Re: [Elecraft] Band pass filters

[Morgan Bailey]

When you buy RA6LBS filters each comes with a tracing by a spectrum
analyzer showing the exact filter characteristics. On each of these that I
own the tracing matches the Rigol with tracking generator. They really work
well. I have a complete set of 500 watt filters from RA6LBS. They are sold
by DXengineering. My other set is VA6AM they also provide 80 to 100 dB of
rejection with a 3500 watt rating. The cost of those filters with switch,
multiplexers and cabling is more expensive than many people have invested
in their radio alone.

In conclusion, investing in a heavy duty set of filters is cheaper than
blowing up a radio. Plus, it gives one more options.

73, Morgan NJ8M
BS + MS + $2.98 = COFFEE
Real Life Experience = Priceless, says the man who set his back yard on
fire with a breadboard tuner loading a 160 meter inverted L with 1000
watts. LOL


On Tue, Jul 27, 2021 at 9:55 PM Jim Brown  wrote:

> On 7/27/2021 12:53 PM, Morgan Bailey wrote:
> > 80 to 100 dB band to band attenuation is necessary for a contest station.
>
> That depends a LOT on the radios and the amps.
>
> > Reviewing Contest University the RA6LBS talk from a few years ago is the
> > basis for this decision. He probably has the most experience in this
> field
> > beside that of VA6AM. Both make great filters. Just having a filter is
> not
> > enough. One needs a multiplexer in conjunction with the band pass filter
> to
> > get to that DB level. One could stack 2 band pass filters and attain
> > whatever is needed to get the job done. The multi switchable boxes that
> run
> > about 500 to 900 dollars only give about 30 to maybe 40 db of rejection.
>
> That also depends a LOT on the boxes, and some are far better than
> others. See this study I did about 8 years ago for National Contest
> Journal. http://k9yc.com/BandpassFilterSurvey.pdf Several of the units
> are 10-20 dB better than that.
>   It
> > is just not enough to keep the other radio quiet and SAFE from front in
> > overload and toasting the receiver circuits. I use transmitting band pass
> > filters rated at 3500 watts on the output of my amp.
>
> This is a very good way to do it. Most hams overlook the harmonics and
> IMD generated in power amps.
> This coupled with
> > multiplexers on 160/80/40 and 20/15/10 makes for a multi two or an SO2R
> > setup quiet on each radio. Between the multiplexer and associated band
> pass
> > filters I am able to run 1.5KW 160-10 with an antenna farm that takes up
> 68
> > linear feet total for 160-10. Additionally, 160/80/40 are vertical
> > polarized and 20/15/10 are horizontal polarized adding more rejection. It
> > works and works well.
> >
> > One problem that many stations on a small lot have is ignoring Common
> Mode
> > pick up off the shield of the coax. Grounding all shields before entering
> > the shack
>
> YES! AND seriously bonding everything in the shack and the building that
> contains it.
>
> and using 1:1 choke baluns is a necessary step to prevent
> > interstation interference.
>
> Yes, it's quite important to have a SERIOUS common mode choke at the
> feedpoint of EVERY antenna. http://k9yc.com/2018Cookbook.pdf
> >
> > Having radios with very low composite/Phase noise is necessary.
>
> YES!
>
> At the last Visalia DX Convention, gave an overview talk on a dozen or
> so mechanisms that contribute to inter-station interference, and how to
> minimize each. It's here. http://k9yc.com/Multi-Station.pdf
>
> And W2VJN's book on the subject is excellent.
>
> 73, Jim K9YC
> __
> 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 mbaileyc...@gmail.com
>
__
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 arch...@mail-archive.com 

Re: [Elecraft] Tecsun portables

[Jim Brown]

On 7/27/2021 2:17 PM, Louandzip wrote:

Spectrum display would be very useful.


Yes, spectrum display is QUITE useful.

73, Jim K9YC

__
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 arch...@mail-archive.com 

Re: [Elecraft] Band pass filters

[Jim Brown]

On 7/27/2021 12:53 PM, Morgan Bailey wrote:

80 to 100 dB band to band attenuation is necessary for a contest station.


That depends a LOT on the radios and the amps.


Reviewing Contest University the RA6LBS talk from a few years ago is the
basis for this decision. He probably has the most experience in this field
beside that of VA6AM. Both make great filters. Just having a filter is not
enough. One needs a multiplexer in conjunction with the band pass filter to
get to that DB level. One could stack 2 band pass filters and attain
whatever is needed to get the job done. The multi switchable boxes that run
about 500 to 900 dollars only give about 30 to maybe 40 db of rejection.


That also depends a LOT on the boxes, and some are far better than 
others. See this study I did about 8 years ago for National Contest 
Journal. http://k9yc.com/BandpassFilterSurvey.pdf Several of the units 
are 10-20 dB better than that.

 It

is just not enough to keep the other radio quiet and SAFE from front in
overload and toasting the receiver circuits. I use transmitting band pass
filters rated at 3500 watts on the output of my amp. 


This is a very good way to do it. Most hams overlook the harmonics and 
IMD generated in power amps.

This coupled with

multiplexers on 160/80/40 and 20/15/10 makes for a multi two or an SO2R
setup quiet on each radio. Between the multiplexer and associated band pass
filters I am able to run 1.5KW 160-10 with an antenna farm that takes up 68
linear feet total for 160-10. Additionally, 160/80/40 are vertical
polarized and 20/15/10 are horizontal polarized adding more rejection. It
works and works well.

One problem that many stations on a small lot have is ignoring Common Mode
pick up off the shield of the coax. Grounding all shields before entering
the shack 


YES! AND seriously bonding everything in the shack and the building that 
contains it.


and using 1:1 choke baluns is a necessary step to prevent
interstation interference. 


Yes, it's quite important to have a SERIOUS common mode choke at the 
feedpoint of EVERY antenna. http://k9yc.com/2018Cookbook.pdf


Having radios with very low composite/Phase noise is necessary. 


YES!

At the last Visalia DX Convention, gave an overview talk on a dozen or 
so mechanisms that contribute to inter-station interference, and how to 
minimize each. It's here. http://k9yc.com/Multi-Station.pdf


And W2VJN's book on the subject is excellent.

73, Jim K9YC
__
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 arch...@mail-archive.com 

[Elecraft] audio input level setting for FM packet

[Jim Weatherford via Elecraft]

I've recently started using my K3 with internal 2m transverter for accessing 
the local emergency communications packet BBS system. I know for sideband 
digital modes, the recommendation is for 4 bars with the 5th flickering. Does 
this also apply to FM? I want to make sure I achieve nearly full deviation 
without over deviating, but do not have test equipment to measure.
Also, any recommendations on a K3 compatible external transverter for 70cm are 
appreciated.
Jim, WU6K
__
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 arch...@mail-archive.com 

Re: [Elecraft] Band pass filters

[Paul GACEK via Elecraft]

David

I purchased blank PCBs from VA6AM along with the torroids with a view to 
building a switched filter set.

Still on my list of “want to do” and my motivation was driven by space 
reduction in my portable SO2R project.

However I’ve somewhat learnt the hard way to be honest with myself upfront on 
time and effort versus paying an arm and a leg for a commercial solution.

Paul

> On Jul 27, 2021, at 1:42 PM, CUTTER DAVID via Elecraft 
>  wrote:
> 
> Thanks all for the great advice and the further reading. 
> 
> In my specific case of K3S + KPA500 + KAT500, is there no room to reduce the 
> high performance W3NQM filters?
> 
> I understand common mode filters and have made good versions of these from 
> K9YC cookbook. They remain in circuit all the time, so that's easy, whilst 
> NQN filters have to be replaced for each band change, so, even I want to have 
> a quick peek at another band, it still takes minutes to swap around the 
> filters with the other station. It's a painful loss of time and prone to 
> getting it wrong. Building a lower specification filter set with relay 
> switching would be easier. 
> 
> David G3UNA
> 
> 
>> On 27 July 2021 at 20:53 Morgan Bailey  wrote:
>> 
>> 
>> 80 to 100 dB band to band attenuation is necessary for a contest station.
>> Reviewing Contest University the RA6LBS talk from a few years ago is the
>> basis for this decision. He probably has the most experience in this field
>> beside that of VA6AM. Both make great filters. Just having a filter is not
>> enough. One needs a multiplexer in conjunction with the band pass filter to
>> get to that DB level. One could stack 2 band pass filters and attain
>> whatever is needed to get the job done. The multi switchable boxes that run
>> about 500 to 900 dollars only give about 30 to maybe 40 db of rejection. It
>> is just not enough to keep the other radio quiet and SAFE from front in
>> overload and toasting the receiver circuits. I use transmitting band pass
>> filters rated at 3500 watts on the output of my amp. This coupled with
>> multiplexers on 160/80/40 and 20/15/10 makes for a multi two or an SO2R
>> setup quiet on each radio. Between the multiplexer and associated band pass
>> filters I am able to run 1.5KW 160-10 with an antenna farm that takes up 68
>> linear feet total for 160-10. Additionally, 160/80/40 are vertical
>> polarized and 20/15/10 are horizontal polarized adding more rejection. It
>> works and works well.
>> 
>> One problem that many stations on a small lot have is ignoring Common Mode
>> pick up off the shield of the coax. Grounding all shields before entering
>> the shack and using 1:1 choke baluns is a necessary step to prevent
>> interstation interference.
>> 
>> Having radios with very low composite/Phase noise is necessary. I use
>> FTDX101 radios in the shack. If radios are noisy and they raise the noise
>> floor of the other radio during reception, about the only solution is to
>> get a new radio that is clean on the output. Check out the Sherwood
>> engineering pages for those ratings. While you are there, one may want to
>> check out the ratings of ADC front ends vs Superhet front ends.Hybrid
>> superhet/ADC front end receivers seem to be the best choice for this
>> environment at the moment. RMDR and Close in blocking dynamic range are the
>> magic numbers to review.
>> 
>> 73, Morgan Bailey NJ8M
>> 
>> BS + MS + $2.98 = COFFEE
>> Real Life Experience = Priceless, says the man who set his back yard on
>> fire with a breadboard tuner loading a 160 meter inverted L with 1000
>> watts. LOL
>> 
>> 
>>> On Tue, Jul 27, 2021 at 1:52 PM David Hachadorian 
>>> wrote:
>>> 
>>> You need a filter on the TX radio to prevent its phase noise from being
>>> heard on other bands.  Just pressing PTT on the TX radio, even without
>>> putting out any measurable power, will raise the noise floor on multiple
>>> bands. With suitable band decoders driving filter selection,
>>> fast-switching between bands is possible.
>>> 
>>> Dave Hachadorian, K6LL
>>> Yuma, AZ
>>> 
>>> 
>>> On 7/27/2021 9:09 AM, CUTTER DAVID via Elecraft wrote:
 Given the improved performance of modern transceivers, is there still a
>>> call for high specification W3NQN band pass filters in a 2-transmitter
>>> station?  For example on a Multi-2 contest environment.  For instance K3S +
>>> KPA + KAT. The filter fitted between radio and amplifier.
 
 I have the *feeling* that a receive-only filter (with tx bypass) might
>>> be all that is needed.  This is much easier to implement than a full
>>> transmitter-rated set making fast switching between bands (eg for a quick
>>> look around) very quick and easy from the keyboard, etc.
 
 David G3UNA
> __
> 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 h

Re: [Elecraft] Band pass filters

[CUTTER DAVID via Elecraft]

Thanks all for the great advice and the further reading. 

In my specific case of K3S + KPA500 + KAT500, is there no room to reduce the 
high performance W3NQM filters?

I understand common mode filters and have made good versions of these from K9YC 
cookbook. They remain in circuit all the time, so that's easy, whilst NQN 
filters have to be replaced for each band change, so, even I want to have a 
quick peek at another band, it still takes minutes to swap around the filters 
with the other station. It's a painful loss of time and prone to getting it 
wrong. Building a lower specification filter set with relay switching would be 
easier. 

David G3UNA


> On 27 July 2021 at 20:53 Morgan Bailey  wrote:
> 
> 
> 80 to 100 dB band to band attenuation is necessary for a contest station.
> Reviewing Contest University the RA6LBS talk from a few years ago is the
> basis for this decision. He probably has the most experience in this field
> beside that of VA6AM. Both make great filters. Just having a filter is not
> enough. One needs a multiplexer in conjunction with the band pass filter to
> get to that DB level. One could stack 2 band pass filters and attain
> whatever is needed to get the job done. The multi switchable boxes that run
> about 500 to 900 dollars only give about 30 to maybe 40 db of rejection. It
> is just not enough to keep the other radio quiet and SAFE from front in
> overload and toasting the receiver circuits. I use transmitting band pass
> filters rated at 3500 watts on the output of my amp. This coupled with
> multiplexers on 160/80/40 and 20/15/10 makes for a multi two or an SO2R
> setup quiet on each radio. Between the multiplexer and associated band pass
> filters I am able to run 1.5KW 160-10 with an antenna farm that takes up 68
> linear feet total for 160-10. Additionally, 160/80/40 are vertical
> polarized and 20/15/10 are horizontal polarized adding more rejection. It
> works and works well.
> 
> One problem that many stations on a small lot have is ignoring Common Mode
> pick up off the shield of the coax. Grounding all shields before entering
> the shack and using 1:1 choke baluns is a necessary step to prevent
> interstation interference.
> 
> Having radios with very low composite/Phase noise is necessary. I use
> FTDX101 radios in the shack. If radios are noisy and they raise the noise
> floor of the other radio during reception, about the only solution is to
> get a new radio that is clean on the output. Check out the Sherwood
> engineering pages for those ratings. While you are there, one may want to
> check out the ratings of ADC front ends vs Superhet front ends.Hybrid
> superhet/ADC front end receivers seem to be the best choice for this
> environment at the moment. RMDR and Close in blocking dynamic range are the
> magic numbers to review.
> 
> 73, Morgan Bailey NJ8M
> 
> BS + MS + $2.98 = COFFEE
> Real Life Experience = Priceless, says the man who set his back yard on
> fire with a breadboard tuner loading a 160 meter inverted L with 1000
> watts. LOL
> 
> 
> On Tue, Jul 27, 2021 at 1:52 PM David Hachadorian 
> wrote:
> 
> > You need a filter on the TX radio to prevent its phase noise from being
> > heard on other bands.  Just pressing PTT on the TX radio, even without
> > putting out any measurable power, will raise the noise floor on multiple
> > bands. With suitable band decoders driving filter selection,
> > fast-switching between bands is possible.
> >
> > Dave Hachadorian, K6LL
> > Yuma, AZ
> >
> >
> > On 7/27/2021 9:09 AM, CUTTER DAVID via Elecraft wrote:
> > > Given the improved performance of modern transceivers, is there still a
> > call for high specification W3NQN band pass filters in a 2-transmitter
> > station?  For example on a Multi-2 contest environment.  For instance K3S +
> > KPA + KAT. The filter fitted between radio and amplifier.
> > >
> > > I have the *feeling* that a receive-only filter (with tx bypass) might
> > be all that is needed.  This is much easier to implement than a full
> > transmitter-rated set making fast switching between bands (eg for a quick
> > look around) very quick and easy from the keyboard, etc.
> > >
> > > David G3UNA
__
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 arch...@mail-archive.com 

Re: [Elecraft] Band pass filters

[Dave]

Bird makes a very good bandpass filter for the SDR radio you are 
speaking of...  It gets rid of ALL phase noise on all bands at once.


73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist, RFI
ARRL Asst. Director, NW Division, Technical Resources

On 7/27/21 12:50 PM, Bill Steffey NY9H wrote:

well said

at field day  that famous SDR, very reasonably priced, abundant with 
features DID INDEED SPREAD wide band noise ..it was on 10 and wiped out 
all thru 80 meters on three other radios  of various makes. ( mine was a 
k3) ...


maybe all we needed was to have bandpass filters for THAT radio ... but 
4 band of good filters starts to move into the purchase price of that radio


   Sherwood has spoken of this...and hope he will be elaborating ...  as 
I hate being the bearer of bad news



bill ny9h


On 7/27/2021 2:49 PM, David Hachadorian wrote:
You need a filter on the TX radio to prevent its phase noise from 
being heard on other bands.  Just pressing PTT on the TX radio, even 
without putting out any measurable power, will raise the noise floor 
on multiple bands. With suitable band decoders driving filter 
selection, fast-switching between bands is possible.


Dave Hachadorian, K6LL
Yuma, AZ


On 7/27/2021 9:09 AM, CUTTER DAVID via Elecraft wrote:
Given the improved performance of modern transceivers, is there still 
a call for high specification W3NQN band pass filters in a 
2-transmitter station?  For example on a Multi-2 contest 
environment.  For instance K3S + KPA + KAT. The filter fitted between 
radio and amplifier.


I have the *feeling* that a receive-only filter (with tx bypass) 
might be all that is needed.  This is much easier to implement than a 
full transmitter-rated set making fast switching between bands (eg 
for a quick look around) very quick and easy from the keyboard, etc.


David G3UNA
__
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 k6ll.d...@gmail.com
.



__
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 d...@nk7z.net

__
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 arch...@mail-archive.com 

Re: [Elecraft] Band pass filters

[Morgan Bailey]

80 to 100 dB band to band attenuation is necessary for a contest station.
Reviewing Contest University the RA6LBS talk from a few years ago is the
basis for this decision. He probably has the most experience in this field
beside that of VA6AM. Both make great filters. Just having a filter is not
enough. One needs a multiplexer in conjunction with the band pass filter to
get to that DB level. One could stack 2 band pass filters and attain
whatever is needed to get the job done. The multi switchable boxes that run
about 500 to 900 dollars only give about 30 to maybe 40 db of rejection. It
is just not enough to keep the other radio quiet and SAFE from front in
overload and toasting the receiver circuits. I use transmitting band pass
filters rated at 3500 watts on the output of my amp. This coupled with
multiplexers on 160/80/40 and 20/15/10 makes for a multi two or an SO2R
setup quiet on each radio. Between the multiplexer and associated band pass
filters I am able to run 1.5KW 160-10 with an antenna farm that takes up 68
linear feet total for 160-10. Additionally, 160/80/40 are vertical
polarized and 20/15/10 are horizontal polarized adding more rejection. It
works and works well.

One problem that many stations on a small lot have is ignoring Common Mode
pick up off the shield of the coax. Grounding all shields before entering
the shack and using 1:1 choke baluns is a necessary step to prevent
interstation interference.

Having radios with very low composite/Phase noise is necessary. I use
FTDX101 radios in the shack. If radios are noisy and they raise the noise
floor of the other radio during reception, about the only solution is to
get a new radio that is clean on the output. Check out the Sherwood
engineering pages for those ratings. While you are there, one may want to
check out the ratings of ADC front ends vs Superhet front ends.Hybrid
superhet/ADC front end receivers seem to be the best choice for this
environment at the moment. RMDR and Close in blocking dynamic range are the
magic numbers to review.

73, Morgan Bailey NJ8M

BS + MS + $2.98 = COFFEE
Real Life Experience = Priceless, says the man who set his back yard on
fire with a breadboard tuner loading a 160 meter inverted L with 1000
watts. LOL


On Tue, Jul 27, 2021 at 1:52 PM David Hachadorian 
wrote:

> You need a filter on the TX radio to prevent its phase noise from being
> heard on other bands.  Just pressing PTT on the TX radio, even without
> putting out any measurable power, will raise the noise floor on multiple
> bands. With suitable band decoders driving filter selection,
> fast-switching between bands is possible.
>
> Dave Hachadorian, K6LL
> Yuma, AZ
>
>
> On 7/27/2021 9:09 AM, CUTTER DAVID via Elecraft wrote:
> > Given the improved performance of modern transceivers, is there still a
> call for high specification W3NQN band pass filters in a 2-transmitter
> station?  For example on a Multi-2 contest environment.  For instance K3S +
> KPA + KAT. The filter fitted between radio and amplifier.
> >
> > I have the *feeling* that a receive-only filter (with tx bypass) might
> be all that is needed.  This is much easier to implement than a full
> transmitter-rated set making fast switching between bands (eg for a quick
> look around) very quick and easy from the keyboard, etc.
> >
> > David G3UNA
> > __
> > 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 k6ll.d...@gmail.com
> > .
>
> --
> Dave Hachadorian, K6LL
> Big Bear Lake, AZ
>
> __
> 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 mbaileyc...@gmail.com
__
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 arch...@mail-archive.com 

Re: [Elecraft] Band pass filters

[Bill Steffey NY9H]

well said

at field day  that famous SDR, very reasonably priced, abundant with 
features DID INDEED SPREAD wide band noise ..it was on 10 and wiped out 
all thru 80 meters on three other radios  of various makes. ( mine was a 
k3) ...


maybe all we needed was to have bandpass filters for THAT radio ... but 
4 band of good filters starts to move into the purchase price of that radio


  Sherwood has spoken of this...and hope he will be elaborating ...  as 
I hate being the bearer of bad news



bill ny9h


On 7/27/2021 2:49 PM, David Hachadorian wrote:
You need a filter on the TX radio to prevent its phase noise from 
being heard on other bands.  Just pressing PTT on the TX radio, even 
without putting out any measurable power, will raise the noise floor 
on multiple bands. With suitable band decoders driving filter 
selection, fast-switching between bands is possible.


Dave Hachadorian, K6LL
Yuma, AZ


On 7/27/2021 9:09 AM, CUTTER DAVID via Elecraft wrote:
Given the improved performance of modern transceivers, is there still 
a call for high specification W3NQN band pass filters in a 
2-transmitter station?  For example on a Multi-2 contest 
environment.  For instance K3S + KPA + KAT. The filter fitted between 
radio and amplifier.


I have the *feeling* that a receive-only filter (with tx bypass) 
might be all that is needed.  This is much easier to implement than a 
full transmitter-rated set making fast switching between bands (eg 
for a quick look around) very quick and easy from the keyboard, etc.


David G3UNA
__
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 k6ll.d...@gmail.com
.



__
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 arch...@mail-archive.com 

Re: [Elecraft] Band pass filters

[David Hachadorian]

You need a filter on the TX radio to prevent its phase noise from being 
heard on other bands.  Just pressing PTT on the TX radio, even without 
putting out any measurable power, will raise the noise floor on multiple 
bands. With suitable band decoders driving filter selection, 
fast-switching between bands is possible.


Dave Hachadorian, K6LL
Yuma, AZ


On 7/27/2021 9:09 AM, CUTTER DAVID via Elecraft wrote:

Given the improved performance of modern transceivers, is there still a call 
for high specification W3NQN band pass filters in a 2-transmitter station?  For 
example on a Multi-2 contest environment.  For instance K3S + KPA + KAT. The 
filter fitted between radio and amplifier.

I have the *feeling* that a receive-only filter (with tx bypass) might be all 
that is needed.  This is much easier to implement than a full transmitter-rated 
set making fast switching between bands (eg for a quick look around) very quick 
and easy from the keyboard, etc.

David G3UNA
__
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 k6ll.d...@gmail.com
.


--
Dave Hachadorian, K6LL
Big Bear Lake, AZ

__
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 arch...@mail-archive.com 

Re: [Elecraft] Tecsun portables

[Jim Brown]

On 7/27/2021 8:17 AM, Mike Harris via Elecraft wrote:

Tecsun seem to be popular. Any suggestions which model?


The PL660 has the the AM aircraft band, which can be an advantage in 
direction finding. They are fine radios.


73, Jim K9YC
__
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 arch...@mail-archive.com 

Re: [Elecraft] Tecsun portables

[David Hachadorian]

I use a Tecsun PL-660 for RFI tracking.  It is very sensitive, and has 
two steps of attenuation.  It has a jack for an external antenna, which 
disables the built-in whip. Frequency coverage is good.  It has a BFO, 
which is helpful in listening to certain types of noise.  It has a 
headphone jack which is good for a noisy outdoor environment.  I use 
alkaline batteries, and battery life is very good.  In the AM band, the 
built-in ferrite antenna is very directional.  I've never wished for a 
feature that it did not have.


Dave Hachadorian,
Yuma, AZ


On 7/27/2021 8:17 AM, Mike Harris via Elecraft wrote:

Hi,

Looking to replace my dead SW portable often used for RFI tracking.

Tecsun seem to be popular. Any suggestions which model?

Regards,

Mike VP8NO
__
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 k6ll.d...@gmail.com 


--
Dave Hachadorian, K6LL
Big Bear Lake, AZ

__
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 arch...@mail-archive.com 

[Elecraft] High SWR on KPA500

[Jerome Svinicki]

I have noticed that the SWR reading on one of my two KPA500s will show almost 
1.8:1 while the KAT500 show 1:1.  My other KPA500 does not exhibit this 
behavior.

   It would seem to me that if the KAT500 has tuned out the SWR and 
indicates a 1 to 1 match then the KPA-500 should also show a low SWR.

  And as I said my other KPA500 when I put it in-line with the same cables does 
not have this SWR inconsistent with the KAT-500.

  Do you have any ideas of something I can look for?

  73's  /Jerome /K8LF
__
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 arch...@mail-archive.com 

[Elecraft] Band pass filters

[Michael Carter]

David,

One need not have a "feeling" about the necessity
of band pass filters.  In addition to the concerns
that Paul cited about isolation between ports
in a triplexer or internal antenna port isolation
in a transceiver, there are analytical methods
to determine susceptibility to receiver damage
and IMD.

A receive-only bandpass filter, whether external
or internal, must suppress the fundamental frequency
of the other TX in a M/2 station sufficiently to prevent overload
and IMD generation.  Do a calculation: TX power (dBW or
dBm) minus band pass filter attenuation in its stop band
at the other TX frequency equals worst case RX input
power due to other TX (obviously RX antenna proximity,
orientation, and sensitivity reduction out of band
also reduce unwanted fundamental TX signal).

The receive-only band pass filter cannot attenuate
the in-band harmonic of the other TX.  One can
estimate the harmonic level, say in a 40 meter/20
meter M/2 setup, using the transceiver and amplifier
manufacturers' specifications.  If that level is at most
equivalent to a strong distant station's received signal
power, then it is likely of no greater concern than
those loud stations.  A 1500 watt amplifier that just
meets the FCC's spurious emission limit at its
2nd harmonic (43 dB or greater attenuation relative
to fundamental) yields approximately +19 dBm
at the TX antenna input.  In-band harmonic level
at the other M/2 receiver again depends on antenna
factors, but those factors combined would need to
provide another ~70 dB of attenuation of the TX
harmonic just to produce an S9+20 dB interferer
from the other M/2 station.

73,
Mike, K8CN


__
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 arch...@mail-archive.com 

Re: [Elecraft] Frequency shifts of KX3 when selecting CW?

[David Olean]

Hello Paul,

I think you mean 700 Hz (not kHz) for the frequency.  You can set the 
pitch of the CW note on your radio to fit your own ears. Older rigs just 
picked a freq and you had to live with it. My old Kenwood TS-820S used 
an 800 Hz CW offset as did my later Ten Tec OMNI V (a great cw radio). I 
don't have a KX3 but I suspect it is like my K3. If you are getting 
older and, ahem, more refined, you might notice that you like a lower CW 
note. That can be set to your preference, so when  you tune to 14150.0  
on SSB, the dial will indicate the zero beat frequency where the SSB 
sounds most natural.  Switching to CW will adjust the oscillator 
frequency to produce the correct offset beatnote that you selected and 
the actual display frequency will be offset by that amount. If your 
favorite CW note is 700 Hz, then the dial will indicate 14.1507 or 
possibly 14149.3 depending on CW or CW REVERSE buttons.


To make sure that you are correctly positioned for a QSO, you can hit 
the SPOT button. This will produce a tone that is equal to your CW note 
preference. You can easily compare the other station's CW note with the 
SPOT note and adjust your VFO until they sound the same. Human ears are 
good at comparing tone differences easily to 1 Hz or so. When it sounds 
equal, you are properly positioned on the exact same frequency as the 
station you are calling.


The new rigs are wonderful when compared to how things were in say 1960 
or so. There was a reason novices hung QSL cards on their wall. A 
contact was an almost rare occurrence! Now we quibble over a few Hz!


Dave K1WHS

On 7/27/2021 5:09 AM, Paul Jewell wrote:
I have this behaviour on my Yaesu Ft-897. If I set the CW modulation 
to 700 kHz, then it will move to 1.700 MHz. I thought this was 
"normal" behaviour, and I was afraid to ask about it (relatively new 
ham). I haven't tried to do the same on my KX3, but I will get it out 
and try it.


I don't think this is due to dropping it - I think it is intentional 
to give you the correct tone for CW.


Rgds.,
Paul

On 26/07/2021 19:05, Tom wrote:

Hi
I don't recall this happening before, but if I am tuned to a signal 
lets say

at 1.000 MHz in AM and then I switch to CW, the frequency display on the
radio changes to 1.600 MHz.
My K3 and KX2 do not do this.  Is there a setting somewhere?
I did drop my KX3 at one point recently so I am wondering if a button or
worse was pressed.
Thanks, Tom



__
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 k1...@metrocast.net 

__
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 arch...@mail-archive.com 

Re: [Elecraft] Band pass filters

[CUTTER DAVID via Elecraft]

Hi Paul

Thanks for those thoughts.  I see your point re sharing a tri-bander and that 
looks like a severe case.

Looking at the number of filters already in place and the low spurii expected 
of Elecraft gear, it looks worth considering to down-grade the extra filters.  
For instance, the KPA amplifier has low pass filters on its input and output, 
then the atu has a filtering effect.  I wouldn't know what this adds up to, but 
when the W3NQN filters were designed, things were very different.  
 
73 David G3UNA  

> On 27 July 2021 at 17:30 Paul GACEK  wrote:
> 
> 
> Hi David 
> 
> I think any answer is dependent on the station configuration. 
> 
> For example, if the M/2 station is sharing a single tribander (i.e. one on 
> 20m and another on 15m) then I imagine filters are still essential as a 
> tri-plexer will only provide so much isolation.
> 
> Another example; If a less than optimal 2xn antenna switch is used (i.e. 
> doesn’t provide excellent isolation) then filters can help to minimize 
> interference. 
> 
> These observations are based on my limited experience building a portable 
> SO2R station and separately a short time owning a Flex 6600M that had “state 
> of the art” internal filters. Reading the Flex manual seemed to suggest that 
> all bets are off when power exceeds 100w and you want to transmit on one port 
> and listen on another.
> 
> Paul
> W6PNG/M0SNA
> www.nomadic.blog
> 
> > On Jul 27, 2021, at 9:09 AM, CUTTER DAVID via Elecraft 
> >  wrote:
> > 
> > Given the improved performance of modern transceivers, is there still a 
> > call for high specification W3NQN band pass filters in a 2-transmitter 
> > station?  For example on a Multi-2 contest environment.  For instance K3S + 
> > KPA + KAT. The filter fitted between radio and amplifier. 
> > 
> > I have the *feeling* that a receive-only filter (with tx bypass) might be 
> > all that is needed.  This is much easier to implement than a full 
> > transmitter-rated set making fast switching between bands (eg for a quick 
> > look around) very quick and easy from the keyboard, etc. 
> > 
> > David G3UNA
__
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 arch...@mail-archive.com 

Re: [Elecraft] K3/K3S options and upgrades

[Ian Kahn]

Madelyn,

Thank you for the update. Does this mean, for those of us who already
ordered, we can expect our upgrade kita/components soon?

Thanks and 73,

Ian Kahn, NV4C

On Tue, Jul 27, 2021, 12:35 PM Madelyn Gomez  wrote:

> Good morning.
>
> This is a notification that the K3/K3S options and upgrades page will be
> CLOSED as of 5:00 pm PDT today, July 27th.
>
> If you have been thinking about ordering any of these items, please do so
> before 5:00 pm today.
>
> Madelyn Gomez
> Elecraft Sales
> 125 Westridge Drive, Watsonville, CA.
> 831-763-4211
> __
> 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 nv4c@gmail.com
>
__
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 arch...@mail-archive.com 

Re: [Elecraft] K3/K3S options and upgrades

[Scott Laird]

What does this mean for the KRX3A, which is still listed as
eventually-orderable on the order page?

On Tue, Jul 27, 2021 at 9:35 AM Madelyn Gomez  wrote:

> Good morning.
>
> This is a notification that the K3/K3S options and upgrades page will be
> CLOSED as of 5:00 pm PDT today, July 27th.
>
> If you have been thinking about ordering any of these items, please do so
> before 5:00 pm today.
>
> Madelyn Gomez
> Elecraft Sales
> 125 Westridge Drive, Watsonville, CA.
> 831-763-4211
> __
> 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 sc...@sigkill.org
>
__
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 arch...@mail-archive.com 

[Elecraft] K3/K3S options and upgrades

[Madelyn Gomez]

Good morning.

This is a notification that the K3/K3S options and upgrades page will be
CLOSED as of 5:00 pm PDT today, July 27th.

If you have been thinking about ordering any of these items, please do so
before 5:00 pm today.

Madelyn Gomez
Elecraft Sales
125 Westridge Drive, Watsonville, CA.
831-763-4211
__
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 arch...@mail-archive.com 

Re: [Elecraft] Band pass filters

[Paul GACEK via Elecraft]

Hi David 

I think any answer is dependent on the station configuration. 

For example, if the M/2 station is sharing a single tribander (i.e. one on 20m 
and another on 15m) then I imagine filters are still essential as a tri-plexer 
will only provide so much isolation.

Another example; If a less than optimal 2xn antenna switch is used (i.e. 
doesn’t provide excellent isolation) then filters can help to minimize 
interference. 

These observations are based on my limited experience building a portable SO2R 
station and separately a short time owning a Flex 6600M that had “state of the 
art” internal filters. Reading the Flex manual seemed to suggest that all bets 
are off when power exceeds 100w and you want to transmit on one port and listen 
on another.

Paul
W6PNG/M0SNA
www.nomadic.blog

> On Jul 27, 2021, at 9:09 AM, CUTTER DAVID via Elecraft 
>  wrote:
> 
> Given the improved performance of modern transceivers, is there still a call 
> for high specification W3NQN band pass filters in a 2-transmitter station?  
> For example on a Multi-2 contest environment.  For instance K3S + KPA + KAT. 
> The filter fitted between radio and amplifier. 
> 
> I have the *feeling* that a receive-only filter (with tx bypass) might be all 
> that is needed.  This is much easier to implement than a full 
> transmitter-rated set making fast switching between bands (eg for a quick 
> look around) very quick and easy from the keyboard, etc. 
> 
> David G3UNA
> __
> 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 paul.ga...@me.com 

__
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 arch...@mail-archive.com 

[Elecraft] New Nabble link, trying again, http://elecraft.85.s1.nabble.com/

[Keith Trinity WE6R]

__
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 arch...@mail-archive.com 

[Elecraft] Band pass filters

[CUTTER DAVID via Elecraft]

Given the improved performance of modern transceivers, is there still a call 
for high specification W3NQN band pass filters in a 2-transmitter station?  For 
example on a Multi-2 contest environment.  For instance K3S + KPA + KAT. The 
filter fitted between radio and amplifier. 

I have the *feeling* that a receive-only filter (with tx bypass) might be all 
that is needed.  This is much easier to implement than a full transmitter-rated 
set making fast switching between bands (eg for a quick look around) very quick 
and easy from the keyboard, etc. 

David G3UNA
__
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 arch...@mail-archive.com 

Re: [Elecraft] NABBLE New Link!

[Keith Trinity WE6R]

__
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 arch...@mail-archive.com 

[Elecraft] Tecsun portables

[Mike Harris via Elecraft]

Hi,

Looking to replace my dead SW portable often used for RFI tracking.

Tecsun seem to be popular. Any suggestions which model?

Regards,

Mike VP8NO
__
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 arch...@mail-archive.com 

Re: [Elecraft] Drift on 6 meters

[Graziano Roccon (IW2NOY)]

Dunno why
but is the P3 figure that is drifting, not the radio.
Stay there and you will see the figure going left and at last stabilize, 
but the signal (audio and frequency) and the radio will remain exactly 
there.
Happen only one time with a switch on from cold, after will never 
happen.


A big mistery.

Graziano iw2noy


Il 27/07/2021 16:20 Pete Smith N4ZR ha scritto:

I've just started experimenting with WSJT-X on 6M, and notice that on
the waterfall signals seem to drift slightly over the first 3-4
minutes.  It's a matter of just a few Hz, and seems to stop after that
- I'm just wondering if this is normal or reason for any concern.

--
73, Pete N4ZR
Check out the new Reverse Beacon Network
web server at .
For spots, please use your favorite
"retail" DX cluster.

__
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 grazi...@roccon.com

__
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 arch...@mail-archive.com 

Re: [Elecraft] Drift on 6 meters

[Pete Smith N4ZR]

Yeah, you guys are right - it's the K3 with updated synthesizers

73, Pete N4ZR
Check out the new Reverse Beacon Network
web server at .
For spots, please use your favorite
"retail" DX cluster.

On 7/27/2021 10:41 AM, Gordon LaPoint wrote:
Most radios drift when first turned on, and stabilize after a warmup 
time.


What radio?

Gordon - N1MGO

On 7/27/2021 10:20 AM, Pete Smith N4ZR wrote:
I've just started experimenting with WSJT-X on 6M, and notice that on 
the waterfall signals seem to drift slightly over the first 3-4 
minutes.  It's a matter of just a few Hz, and seems to stop after 
that - I'm just wondering if this is normal or reason for any concern.



__
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 pete.n...@gmail.com 

__
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 arch...@mail-archive.com 

Re: [Elecraft] Drift on 6 meters

[Gordon LaPoint]

Most radios drift when first turned on, and stabilize after a warmup time.

What radio?

Gordon - N1MGO

On 7/27/2021 10:20 AM, Pete Smith N4ZR wrote:
I've just started experimenting with WSJT-X on 6M, and notice that on 
the waterfall signals seem to drift slightly over the first 3-4 
minutes.  It's a matter of just a few Hz, and seems to stop after that 
- I'm just wondering if this is normal or reason for any concern.



__
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 arch...@mail-archive.com 

[Elecraft] Drift on 6 meters

[Pete Smith N4ZR]

I've just started experimenting with WSJT-X on 6M, and notice that on 
the waterfall signals seem to drift slightly over the first 3-4 
minutes.  It's a matter of just a few Hz, and seems to stop after that - 
I'm just wondering if this is normal or reason for any concern.


--
73, Pete N4ZR
Check out the new Reverse Beacon Network
web server at .
For spots, please use your favorite
"retail" DX cluster.

__
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 arch...@mail-archive.com 

Re: [Elecraft] Frequency shifts of KX3 when selecting CW?

[Paul Jewell]

I have this behaviour on my Yaesu Ft-897. If I set the CW modulation to 
700 kHz, then it will move to 1.700 MHz. I thought this was "normal" 
behaviour, and I was afraid to ask about it (relatively new ham). I 
haven't tried to do the same on my KX3, but I will get it out and try it.


I don't think this is due to dropping it - I think it is intentional to 
give you the correct tone for CW.


Rgds.,
Paul

On 26/07/2021 19:05, Tom wrote:

Hi
I don't recall this happening before, but if I am tuned to a signal lets say
at 1.000 MHz in AM and then I switch to CW, the frequency display on the
radio changes to 1.600 MHz.
My K3 and KX2 do not do this.  Is there a setting somewhere?
I did drop my KX3 at one point recently so I am wondering if a button or
worse was pressed.
Thanks, Tom



__
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 arch...@mail-archive.com