Re: [Elecraft] 10 MHz reference osc. suggestion?

[Clay Autery]

That looks like a fun project.  I may build that pair of units as a 
field unit...


__
Clay Autery, KY5G
(318) 518-1389

On 02/05/20 21:37, K1FFX wrote:

If a build-from-kit solution would work for you, I can recommend two kits
from
qrp-labs.com   .  This is the ProgRock
"triple programmable crystal" kit, which can be GPS-disciplined by the
QLG-1 GPS receiver.   I've built these (and other) kits from QRP Labs: high
quality, excellent build instructions, and very economical.  If a sine wave
is desired for your application, you could add an appropriate (probably 30
meter)
LPF kit.

Best -

Bruce K1FFX




-
Bruce Rosen
K1FFX
K2/100 6982 KSB2 KAT100-1 KAF2 KIO2

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Re: [Elecraft] 10 MHz reference osc. suggestion?

[K1FFX]

If a build-from-kit solution would work for you, I can recommend two kits
from
qrp-labs.com   .  This is the ProgRock
"triple programmable crystal" kit, which can be GPS-disciplined by the
QLG-1 GPS receiver.   I've built these (and other) kits from QRP Labs: high
quality, excellent build instructions, and very economical.  If a sine wave
is desired for your application, you could add an appropriate (probably 30
meter)
LPF kit.

Best -

Bruce K1FFX




-
Bruce Rosen
K1FFX
K2/100 6982 KSB2 KAT100-1 KAF2 KIO2

--
Sent from: http://elecraft.365791.n2.nabble.com/
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[Elecraft] Review of W8FGU Services, LLC

[Bernie and Cheryl]

Dave Van Wallaghen is who I was referred to by Elecraft for a thorny 
problem with my K2. A number of knowledgeable people had looked at the 
problem and given up. Not only did Dave spend a long time with me on 
email exchanges, trying to help me fix the problem on my own, but once 
he got the radio in his hands, he figured out what was wrong and fixed 
it within a fairly short period of time. His bill was eminently 
reasonable. I highly recommend him and his work product to anyone having 
an Elecraft problem.


I highly recommend him.

73 de Bernie, KF0QS

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Re: [Elecraft] 10 MHz reference osc. suggestion?

[Brian Denley]

I bought the BG7TBL one for about $160. I worked perfectly right out of the box.

Brian Denley
KB1VBF
Sent from my iPad

> On Feb 5, 2020, at 9:16 PM, Clay Autery  wrote:
> 
> I use the Dual Output part from Leo Bodnar so I can set one at 10MHz, and 
> the other on a different frequency for use with my VNA.
> 
> Additionally, I use Bodnar's NTP Server to serve extremely accurate time to 
> everything that I own with an electronically settable clock, including my K3s 
> (indirectly).
> 
> There are better units available... maybe... but NOT at a cost I am willing 
> to pay.
> 
> I am VERY happy with my Bodnar stuff.
> 
> 73,
> 
> __
> Clay Autery, KY5G
> (318) 518-1389
> 
>> On 02/05/20 13:43, Gary Peterson wrote:
>> Does anyone have any recommendations for a particular 10 MHz GPS disciplined 
>> oscillator that would work well as an external reference for a K3S?  I might 
>> also use a GPSDO as an external time base for my frequency counter.  Either 
>> recommendations or products one should avoid would be most appreciated.  
>> Feel free to reply off list.
>> 
>> Thanks in advance.
>> 
>> Gary, K0CX
>> kzer...@gmail.com
>> __
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Re: [Elecraft] 10 MHz reference osc. suggestion?

[Clay Autery]

I use the Dual Output part from Leo Bodnar so I can set one at 10MHz, 
and the other on a different frequency for use with my VNA.


Additionally, I use Bodnar's NTP Server to serve extremely accurate time 
to everything that I own with an electronically settable clock, 
including my K3s (indirectly).


There are better units available... maybe... but NOT at a cost I am 
willing to pay.


I am VERY happy with my Bodnar stuff.

73,

__
Clay Autery, KY5G
(318) 518-1389

On 02/05/20 13:43, Gary Peterson wrote:

Does anyone have any recommendations for a particular 10 MHz GPS disciplined 
oscillator that would work well as an external reference for a K3S?  I might 
also use a GPSDO as an external time base for my frequency counter.  Either 
recommendations or products one should avoid would be most appreciated.  Feel 
free to reply off list.

Thanks in advance.

Gary, K0CX
kzer...@gmail.com
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Re: [Elecraft] RF feedback into MH3 mic with KX3 on 2m

[Nr4c]

Yes. Headphone to mic distance gets short and feedback can happen from leakage. 

Sent from my iPhone
...nr4c. bill


> On Feb 5, 2020, at 10:44 AM, Richard Corfield  
> wrote:
> 
> 
> Even with monitor running into headphones?
> 
> I was running the contest with monitor off at first, but I turned monitor on 
> only in response to my contact telling me my audio was garbled. That said, I 
> initially wondered if the garble was due to frequency drift not feedback. 
> Though if it was a monitor problem it would also manifest on HF and through 
> the vocal mic?
> 
> I can try though. I know the headphones leak, closed as they are, as I've 
> picked up notification beeps when using the field recorder and monitoring on 
> headphones while recording my voice.
> 
>  - Richard
> 
> 
>> On Wed, 5 Feb 2020 at 15:29, Nr4c  wrote:
>> Turn down TX Monitor volume. 
>> 
>> Sent from my iPhone
>> ...nr4c. bill
>> 
>> 
>> > On Feb 5, 2020, at 5:23 AM, Richard Corfield  
>> > wrote:
>> > 
>> > I had issues with RF feedback on the MH3 during the UKAC SSB 2m contest
>> > last night. It seemed intermittent. Result was terrible noise in Monitor
>> > output (my headphones) and to the other station, so it affects the audio
>> > input. With experiments at the time and this morning:
>> > 
>> > 
>> >   - Occurs when RF power is increased above 0 and when Mic Gain is
>> >   increased. I could operate with Mic Gain set low, obviously at reduced
>> >   power out. (Indicative of a feedback loop)
>> >   - Occurs with a dummy load. (Also when I moved the antenna away last
>> >   night). So is the loop internal or is it so sensitive the small leak 
>> > from a
>> >   dummy load is enough?
>> >   - Does not occur if I feed a stage Mic In through a field mixer (kit I
>> >   have to hand). The field mixer claims an output impedance of 150R and is
>> >   running at mic level to match the MH3 allowing same gain setup in the 
>> > KX3.
>> >   Mic Bias is turned off in this case.
>> >   - Does not occur on HF into the dummy load.
>> >   - Manifests as buzzing on 2m FM
>> >   - May result in phantom button presses on the KX3 Mic (I didn't think I
>> >   knocked the dial)
>> > 
>> > As an aside - one station last night was loud enough to activate the "RX"
>> > indicator which I take to be input overload. S meter was well over S9 but
>> > not at the top. I didn't see anyone else at the site, unless they were
>> > hiding the the woodland carpark but I saw no light there or on the summit
>> > behind me. I hit ATT, should have swung the beam to try to null them. But I
>> > guess the ATT and even maybe the input protection is after the 2m module's
>> > input?
>> > 
>> > My thought is I need to inspect the wiring in the mic. Or could there be
>> > anything else I need to check?
>> > 
>> > Thanks
>> >  - Richard
>> > __
>> > Elecraft mailing list
>> > Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> > Help: http://mailman.qth.net/mmfaq.htm
>> > Post: mailto:Elecraft@mailman.qth.net
>> > 
>> > This list hosted by: http://www.qsl.net
>> > Please help support this email list: http://www.qsl.net/donate.html
>> > Message delivered to n...@widomaker.com 
>> 
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Re: [Elecraft] 10 MHz reference osc. suggestion?

[Wes]

I have a Bodnar dual output GPSDO although I don't use it on my K3S.  Be advised 
that the software is very clunky and while you can get two different frequencies 
out, there are limitations on what they can be.


Frankly, I don't know why you would want something like this for the K3(S).  The 
high stability TCXO is fine if you leave the radio powered continuously as I do, 
otherwise, it's quite good after about a 20 minute warmup.  Use your counter to 
measure the TCXO directly and adjust the ref cal parameter manually.


Wes  N7WS


On 2/5/2020 12:48 PM, Dave Van Wallaghen wrote:

Hi Gary,

Here is the one I use: 
http://www.leobodnar.com/shop/index.php?main_page=product_info=107_id=234


It feeds my K3 and I also use the other port to calibrate the oscillator for 
the main MCU on all the K2's I service.


73,
Dave, W8FGU


On 2/5/2020 2:43:46 PM, "Gary Peterson"  wrote:

Does anyone have any recommendations for a particular 10 MHz GPS disciplined 
oscillator that would work well as an external reference for a K3S?  I might 
also use a GPSDO as an external time base for my frequency counter.  Either 
recommendations or products one should avoid would be most appreciated.  Feel 
free to reply off list.


Thanks in advance.

Gary, K0CX
kzer...@gmail.com 


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Re: [Elecraft] 10 MHz reference osc. suggestion?

[Mooneer Salem]

I used this one from Geppetto Electronics when I last ran temperature
compensation on my KX3:
https://www.tindie.com/products/nsayer/gps-disciplined-ocxo/. One advantage
is that it also produces NMEA output along with PPS, so one could build a
GPS-based NTP server at some point in the future. It also uses a OCXO
instead of a TCXO, so temperature changes should be less of a factor in its
accuracy (though I'm not sure that matters much for normal ham radio use).

-Mooneer K6AQ

On Wed, Feb 5, 2020 at 11:45 AM Gary Peterson  wrote:

> Does anyone have any recommendations for a particular 10 MHz GPS
> disciplined oscillator that would work well as an external reference for a
> K3S?  I might also use a GPSDO as an external time base for my frequency
> counter.  Either recommendations or products one should avoid would be most
> appreciated.  Feel free to reply off list.
>
> Thanks in advance.
>
> Gary, K0CX
> kzer...@gmail.com
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Re: [Elecraft] RF feedback into MH3 mic with KX3 on 2m

[Richard Corfield]

The metal shield cover on the 2m module was not flat but slightly raised at
the edge. I have pressed this back on and the problem seems cleared. So I
guess it was contacting or coming close to the circuit board on the control
module, perhaps that giving the feedback loop for RF. Question is - could
any damage have done if it had contacted the vias/pads on the board there?

 - Richard

On Wed, 5 Feb 2020 at 21:01, Richard Corfield 
wrote:

> I've done some further tests and proven the problem is with the MH3. So
> I'll have to take that apart and look for the problem.
> The radio is fine with little earbuds/mic plugged in via splitter cable.
> Swap out the mic on the earbuds with the MH3 and leave all the rest the
> same and it goes wrong.
>
>  Thanks
>  - Richard
>
> On Wed, 5 Feb 2020 at 15:29, Nr4c  wrote:
>
>> Turn down TX Monitor volume.
>>
>> Sent from my iPhone
>> ...nr4c. bill
>>
>>
>> > On Feb 5, 2020, at 5:23 AM, Richard Corfield <
>> richard.corfi...@gmail.com> wrote:
>> >
>> > I had issues with RF feedback on the MH3 during the UKAC SSB 2m contest
>> > last night. It seemed intermittent. Result was terrible noise in Monitor
>> > output (my headphones) and to the other station, so it affects the audio
>> > input. With experiments at the time and this morning:
>> >
>> >
>> >   - Occurs when RF power is increased above 0 and when Mic Gain is
>> >   increased. I could operate with Mic Gain set low, obviously at reduced
>> >   power out. (Indicative of a feedback loop)
>> >   - Occurs with a dummy load. (Also when I moved the antenna away last
>> >   night). So is the loop internal or is it so sensitive the small leak
>> from a
>> >   dummy load is enough?
>> >   - Does not occur if I feed a stage Mic In through a field mixer (kit I
>> >   have to hand). The field mixer claims an output impedance of 150R and
>> is
>> >   running at mic level to match the MH3 allowing same gain setup in the
>> KX3.
>> >   Mic Bias is turned off in this case.
>> >   - Does not occur on HF into the dummy load.
>> >   - Manifests as buzzing on 2m FM
>> >   - May result in phantom button presses on the KX3 Mic (I didn't think
>> I
>> >   knocked the dial)
>> >
>> > As an aside - one station last night was loud enough to activate the
>> "RX"
>> > indicator which I take to be input overload. S meter was well over S9
>> but
>> > not at the top. I didn't see anyone else at the site, unless they were
>> > hiding the the woodland carpark but I saw no light there or on the
>> summit
>> > behind me. I hit ATT, should have swung the beam to try to null them.
>> But I
>> > guess the ATT and even maybe the input protection is after the 2m
>> module's
>> > input?
>> >
>> > My thought is I need to inspect the wiring in the mic. Or could there be
>> > anything else I need to check?
>> >
>> > Thanks
>> >  - Richard
>> > __
>> > Elecraft mailing list
>> > Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> > Help: http://mailman.qth.net/mmfaq.htm
>> > Post: mailto:Elecraft@mailman.qth.net
>> >
>> > This list hosted by: http://www.qsl.net
>> > Please help support this email list: http://www.qsl.net/donate.html
>> > Message delivered to n...@widomaker.com
>>
>>
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Re: [Elecraft] 10 MHz reference osc. suggestion?

[Conrad PA5Y]

Leo Bodnar, small and work great.

http://www.leobodnar.com/shop/index.php?main_page=product_info_id=301

73

Conrad PA5Y

-Original Message-
From: elecraft-boun...@mailman.qth.net  On 
Behalf Of Gary Peterson
Sent: 05 February 2020 20:44
To: elecraft@mailman.qth.net
Subject: [Elecraft] 10 MHz reference osc. suggestion?

Does anyone have any recommendations for a particular 10 MHz GPS disciplined 
oscillator that would work well as an external reference for a K3S?  I might 
also use a GPSDO as an external time base for my frequency counter.  Either 
recommendations or products one should avoid would be most appreciated.  Feel 
free to reply off list.

Thanks in advance.

Gary, K0CX
kzer...@gmail.com
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delivered to g0...@g0ruz.com 
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Re: [Elecraft] RF feedback into MH3 mic with KX3 on 2m

[Richard Corfield]

I've done some further tests and proven the problem is with the MH3. So
I'll have to take that apart and look for the problem.
The radio is fine with little earbuds/mic plugged in via splitter cable.
Swap out the mic on the earbuds with the MH3 and leave all the rest the
same and it goes wrong.

 Thanks
 - Richard

On Wed, 5 Feb 2020 at 15:29, Nr4c  wrote:

> Turn down TX Monitor volume.
>
> Sent from my iPhone
> ...nr4c. bill
>
>
> > On Feb 5, 2020, at 5:23 AM, Richard Corfield 
> wrote:
> >
> > I had issues with RF feedback on the MH3 during the UKAC SSB 2m contest
> > last night. It seemed intermittent. Result was terrible noise in Monitor
> > output (my headphones) and to the other station, so it affects the audio
> > input. With experiments at the time and this morning:
> >
> >
> >   - Occurs when RF power is increased above 0 and when Mic Gain is
> >   increased. I could operate with Mic Gain set low, obviously at reduced
> >   power out. (Indicative of a feedback loop)
> >   - Occurs with a dummy load. (Also when I moved the antenna away last
> >   night). So is the loop internal or is it so sensitive the small leak
> from a
> >   dummy load is enough?
> >   - Does not occur if I feed a stage Mic In through a field mixer (kit I
> >   have to hand). The field mixer claims an output impedance of 150R and
> is
> >   running at mic level to match the MH3 allowing same gain setup in the
> KX3.
> >   Mic Bias is turned off in this case.
> >   - Does not occur on HF into the dummy load.
> >   - Manifests as buzzing on 2m FM
> >   - May result in phantom button presses on the KX3 Mic (I didn't think I
> >   knocked the dial)
> >
> > As an aside - one station last night was loud enough to activate the "RX"
> > indicator which I take to be input overload. S meter was well over S9 but
> > not at the top. I didn't see anyone else at the site, unless they were
> > hiding the the woodland carpark but I saw no light there or on the summit
> > behind me. I hit ATT, should have swung the beam to try to null them.
> But I
> > guess the ATT and even maybe the input protection is after the 2m
> module's
> > input?
> >
> > My thought is I need to inspect the wiring in the mic. Or could there be
> > anything else I need to check?
> >
> > Thanks
> >  - Richard
> > __
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> > Help: http://mailman.qth.net/mmfaq.htm
> > Post: mailto:Elecraft@mailman.qth.net
> >
> > This list hosted by: http://www.qsl.net
> > Please help support this email list: http://www.qsl.net/donate.html
> > Message delivered to n...@widomaker.com
>
>
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Re: [Elecraft] 10 MHz reference osc. suggestion?

[David Box]

He also sells the Mini version with one output, I have the Mini on the 
K3 and the dual output version on my workbench.


http://www.leobodnar.com/shop/index.php?main_page=product_info=107_id=301

de Dave K5MWR

On 2/5/2020 13:48, Dave Van Wallaghen wrote:

Hi Gary,

Here is the one I use: 
http://www.leobodnar.com/shop/index.php?main_page=product_info=107_id=234


It feeds my K3 and I also use the other port to calibrate the 
oscillator for the main MCU on all the K2's I service.


73,
Dave, W8FGU


On 2/5/2020 2:43:46 PM, "Gary Peterson"  wrote:

Does anyone have any recommendations for a particular 10 MHz GPS 
disciplined oscillator that would work well as an external reference 
for a K3S?  I might also use a GPSDO as an external time base for my 
frequency counter.  Either recommendations or products one should 
avoid would be most appreciated.  Feel free to reply off list.


Thanks in advance.

Gary, K0CX
kzer...@gmail.com
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Re: [Elecraft] 10 MHz reference osc. suggestion?

[Dave Van Wallaghen]

Hi Gary,

Here is the one I use: 
http://www.leobodnar.com/shop/index.php?main_page=product_info=107_id=234


It feeds my K3 and I also use the other port to calibrate the oscillator 
for the main MCU on all the K2's I service.


73,
Dave, W8FGU


On 2/5/2020 2:43:46 PM, "Gary Peterson"  wrote:


Does anyone have any recommendations for a particular 10 MHz GPS disciplined 
oscillator that would work well as an external reference for a K3S?  I might 
also use a GPSDO as an external time base for my frequency counter.  Either 
recommendations or products one should avoid would be most appreciated.  Feel 
free to reply off list.

Thanks in advance.

Gary, K0CX
kzer...@gmail.com
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[Elecraft] 10 MHz reference osc. suggestion?

[Gary Peterson]

Does anyone have any recommendations for a particular 10 MHz GPS disciplined 
oscillator that would work well as an external reference for a K3S?  I might 
also use a GPSDO as an external time base for my frequency counter.  Either 
recommendations or products one should avoid would be most appreciated.  Feel 
free to reply off list.

Thanks in advance.

Gary, K0CX
kzer...@gmail.com
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[Elecraft] Elecraft K1 for sale - Loaded

[Denis Dimick]

I have a barely used Elecraft K1 for sale (S/N-01351), bought the kit back
in 2002, I just needed something to keep me busy, so I bought it and built
it.I love the receiver on this baby, and used it for a lot of weak signal
stuff, I have replaced it with a K3, so I'm looking at selling it.
It's a 4 band unit, not a 2x2 swap, 15,20,30, and 40 meters, has the Noise
Blanker, ATU-4-bands, back light LCD, and the KC6AUP 3d printed folding
stand installed. Basically everything except the internal battery kit.
I have the original assembly manual with my build notes in it, with my
adjustment notes made during the build, as well as the other manuals that
came with the kit.

I'm asking $500, and will take Paypal, we can work out how you want to do
the shipping.

73's
Denis
KC6AUP

--
There is no future until we settle our past...
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Re: [Elecraft] KPA3 in K3S mostly not working

[Keith Trinity WE6R]

If it is intermittent, then check for the KPA3A not being seated all the 
way down (pull Fan panel, 4 screws and inspect).
Or it could be the relay on the KPAIO3A riser board. To confirm; click 
above and below 12W a bunch of times, if occasionally the RX comes and 
goes, it is that relay.
Components on the KPA3A can make the RX poor, but usually when they 
fail, they are not intermittent.
If you send it in, I will make sure it has the current Revisions of the 
LPA and KPA. There are new ones since your rig was here in Jan 2017.

Keith WE6R
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Re: [Elecraft] RF feedback into MH3 mic with KX3 on 2m

[Richard Corfield]

Even with monitor running into headphones?

I was running the contest with monitor off at first, but I turned monitor
on only in response to my contact telling me my audio was garbled. That
said, I initially wondered if the garble was due to frequency drift not
feedback. Though if it was a monitor problem it would also manifest on HF
and through the vocal mic?

I can try though. I know the headphones leak, closed as they are, as I've
picked up notification beeps when using the field recorder and monitoring
on headphones while recording my voice.

 - Richard


On Wed, 5 Feb 2020 at 15:29, Nr4c  wrote:

> Turn down TX Monitor volume.
>
> Sent from my iPhone
> ...nr4c. bill
>
>
> > On Feb 5, 2020, at 5:23 AM, Richard Corfield 
> wrote:
> >
> > I had issues with RF feedback on the MH3 during the UKAC SSB 2m contest
> > last night. It seemed intermittent. Result was terrible noise in Monitor
> > output (my headphones) and to the other station, so it affects the audio
> > input. With experiments at the time and this morning:
> >
> >
> >   - Occurs when RF power is increased above 0 and when Mic Gain is
> >   increased. I could operate with Mic Gain set low, obviously at reduced
> >   power out. (Indicative of a feedback loop)
> >   - Occurs with a dummy load. (Also when I moved the antenna away last
> >   night). So is the loop internal or is it so sensitive the small leak
> from a
> >   dummy load is enough?
> >   - Does not occur if I feed a stage Mic In through a field mixer (kit I
> >   have to hand). The field mixer claims an output impedance of 150R and
> is
> >   running at mic level to match the MH3 allowing same gain setup in the
> KX3.
> >   Mic Bias is turned off in this case.
> >   - Does not occur on HF into the dummy load.
> >   - Manifests as buzzing on 2m FM
> >   - May result in phantom button presses on the KX3 Mic (I didn't think I
> >   knocked the dial)
> >
> > As an aside - one station last night was loud enough to activate the "RX"
> > indicator which I take to be input overload. S meter was well over S9 but
> > not at the top. I didn't see anyone else at the site, unless they were
> > hiding the the woodland carpark but I saw no light there or on the summit
> > behind me. I hit ATT, should have swung the beam to try to null them.
> But I
> > guess the ATT and even maybe the input protection is after the 2m
> module's
> > input?
> >
> > My thought is I need to inspect the wiring in the mic. Or could there be
> > anything else I need to check?
> >
> > Thanks
> >  - Richard
> > __
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>
>
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Re: [Elecraft] KX3 I/Q output and band width

[gt-i]

Walter,
thanks for the pointer. Will give it a try. Not sure how to combine the
two, lets see.
73 Gernot

Am 04.02.2020 um 23:52 schrieb Walter Underwood:

You actually have 22 kHz of in-phase signal and 22 kHz of quadrature signal
on the stereo output. You can combine those to get 44 kHz of bandwidth.

More info here:

https://en.wikipedia.org/wiki/In-phase_and_quadrature_components

wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)


On Feb 4, 2020, at 2:45 PM, g...@gmx.net wrote:

Hello,
for a long time I just haven't looked into the details, but now I did
and I'am confused.
When I plug it into a soundcard it appears to show the current station
in the center of the display, to my understanding the center of the
display is the half of the sampling frequency of the sound card.
This ist at least confirmed in the manual pg. 26 (Rev C5).

When I sample the I/Q signal by myself, the same signal appears at the
lower end of my spectrum.
Now it looks like I'm not getting the full bandwidth sampled? With fs of
44.1kHz I can only see 22kHz of bandwidth after FFT.

So, according to many articles I read about FFT, the resulting bandwidth
is always fs/2. So how can we see 44kHz of spectrum on a 44kHz sound
card? I'm confused...

73 Gernot DF5RF

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Re: [Elecraft] RF feedback into MH3 mic with KX3 on 2m

[Nr4c]

Turn down TX Monitor volume. 

Sent from my iPhone
...nr4c. bill


> On Feb 5, 2020, at 5:23 AM, Richard Corfield  
> wrote:
> 
> I had issues with RF feedback on the MH3 during the UKAC SSB 2m contest
> last night. It seemed intermittent. Result was terrible noise in Monitor
> output (my headphones) and to the other station, so it affects the audio
> input. With experiments at the time and this morning:
> 
> 
>   - Occurs when RF power is increased above 0 and when Mic Gain is
>   increased. I could operate with Mic Gain set low, obviously at reduced
>   power out. (Indicative of a feedback loop)
>   - Occurs with a dummy load. (Also when I moved the antenna away last
>   night). So is the loop internal or is it so sensitive the small leak from a
>   dummy load is enough?
>   - Does not occur if I feed a stage Mic In through a field mixer (kit I
>   have to hand). The field mixer claims an output impedance of 150R and is
>   running at mic level to match the MH3 allowing same gain setup in the KX3.
>   Mic Bias is turned off in this case.
>   - Does not occur on HF into the dummy load.
>   - Manifests as buzzing on 2m FM
>   - May result in phantom button presses on the KX3 Mic (I didn't think I
>   knocked the dial)
> 
> As an aside - one station last night was loud enough to activate the "RX"
> indicator which I take to be input overload. S meter was well over S9 but
> not at the top. I didn't see anyone else at the site, unless they were
> hiding the the woodland carpark but I saw no light there or on the summit
> behind me. I hit ATT, should have swung the beam to try to null them. But I
> guess the ATT and even maybe the input protection is after the 2m module's
> input?
> 
> My thought is I need to inspect the wiring in the mic. Or could there be
> anything else I need to check?
> 
> Thanks
>  - Richard
> __
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[Elecraft] RF feedback into MH3 mic with KX3 on 2m

[Richard Corfield]

I had issues with RF feedback on the MH3 during the UKAC SSB 2m contest
last night. It seemed intermittent. Result was terrible noise in Monitor
output (my headphones) and to the other station, so it affects the audio
input. With experiments at the time and this morning:


   - Occurs when RF power is increased above 0 and when Mic Gain is
   increased. I could operate with Mic Gain set low, obviously at reduced
   power out. (Indicative of a feedback loop)
   - Occurs with a dummy load. (Also when I moved the antenna away last
   night). So is the loop internal or is it so sensitive the small leak from a
   dummy load is enough?
   - Does not occur if I feed a stage Mic In through a field mixer (kit I
   have to hand). The field mixer claims an output impedance of 150R and is
   running at mic level to match the MH3 allowing same gain setup in the KX3.
   Mic Bias is turned off in this case.
   - Does not occur on HF into the dummy load.
   - Manifests as buzzing on 2m FM
   - May result in phantom button presses on the KX3 Mic (I didn't think I
   knocked the dial)

As an aside - one station last night was loud enough to activate the "RX"
indicator which I take to be input overload. S meter was well over S9 but
not at the top. I didn't see anyone else at the site, unless they were
hiding the the woodland carpark but I saw no light there or on the summit
behind me. I hit ATT, should have swung the beam to try to null them. But I
guess the ATT and even maybe the input protection is after the 2m module's
input?

My thought is I need to inspect the wiring in the mic. Or could there be
anything else I need to check?

Thanks
  - Richard
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