folks say about Bose applies
equally to Heil -- "better sound through marketing."
The CM500 plugs straight into the back of an version of a K3 (and
probably a K4), and I'll be happy to list TXEQ settings that make it
sound FAR better than Heil headset mics.
I've been a member of the AES Standards Committee Working Group on
Microphones for almost 30 years, and I've never met Bob Heil or anyone
from his company. That should tell you something about how
"professional" he and his company are. :) This whole thing about "I did
sound for XXX rock band is, as my Black friends would say, "a whole
bunch of shuck and jive."
73, Jim K9YC
On 6/16/2021 8:36 PM, Drew Arnett wrote:
Shield of mic jack goes to bare metal Elecraft thoughtfully left on
the chassis metal. 10 nF shunt to ground. (Need to see where that
is, but hopefully SMT and with very small loop area.) Sheet 9:
https://ftp.elecraft.com/KX3/Manuals%20Downloads/KX3SchematicDiagramDec2012.pdf
Heil suggests on their tips page generous ferrite choking of all 3
leads of their Y adapter cable:
https://heilhamradio.com/support/tips/
Drew
n7da
On Thu, Jun 17, 2021 at 3:23 AM Drew Arnett <arnett.d...@gmail.com> wrote:
Hi,
In the KX3 for Field Day department, we plan to use it for the GOTA
station for phone on HF. (Yes, will have antennas not on top of each
other and bandpass filters on ALL radios.) Would be great to setup
with a headset and foot switch.
Last weekend, I used my KX3 barefoot on 6 and with a
transverters-store.com transverter (also barefoot) for 2. 6m antenna
was 2 elements about 15 ft above the ground and 2m antenna 6 elements
at 10 feet above the ground.
I worked a couple of contacts on 2m phone with the headset. Later,
when I tried to use the headset for phone on 6, seemed like I was
having a feedback problem. Cabling was the stock cabling that comes
with the Heil Pro 7 headset and a footswitch. Monitor was on and set
to 4.
So, ALC didn't indicate anything at the normal level (60), and
increasing it very abruptly caused horrible sounding audio. (Yes,
acts like positive feedback.)
I have a small electret mic on a 1/8 plug thing I bought some time ago
from the computer store. (Meant at the time for adding mic to
laptops.) I have a 1/8" audio extension cable for it. I plugged that
in instead of the headset mic and it seemed to act normally.
Is this purely an RF from the TX antenna getting into the mic audio
problem or is it something else?
Best practice to avoid this problem?
On my todo list:
- ask here
- look at KX3 schematic to see if it has RF ingress mitigation on the mic jack
- ask Heil
- unplug the Heil mic element and gator clip my cheap electret mic on
instead and try on 6m in driveway with identical antenna/mast/radio
setup
- look for or assemble an RF filter to inline with the mic jack (tough
to do with this little time
before field day)
Thanks and best regards,
Drew
n7da
ps. Other than this, KX3 was great in the VHF test. Worked great
with the transverter on 2 and was a lot of fun running barefoot with
the sporadic E opening Saturday afternoon & evening.
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