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Subject: Re: [Elecraft] Background Noise with Mike Plugged in to Rear,
, Mike Jack
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In my experience, the single most important factor in reducing RFI
problems is to prevent RF from flowing back into the sta
Hi Vic,
I'm quoting only the lead sentence for context, but ALL of this post is
absolutely right! The only thing I would add is that proper bonding in
the shack and in the home is also critical.
BTW -- you and I have been working each other since about 1957!
73, Jim K9YC (ex-W8FNI)
On
In my experience, the single most important factor in reducing RFI
problems is to prevent RF from flowing back into the station via common
mode current on the feedline. This is easiest to do with balanced
antennas. If they are coax-fed, then you need the appropriate choke at
the feedpoint. And
Re - Bob, K4TAX, on whether to use ferrite beads to solve station
issues ...
___
Several years ago, when I was a new ham, Bob K4TAX encouraged me to
solve RFI/EMI and other issues, instead of populating the station with
ferrite beads, and this admonition
Correction: “bonded and grounded” not “bounded and grounded.” Sorry for
typo…. ;-)
73,
Dave - N5DCH
> On Nov 24, 2021, at 11:49 AM, David Herring wrote:
>
> I don’t disagree with K4TAX. It’s up to the operator to work out RFI at
> one’s station.
>
> But for the sake of clarity to
I don’t disagree with K4TAX. It’s up to the operator to work out RFI at one’s
station.
But for the sake of clarity to those that may read this thread later…
The rigs in question in this part of the thread are the K4.
Every component of my station is bounded and grounded per K9YC’s
Running my K3S, KPA500 and working 160M - 6M at 500 watts, using either
a mike into the front of the radio, or my headset into the back, I
experience NO RFI issues. I don't have any toroids on any cables
either. I also run digital modes with a single USB cable between the
computer and the
The failure that lead me to a new CM-500 was a broken microphone
attachment to the headphone. If I was CW/digital only, no
microphone might be an improvement. :-)
BTW, I got the replacement from B sales who listed it as a
dynamic microphone. It isn't dynamic. It is electret and
requires a
Yes, I kind of think you are right, Jim. I did not know about the
requirement to set Lin In with Lin In selected, and Mic Gain with Mic
selected. I had been doing adjustments in Mic+Lin with the front panel
Mic Gain only, assuming that in Mic +Lin it controlled both. Whew -
good to know
On 11/21/2021 9:50 PM, Wes wrote:
If I wasn't the first, I was the second, person to recommend the CM-500.
As far as I know, W6XU, who runs a consumer/semi-pro audio mfg biz,
introduced the CM500 to ham radio with a large group purchase for the
Northern California Contest Club. I'm guessing
If I wasn't the first, I was the second, person to recommend the CM-500. I've
used them on both my original K3 and a new K3S. IIRC I've gone through three of
them; buying new ones when the pads wear out. I have never had RFI issues with
them (or anything else for that matter). The only
On 11/21/2021 7:55 PM, Pete Smith N4ZR wrote:
I don't think RFI is implicated. I can hear the loud background noise
even with the RF turned way down. This is something else, I believe,
perhaps something about the way the gain is distributed, or???
Hi Pete,
I suspect you may be right. When
I don't think RFI is implicated. I can hear the loud background noise
even with the RF turned way down. This is something else, I believe,
perhaps something about the way the gain is distributed, or???
73, Pete N4ZR
Check out the new Reverse Beacon Network
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Interesting. I tried a ferrite and, although it reduced the problem, it
didn't cure it. I'm not sure it was a #31 mix, though, and I didn't wrap
that many turns. Will try again. Sure wish toroids were labeled!
Thanks,
/Rick N6XI
On Sun, Nov 21, 2021 at 5:55 PM David Herring wrote:
> I also
I also had RF problems with the CM-500 plugged into the rear mic jack. The
solution I’ve implemented so far was to wrap about 13 turns of the CM-500’s
cord around a #31 toroid. It both shortened the cord which was way too long for
my shack and eliminated the RF problem. A two-for-one solution.
Hi, Pete. Try a dynamic mic or use the front panel (ugh) mic connector.
I've had RFI problems at high power using a CM-500 on the rear panel mic
jack. Elecraft are working on a fix. My Heil headset with dynamic mic works
fine.
73,
/Rick N6XI
On Sun, Nov 21, 2021 at 5:32 PM Pete Smith N4ZR
I don't normally operate phone, but wanted to contribute a few QSOs to
my club in SS SSB. So I recorded messages on my external USB sound
card, using Audacity. They sounded fine, both on a speaker and on my
K3's monitor. So then I plugged my Yamaha CM-500 condenser mike headset
into the
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