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K3 VFO tuning hash

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john lawrence-3

K3 VFO tuning hash

Now that 6 and 10 meters have been open to Europe and Africa, I frequent
these bands for the first time in the six months of owning a factory built K3 radio.

What I've discovered and reported to factory tech support is a very noticable hash noise
while in the receive mode with any bandwidth centered around 28.000 MHz to 28.050 MHz. And, it is also
present while tuning RIT. It sounds like synthesizer switching noise and its repetition rate increses when the VFO is set to fine
tuning. I do not hear it on any other band. I also don't hear it over the entire 10 meter band, just the region as stated.

Is this in other K3s or is there something going on that needs attention in only my radio? I called factory tech support over a week ago. Since they have not come up with an answer it seemed time to open it up to a wider group of users.

Thanks

73,

John, W1QS
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WILLIS COOKE

Re: K3 VFO tuning hash

John, I spend a lot of time on ten and a fair amount on six. I usually operate CW with most of my activity around 28.05. I hear some noise on ten meters occasionally when the band opens which I attribute to broad band interference coming in on skip. It varies with beam heading, but not with any tuning parameters. I have speculated that it may be a Broad Band over Power Line artifact, but I can't confirm that. Does your noise go away if you switch to a dummy load, or change your beam heading?

Willis 'Cookie' Cooke
K5EWJ

--- On Fri, 6/26/09, John Lawrence <[hidden email]> wrote:

> From: John Lawrence <[hidden email]>
> Subject: [Elecraft] K3 VFO tuning hash
> To: [hidden email]
> Date: Friday, June 26, 2009, 10:20 AM
> Now that 6 and 10 meters have been
> open to Europe and Africa, I frequent
> these bands for the first time in the six months of owning
> a factory built K3 radio.
>
> What I've discovered and reported to factory tech support
> is a very noticable hash noise
> while in the receive mode with any bandwidth centered
> around 28.000 MHz to 28.050 MHz. And, it is also
> present while tuning RIT. It sounds like synthesizer
> switching noise and its repetition rate increses when the
> VFO is set to fine
> tuning. I do not hear it on any other band. I also
> don't hear it over the entire 10 meter band, just the region
> as stated.
>
> Is this in other K3s or is there something going on that
> needs attention in only my radio? I called factory
> tech support over a week ago. Since they have not come
> up with an answer it seemed time to open it up to a wider
> group of users.
>
> Thanks
>
> 73,
>
> John, W1QS
> ______________________________________________________________
> 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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Ken Wagner K3IU

Re: K3 VFO tuning hash

In reply to this post by john lawrence-3

Hi John:
I hear nothing except normal atmospheric noise and a birdie at 28004 and
28008(fast mover).Nothing that I can relate to "tuning."
73,
Ken K3IU
K3 #202
~~~~~~~~~~~~~~~~~~~~~~~~~~
John Lawrence wrote:

> Now that 6 and 10 meters have been open to Europe and Africa, I frequent
> these bands for the first time in the six months of owning a factory built K3 radio.
>
> What I've discovered and reported to factory tech support is a very noticable hash noise
> while in the receive mode with any bandwidth centered around 28.000 MHz to 28.050 MHz. And, it is also
> present while tuning RIT. It sounds like synthesizer switching noise and its repetition rate increses when the VFO is set to fine
> tuning. I do not hear it on any other band. I also don't hear it over the entire 10 meter band, just the region as stated.
>
> Is this in other K3s or is there something going on that needs attention in only my radio? I called factory tech support over a week ago. Since they have not come up with an answer it seemed time to open it up to a wider group of users.
>
> Thanks
>
> 73,
>
> John, W1QS
>
>

Dave Van Wallaghen

Re: K3 VFO tuning hash

In reply to this post by john lawrence-3

John, I just noticed the same thing on 10m the other day. If I used the finger dimple, I could hear it. But if I used the outer rubber ring with 1 or more fingers it would not be nearly as noticable.

I was operating portable in my yard with around 150' of extension cord to power my Gamma PS.

I thought about searching the archives for something about this. Funny you should mention it.

73,
Dave W8FGU

-----Original Message-----
From: John Lawrence <[hidden email]>

Date: Fri, 26 Jun 2009 17:20:59
To: <[hidden email]>
Subject: [Elecraft] K3 VFO tuning hash

Now that 6 and 10 meters have been open to Europe and Africa, I frequent
these bands for the first time in the six months of owning a factory built K3 radio.

What I've discovered and reported to factory tech support is a very noticable hash noise
while in the receive mode with any bandwidth centered around 28.000 MHz to 28.050 MHz. And, it is also
present while tuning RIT. It sounds like synthesizer switching noise and its repetition rate increses when the VFO is set to fine
tuning. I do not hear it on any other band. I also don't hear it over the entire 10 meter band, just the region as stated.

Is this in other K3s or is there something going on that needs attention in only my radio? I called factory tech support over a week ago. Since they have not come up with an answer it seemed time to open it up to a wider group of users.

Thanks

73,

John, W1QS
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john lawrence-3

Re: K3 VFO tuning hash

In reply to this post by john lawrence-3

Cookie

Thanks for you response. I have this noise into an open, short and 50 ohm load. I believe it's coming from the K3 itself. If you study how a synthesiser works with it's phase locked circuitry, it's highly likely to be the source. However, I haven't don a scope probe on the output of the circuit to know for sure.

73,

John W1QS, ex N6JL

On Jun 26, 2009, [hidden email] wrote:

John, I spend a lot of time on ten and a fair amount on six. I usually operate CW with most of my activity around 28.05. I hear some noise on ten meters occasionally when the band opens which I attribute to broad band interference coming in on skip. It varies with beam heading, but not with any tuning parameters. I have speculated that it may be a Broad Band over Power Line artifact, but I can't confirm that. Does your noise go away if you switch to a dummy load, or change your beam heading?

Willis 'Cookie' Cooke
K5EWJ

--- On Fri, 6/26/09, John Lawrence <[hidden email]> wrote:

John N1JM

Re: K3 VFO tuning hash

In reply to this post by john lawrence-3

I hear it too, but it's pretty low and hardly at all if at all in narrow cw mode.

John N1JM

hb9ari@bluewin.ch

Re: K3 VFO tuning hash

In reply to this post by Dave Van Wallaghen

Dave,

Same noise here (K3#1212) near 28MHz.
May be related to encoder transitions spectrum
falling around this frequency?
With a noise level corresponding to S1 (no antenna),
the VFO tuning noise is peaking to S2;
with antenna, (S4 noise) the tuning noise
is just audible and no Smeter level modification.

73 QRO de Rudolf, HB9ARI

Dave Van Wallaghen wrote:

> John, I just noticed the same thing on 10m the other day. If I used the finger dimple, I could hear it. But if I used the outer rubber ring with 1 or more fingers it would not be nearly as noticable.
>
> I was operating portable in my yard with around 150' of extension cord to power my Gamma PS.
>
> I thought about searching the archives for something about this. Funny you should mention it.
>
> 73,
> Dave W8FGU
>
>
> -----Original Message-----
> From: John Lawrence <[hidden email]>
>
> Date: Fri, 26 Jun 2009 17:20:59
> To: <[hidden email]>
> Subject: [Elecraft] K3 VFO tuning hash
>
>
> Now that 6 and 10 meters have been open to Europe and Africa, I frequent
> these bands for the first time in the six months of owning a factory built K3 radio.
>
> What I've discovered and reported to factory tech support is a very noticable hash noise
> while in the receive mode with any bandwidth centered around 28.000 MHz to 28.050 MHz. And, it is also
> present while tuning RIT. It sounds like synthesizer switching noise and its repetition rate increses when the VFO is set to fine
> tuning. I do not hear it on any other band. I also don't hear it over the entire 10 meter band, just the region as stated.
>
> Is this in other K3s or is there something going on that needs attention in only my radio? I called factory tech support over a week ago. Since they have not come up with an answer it seemed time to open it up to a wider group of users.
>
> Thanks
>
> 73,
>
> John, W1QS
> ______________________________________________________________
> 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
>
>
>

WILLIS COOKE

Re: K3 VFO tuning hash

In reply to this post by john lawrence-3

Be sure you are not listening to free bander buckshot. I hear a lot of freebanding which seems to come from Mexico or Central America. Sometimes it is noise, sometimes carriers and sometimes voice. The voice is in Spanish usually and the carriers come and go like several stations using AM. It doesn't coincide with tuning or go away when you monitor a frequency, but you will of course hear more it it when you are tuning.

Willis 'Cookie' Cooke
K5EWJ

--- On Sat, 6/27/09, hb9ari <[hidden email]> wrote:

> From: hb9ari <[hidden email]>
> Subject: Re: [Elecraft] K3 VFO tuning hash
> To: "Elecraft" <[hidden email]>
> Date: Saturday, June 27, 2009, 12:29 AM
> Dave,
>
> Same noise here (K3#1212) near 28MHz.
> May be related to encoder transitions spectrum
> falling around this frequency?
> With a noise level corresponding to S1 (no antenna),
> the VFO tuning noise is peaking to S2;
> with antenna, (S4 noise) the tuning noise
> is just audible and no Smeter level modification.
>
> 73 QRO de Rudolf, HB9ARI
>
> Dave Van Wallaghen wrote:
> > John, I just noticed the same thing on 10m the other
> day. If I used the finger dimple, I could hear it. But if I
> used the outer rubber ring with 1 or more fingers it would
> not be nearly as noticable.
> >
> > I was operating portable in my yard with around 150'
> of extension cord to power my Gamma PS.
> >
> > I thought about searching the archives for something
> about this. Funny you should mention it.
> >
> > 73,
> > Dave W8FGU
> >
> >
> > -----Original Message-----
> > From: John Lawrence <[hidden email]>
> >
> > Date: Fri, 26 Jun 2009 17:20:59
> > To: <[hidden email]>
> > Subject: [Elecraft] K3 VFO tuning hash
> >
> >
> > Now that 6 and 10 meters have been open to Europe and
> Africa, I frequent
> > these bands for the first time in the six months of
> owning a factory built K3 radio.
> >
> > What I've discovered and reported to factory tech
> support is a very noticable hash noise
> > while in the receive mode with any bandwidth centered
> around 28.000 MHz to 28.050 MHz. And, it is also
> > present while tuning RIT. It sounds like
> synthesizer switching noise and its repetition rate increses
> when the VFO is set to fine
> > tuning. I do not hear it on any other band. I
> also don't hear it over the entire 10 meter band, just the
> region as stated.
> >
> > Is this in other K3s or is there something going on
> that needs attention in only my radio? I called
> factory tech support over a week ago. Since they have
> not come up with an answer it seemed time to open it up to a
> wider group of users.
> >
> > Thanks
> >
> > 73,
> >
> > John, W1QS
> >
> ______________________________________________________________
> > 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
> >
> >
> >
> ______________________________________________________________
> Elecraft mailing list
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>
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>

Bob Garrett

Re: K3 VFO tuning hash

Willis et al,

I raised this issue several months ago and this is my
response from Elecraft Support. Believe me, it is a real issue definitely
on 6 meters.
Hi Bob,
This is a known issue and Wayne is working with another engineer on how the
noise
might be reduced or eliminated.
--
73, Gary AB7MY (returning from email server crash)
=========
[hidden email]
Elecraft Technical Support
Bob Garrett wrote:
Greetings Elecraft Support,
Here is the situation. Today, I
> hooked up my PR6
> and 6 meter beam to my K3. What I noticed is that when I tuned across
> the band,
> I can hear the decoder. This happens with both the main and sub RX. It
> sounds
like a lot of clicks. I can also

> hear it with
> the antenna disconnected. No problems on any other bands.
> Wow, this is such a fun radio. I'm just so enjoying operating. I
> really have grown
> to appreciate it even more this weekend chasing the K5D DXpedition.
> Any assistance or insight appreciated.
> 73, Bob K3UL
> ------------------------------------------------------------------------
>
>
> No virus found in this incoming message.
> Checked by AVG -

www.avg.com
> Version: 8.0.237 / Virus Database: 270.10.23/1953 - Release Date: 02/14/09
> 18:01:00
>
>

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DaveL G3TJP

Re: K3 VFO tuning hash

In reply to this post by john lawrence-3

On my K3 #1122, I hear hash around 5MHz and a few other places on the bands, but it
is only noticeable if I am rotating the tuning knob quickly. If I'm looking for signals, I'm
turning the knob more slowly am not aware of hash. Even if it is there, reproduced as
individual pops, it has gone unnoticed.

So:

1. Hash is definitely present on my K3 and is most definitely NOT something received off-air.

2. So far, it hasn't bothered me.

3. Owing to 2, I don't recall where else I've heard it, other than at the 5MHz boundary when
tuning quickly.

73 all. Dave, G3TJP
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G3TCT

Re: K3 VFO tuning hash

In reply to this post by john lawrence-3

This noise was previously reported under the title "K3 Tuning encoder pulses
and birdie problem"
In my case it is only noticeable at the low end of 28MHz when there is a low
noise level from the antenna or with a dummy load attached.
Wayne suggested using the noise blanker on a low setting like t1-5, also
tightening screws and tmp cables may help. In my case it seemed to get
better when I installed the KRX3, but maybe cos I tightened up the screws
and cables.
HTH
Graham

----- Original Message -----
From: "John Lawrence" <[hidden email]>
.
> What I've discovered and reported to factory tech support is a very
noticable hash noise while in the receive mode with any bandwidth centered
around 28.000 MHz to 28.050 MHz.

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john lawrence-3

Re: K3 VFO tuning hash

In reply to this post by john lawrence-3

Graham

I value your input on my VFO hash issue. Of all the responses yours seems to best match my situation.

I bought my radio factory built and have never been into it. When I retired last year, I meant it. I bought this K3 in December
hoping not to ever open any more radios. I prefer the operating and doing the antenna builting part of the hobby. The last two years of work were with the Motorola VHF/UHF CDMs and their Canopy microwave radios and that was to be the end of tweaking the inner parts of the circuits. Programing radios is fine but dealing with surface mount boards and their interconnects requires more lab than I have here at home.

I guess I will wait for solid factory direction before I venture inside for the first time. You know, having not built my K3 leaves me at quite a disadvantage if I should start now by dealing with the inside workings of the radio.

I've seen this kind of noise on early radios. It makes sense that a optical encoder digital device on the VFO knob would generate this kind of pulse noise. I gather that the RIT knob is also an encoder too. But why is it only showing up on the low end of 10 meters? Maybe some ferrite chokes on the ribbon cable/wires would suppress the emission?

Thanks again....

73,

John, W1QS

On Jun 27, 2009, [hidden email] wrote:
This noise was previously reported under the title "K3 Tuning encoder pulses
and birdie problem"
In my case it is only noticeable at the low end of 28MHz when there is a low
noise level from the antenna or with a dummy load attached.
Wayne suggested using the noise blanker on a low setting like t1-5, also
tightening screws and tmp cables may help. In my case it seemed to get
better when I installed the KRX3, but maybe cos I tightened up the screws
and cables.
HTH
Graham

----- Original Message -----
From: "John Lawrence" <[hidden email]>
.
> What I've discovered and reported to factory tech support is a very
noticable hash noise while in the receive mode with any bandwidth centered
around 28.000 MHz to 28.050 MHz.

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K2QI

Re: K3 VFO tuning hash

In reply to this post by G3TCT

I had a similar issue, except my encoder noise was most noticeable around
5MHz. After testing and discussions with Wayne, it appears to be due to
"hot synthesizers."

I do not notice this problem in the 6m band.

73 de James K2QI

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of Graham Kimbell
(G3TCT)
Sent: Saturday, June 27, 2009 1:31 PM
To: John Lawrence; Elecraft reflector
Subject: Re: [Elecraft] K3 VFO tuning hash

This noise was previously reported under the title "K3 Tuning encoder pulses
and birdie problem"
In my case it is only noticeable at the low end of 28MHz when there is a low
noise level from the antenna or with a dummy load attached.
Wayne suggested using the noise blanker on a low setting like t1-5, also
tightening screws and tmp cables may help. In my case it seemed to get
better when I installed the KRX3, but maybe cos I tightened up the screws
and cables.
HTH
Graham

----- Original Message -----
From: "John Lawrence" <[hidden email]>
.
> What I've discovered and reported to factory tech support is a very
noticable hash noise while in the receive mode with any bandwidth centered
around 28.000 MHz to 28.050 MHz.

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--... ...-- -.. . .--- .- -- . ...

K2QI

Re: K3 VFO tuning hash

In reply to this post by DaveL G3TJP

Hi Dave,

I've gone through this issue with Wayne and Aptos as well. My hash is
registers approximately S3-S5 around 5Mhz. According to Wayne, the
synthesizers may be "hot". I do not notice this problem anywhere else and
since I usually don't operate around 5Mhz, it's gone unnoticed for some
time.

73 de James K2QI

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of David Lankshear
Sent: Saturday, June 27, 2009 10:16 AM
To: [hidden email]
Subject: Re: [Elecraft] K3 VFO tuning hash

On my K3 #1122, I hear hash around 5MHz and a few other places on the bands,
but it
is only noticeable if I am rotating the tuning knob quickly. If I'm looking
for signals, I'm
turning the knob more slowly am not aware of hash. Even if it is there,
reproduced as
individual pops, it has gone unnoticed.

So:

1. Hash is definitely present on my K3 and is most definitely NOT something
received off-air.

2. So far, it hasn't bothered me.

3. Owing to 2, I don't recall where else I've heard it, other than at the
5MHz boundary when
tuning quickly.

73 all. Dave, G3TJP
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--... ...-- -.. . .--- .- -- . ...

gm3sek

Re: K3 VFO tuning hash

In reply to this post by K2QI

James Sarte wrote:
>I had a similar issue, except my encoder noise was most noticeable
>around 5MHz. After testing and discussions with Wayne, it appears to
>be due to "hot synthesizers."
>
>I do not notice this problem in the 6m band.
>

I notice it sometimes while tuning the bottom 50kHz of 6m for beacons.
The sound is like sawing wood, but is only present while actually
rotating the VFO knob.

It also seems to depend on other settings of the rig because sometimes
it isn't audible at all while tuning, or is much weaker.

--

73 from Ian GM3SEK
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wayne burdick

Re: K3 VFO tuning hash

Administrator

In reply to this post by john lawrence-3

John,

I've noted your report of VFO tuning noise on 10 m, and will look into
it further when I get back from vacation. Sounds like re-radiation of
SPI bus tuning data, and this could be frequency specific. It might
also vary with the type of antenna, ground, and other I/O devices
connected to the rig. Usually atmospheric noise masks any digital
switching noise, which is typically at an extremely low level.

As Graham noted, a temporary workaround might be to use the DSP noise
blanker, set to something like t1-5. This will have virtually no
impact on normal signals, and is applied post-crystal filter so it
can't cause wideband IMD. The DSP NB is quite good at removing low-
level, high rise-time signals. NB settings are stored per-band, and
you can also save the on/off status on a per-band basis by setting
CONFIG:NB SAVE to YES.

73,
Wayne
N6KR

> On Jun 27, 2009, [hidden email] wrote:

> This noise was previously reported under the title "K3 Tuning
> encoder pulses and birdie problem"
> In my case it is only noticeable at the low end of 28MHz when there
> is a low noise level from the antenna or with a dummy load attached.

> Wayne suggested using the noise blanker on a low setting like t1-5,
> also tightening screws and tmp cables may help. In my case it
> seemed to get better when I installed the KRX3, but maybe cos I
> tightened up the screws and cables.
> HTH
> Graham

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GW0ETF

Re: K3 VFO tuning hash

Wayne et al,

I too can confirm the existence of what intuitively sounds like encoder clicks on the bottom end of 10m as well as the lower ends of 15 and 6m. Most times they are masked by antenna noise (and some pc low level hash here on 6...!) but it does seem to vary in 'severity' so I was interested in your comments about I/O devices etc. The bottom end of 10 does seem consistently the worst though.

A couple of observations from here:-

1/ When switched on both RIT and SUB encoders produce clicks.
2/ The Main encoder produces clicks also in the SUB rx and vice versa.
3/ SHIFT/LO and HI/WIDTH controls also produce clicks.

DSP helps and ofcourse it doesn't ultimately interfere with a qso. I've only noticed this since using 10m and then not all the time and I've yet to double check the mechanics/wiring inside the radio.

73,

Stewart Rolfe, GW0ETF

K3 #145 (V3.19 and pretty well modded up to date)

wayne burdick wrote

John,

I've noted your report of VFO tuning noise on 10 m, and will look into
it further when I get back from vacation. Sounds like re-radiation of
SPI bus tuning data, and this could be frequency specific. It might
also vary with the type of antenna, ground, and other I/O devices
connected to the rig. Usually atmospheric noise masks any digital
switching noise, which is typically at an extremely low level.

hb9ari@bluewin.ch

Re: K3 VFO tuning hash

Hello,

I was totally in error when i thought it was an encoder generated noise.
I'm 100% ok with an internal (SPI?) bus generated noise;
i've just tested around 28.005MHz but with PowerSDR
tuning instead of VFO knob; the noise is there but
disappear when no frequency change.

73 QRO fr Rudolf, HB9ARI

GW0ETF wrote:

> Wayne et al,
>
> I too can confirm the existence of what intuitively sounds like encoder
> clicks on the bottom end of 10m as well as the lower ends of 15 and 6m. Most
> times they are masked by antenna noise (and some pc low level hash here on
> 6...!) but it does seem to vary in 'severity' so I was interested in your
> comments about I/O devices etc. The bottom end of 10 does seem consistently
> the worst though.
>
> A couple of observations from here:-
>
> 1/ When switched on both RIT and SUB encoders produce clicks.
> 2/ The Main encoder produces clicks also in the SUB rx and vice versa.
> 3/ SHIFT/LO and HI/WIDTH controls also produce clicks.
>
> DSP helps and ofcourse it doesn't ultimately interfere with a qso. I've only
> noticed this since using 10m and then not all the time and I've yet to
> double check the mechanics/wiring inside the radio.
>
> 73,
>
> Stewart Rolfe, GW0ETF
>
> K3 #145 (V3.19 and pretty well modded up to date)
>
>
> wayne burdick wrote:
>
>> John,
>>
>> I've noted your report of VFO tuning noise on 10 m, and will look into
>> it further when I get back from vacation. Sounds like re-radiation of
>> SPI bus tuning data, and this could be frequency specific. It might
>> also vary with the type of antenna, ground, and other I/O devices
>> connected to the rig. Usually atmospheric noise masks any digital
>> switching noise, which is typically at an extremely low level.
>>
>>
>>
>>
>
>

dj7mgq

Re: K3 VFO tuning hash

In reply to this post by john lawrence-3

Hi John and the List,

> What I've discovered and reported to factory tech support is a very
> noticable hash noise while in the receive mode with any bandwidth
> centered around 28.000 MHz to 28.050 MHz. And, it is also present
> while tuning RIT.

I noticed something like this after adding the secondary receiver to my
K3 many months ago.

At least in my case, the actual physical layout (routing) of the cables
to and from the synthesizers, the reference and the receivers turned out
to be critical and rather touchy. After a fair amount of fiddling I
managed to reduce the hash to a point where it was below the noise level
from the antenna on a quite, inactive band.

Apparently something was coupling into and then elsewhere out of the
shields of the coax wiring around the synthesizers. If I remember
correctly, the smallish knob for the secondary RX was worse than the big
main knob, and when the two receivers were tracking the hash was much
stronger then when they weren't

Because I do not do 5MHz or 50MHz, I can't really comment about these bands.

vy 73 de toby
--
DD5FZ (ex 4n6fz, dj7mgq, dg5mgq, dd5fz)
K2 #885, K2/100 #3248, K3/100 #67
DOK C12, BCC, DL-QRP-AG

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john lawrence-3

Re: K3 VFO tuning hash

In reply to this post by john lawrence-3

Toby

Thanks for your thoughts and experience with the subject at hand.

Wayne is on vacation and will take up the matter upon return.

I will keep you message as a reference once we take it up again

73,

John, W1QS

On Jun 28, 2009, [hidden email] wrote:
Hi John and the List,

> What I've discovered and reported to factory tech support is a very
> noticable hash noise while in the receive mode with any bandwidth
> centered around 28.000 MHz to 28.050 MHz. And, it is also present
> while tuning RIT.

I noticed something like this after adding the secondary receiver to my
K3 many months ago.

At least in my case, the actual physical layout (routing) of the cables
to and from the synthesizers, the reference and the receivers turned out
to be critical and rather touchy. After a fair amount of fiddling I
managed to reduce the hash to a point where it was below the noise level
from the antenna on a quite, inactive band.

Apparently something was coupling into and then elsewhere out of the
shields of the coax wiring around the synthesizers. If I remember
correctly, the smallish knob for the secondary RX was worse than the big
main knob, and when the two receivers were tracking the hash was much
stronger then when they weren't

Because I do not do 5MHz or 50MHz, I can't really comment about these bands.

vy 73 de toby
--
DD5FZ (ex 4n6fz, dj7mgq, dg5mgq, dd5fz)
K2 #885, K2/100 #3248, K3/100 #67
DOK C12, BCC, DL-QRP-AG

______________________________________________________________
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