Re: [Elecraft] KPA3 Heatsink & PA MOSFET

[David Pratt]

In a recent message, Jeff Wandling W7BRS  wrote ...
>And I don't feel like pulling my K3 apart; what's the OEM partnumber
>of the power transistors on the KPA3 ?  I couldn't find the KPA3
>schematic on the elecraft web site.

Jeff - You'll find the schematics (including KPA3) at
http://www.elecraft.com/manual/K3_Schematics_Oct2008.pdf

73
-- 
David G4DMP
Leeds, England, UK
--


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Re: [Elecraft] K3 LINE Out mixes KRX3 and main output?

[Kok Chen]

On Jan 31, 2009, at 9:16 PM, Joe Subich, W4TV wrote:
>> For the device in question, Griffin iMic, this doesn't seem to be the
>> case. It does not separate enumerations for independently setting  
>> left
>> and right input gain. It does support stereo input, just not two
>> mic/line gain controls.
>
> I don't know about the iMic - Chen would though.

It depends on the generation of the Griffin Technology iMic.

I have three generations of iMic, dating back from more than 5 years  
ago.  The are the grey disk shaped ones, not the current-generation  
white ones.

The oldest one had a 20 bit input codec, with no digital attenuator,  
no left, no right, no Master.

The next generation is also 20 bits, but it has independent left and  
right attenuators (as seen from Core Audio -- I don't use Port Audio),  
but no master attenuator.

Both of the above have 20 bit codecs in them, but uses the USB Audio  
Interface class and you can only see 16 bits (they don't need special  
drivers, but you also don't see 20 bits, HI).

After that (and I believe it is true with the white bodied ones) they  
went to a 16 bit codec.  Mine (still a gray body) only has a master  
level control but no individual left and right controls.

If you are using Mac OS X, the easiest thing is to launch the Audio  
MIDI Setup utility that is in /Applications/Utilities.  Audio MIDI  
Setup also uses Core Audio.  There are three slider associated with  
each sound card's "volume," a Master slider, and channels 1 (left) and  
2 (right).  If a control is not available, it will be grayed out.

The microKeyer II, for example, has the Master control grayed out but  
the left and right channels are independently adjustable.  My  
digiKeyer uses the Burr-Brown PCM2902; when using Core Audio, there is  
no master, left nor right controls.

73
Chen, W7AY

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Re: [Elecraft] K3 LINE Out mixes KRX3 and main output?

[Joe Subich, W4TV]

> For the device in question, Griffin iMic, this doesn't seem to be the 
> case. It does not separate enumerations for independently setting left 
> and right input gain. It does support stereo input, just not two 
> mic/line gain controls.

I don't know about the iMic - Chen would though.  We've been using 
TI and Micronas USB sound devices that are directly supported by the 
native "Windows Audio."  The TI devices do not have an input mixer - 
sounds a lot like the iMic - but they still provide two channels of 
receive audio and an application can hook either channel or force 
the driver into mixed mono.  

I've used both the TI and Micronas based devices in stereo (separate 
left/right) for dual receive or right only (sub RX only) with MMTY, 
MMVARI, and MixW.  Unfortunately, I see the issue with FLdigi ... it 
uses mixed mono with either the TI or Micronas CODECs.  I can handle 
that by turning down the input level to the CODECS (manual gain 
controls) but that still does not permit dual receive.   Interestingly, 
DM780 handles both the TS and Micronas in left channel (Main RX) only. 

73, 

   ... Joe, W4TV 
 



> -Original Message-
> From: Leigh L. Klotz, Jr WA5ZNU [mailto:le...@wa5znu.org] 
> Sent: Saturday, January 31, 2009 7:51 PM
> To: li...@subich.com
> Cc: elecraft@mailman.qth.net
> Subject: Re: [Elecraft] K3 LINE Out mixes KRX3 and main output?
> 
> 
> Joe Subich, W4TV wrote:
> >> It doubles the data transfer to capture both sound channels
> >> and discard one. 
> >> 
> >
> > Why would you bother to capture both?  Your software should
> > be able to select left, right or mixed input from the soundcard. 
> >   
> 
> Hmmm...I'm looking at the multi-platform PortAudio v19 API here:
> http://www.portaudio.com/docs/v19-doxydocs/structPaStreamParam
eters.html

Currently, we're using PaStreamParameters::channelCount=1, which doesn't 
offer the opportunity to specify a left or right.
With channelCount=2, we could of course get two channels and discard 
one, as I mentioned.

PulseAudio, which is Linux only, doesn't seem to support it either, but 
I believe ALSA and OSS do.

So, if we use a Linux only solution it's possible to specify 
single-channel capture without discarding one channel, but for the 
cross-platform APIs, it doesn't seem possible. I know you know more 
about sound device manufacture than I do, so maybe you can point us at 
something we've overlooked in PortAudio, so at least we could get 
portable sound capture support for single-channel input.
> Even relatively basic USB sound codecs provide control over the
> input configuration. 
>   
For the device in question, Griffin iMic, this doesn't seem to be the 
case. It does not separate enumerations for independently setting left 
and right input gain. It does support stereo input, just not two 
mic/line gain controls. This seems to be the case on Linux (see 
http://seehuhn.de/pages/imic ) as well as Vista. On Vista, it's even 
worse, and won't capture in stereo at all.

Leigh/WA5ZNU


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[Elecraft] KPA3 Heatsink & PA MOSFET

[Jeff Wandling W7BRS]

Semi-off-topic --

That beautiful heatsink on top of the KPA3.. What's the mouser/digikey # 
for that bugger?  Does Elecraft sell it ala carte?

And I don't feel like pulling my K3 apart; what's the OEM partnumber 
of the power transistors on the KPA3 ?  I couldn't find the KPA3 
schematic on the elecraft web site.

Thanks,

-jeff
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Re: [Elecraft] K2 unadvertised feature ?

[Don Wilhelm]

Steve,

While something is happening, I don't think it is happening the way you 
surmise.

If the 8R line in the K2 goes low, it is because the K2 has entered the 
transmit state.

As far as I know, the presence of voltage on the VRFDET line will not 
cause the K2 to enter transmit state.  As a further thought, the driver 
for VRFDET on the K60XV is a tri-state driver and must have an enable 
input to drive the VRFDET line.

I do not doubt that something is happening in your K2 due to the RF 
input to the low power TX line, but if you do not have a transverter 
band selected on the K2, the input should be grounded by the K2 relay on 
the K60XV option.

If you *do* have the K2 set to a transverter band and the low power 
output is selected, then yes, the RF input on the output line could be 
coupled back into the K2 bandpass filter - the obvious result should be 
receiver overload, but not changing into transmit state.

If your RF field is strong enough, it could cause the K2 to do 'strange 
things', and going into transmit state could be one of those 'strange 
things', but I doubt the mechanism is through the VRFDET signal - that 
line only controls the power output, it does not place the K2 in 
transmit state by itself - there is another cause. Without measurement, 
I can only speculate about it, but I would suspect something is creating 
confusion on the AUXBUS signaling line which causes the K2 
microprocessor to enter the transmit state.

I would suggest that you work to reduce the stray RF energy in the 
shack, and if that is not possible, try ferrite cores on all inputs to 
the K2 including the power connection.  Try running the K2 and the 6 
meter transmitter from different power supplies, and/or try bonding the 
other transmitter to the K2 to see if there is any difference.  Often 
slight ground potential differences can cause "strange happenings".

73,
Don W3FPR

Steve Kavanagh wrote:
> Does the K2 have a feature where a sufficiently high V RFDET voltage causes 
> the 8R line to go low, thus switching the PIN (1N4007) diodes and protecting 
> the receiver from damage if high power is applied to the antenna socket while 
> receiving ?
>
> If so this would explain the behaviour I have been getting due to RF getting 
> into the K60XV, which I posted at
>
> http://mailman.qth.net/pipermail/elecraft/2009-January/104241.html .
>
> I've done some more measurements with everything disconnected from the K2 
> except for 12v power and an alligator clip lead used as an antenna connected 
> to the transverter out socket.  Transmitting on another rig on 6m still 
> causes the transverter key out line to be keyed, and I have confiirmed that 
> the 8R line in the K2 is going low.  It seems to take around 100 microwatts 
> to make this happen.  The only explanation that seems to make sense is that 
> this power is detected (V RFDET) and the K2 microprocessor reacts to this by 
> setting 8R low.
>
> Does this theory make sense ?
>
> 73,
> Steve VE3SMA
>
>
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>
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[Elecraft] K2 unadvertised feature ?

[Steve Kavanagh]

Does the K2 have a feature where a sufficiently high V RFDET voltage causes the 
8R line to go low, thus switching the PIN (1N4007) diodes and protecting the 
receiver from damage if high power is applied to the antenna socket while 
receiving ?

If so this would explain the behaviour I have been getting due to RF getting 
into the K60XV, which I posted at

http://mailman.qth.net/pipermail/elecraft/2009-January/104241.html .

I've done some more measurements with everything disconnected from the K2 
except for 12v power and an alligator clip lead used as an antenna connected to 
the transverter out socket.  Transmitting on another rig on 6m still causes the 
transverter key out line to be keyed, and I have confiirmed that the 8R line in 
the K2 is going low.  It seems to take around 100 microwatts to make this 
happen.  The only explanation that seems to make sense is that this power is 
detected (V RFDET) and the K2 microprocessor reacts to this by setting 8R low.

Does this theory make sense ?

73,
Steve VE3SMA


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[Elecraft] Elecraft CW Net Announcement

[Kevin Rock]

Good Evening,
   It was a sunny but cold day today.  Nice to sit by the fire and work at the 
bench in the afternoon light.  Now that I have repaired a few computers I can 
have work stations in many rooms of the house.  Since they are all networked it 
is simple to keep working in a new chair, with different light, and different 
heat conditions.  Living with wood heating means there are times when it is 
colder and other times when it is warmer.  All one needs to do is move to where 
the temperature is pleasant.  
   Twenty meters was changeable this week.  Early on it was not simple to 
communicate but on Friday all that changed.  It was great yesterday.  QRN way 
down, QSB almost non-existent, and signal strength was good.  Hopefully 
tomorrow's net will have many of these properties.  Seasonal changes are 
already noticeable.  The sun is rising earlier each day and the rate of change 
is increasing.  I thought I saw a hummingbird yesterday but it may have been a 
play of light because I never saw it again and it is about a month too early 
for them.  By the end of February the insects will start to hatch so they will 
have something to eat to tide them over until the flowers begin their 
progression of blossoming.  

Please join us tomorrow evening.
 
1) Hail signs  (first letter or two of the suffix of your call)
2) NCS help (as well as QSP/QNP  help)
 
Sunday 2300z (Sunday 3 PM PST) 14050 kHz

   Stay warm,
  Kevin.  KD5ONS

-
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Re: [Elecraft] [K2} Headphone jack dead?

[Don Wilhelm]

Tom,

The normal headphone jack failure leaves the speaker dead, but the 
headphones work OK.
It is possible that the switch in your headphone jack failed so that the 
speaker is always on whether the headphones are plugged in or not.  I 
have heard of one other case of a similar failure mode.

You can silence the speaker with a 3.5mm plug into the external speaker 
jack for immediate relief, but yes, replacing the headphone jack should 
provide a permanent fix.

73,
Don W3FPR

kg3vt...@gmail.com wrote:
> A couple times over the past year my audio died and I had to cycle 
> power to the rig to get it back. Now suddenly plugging something into 
> the headphone jack does not stop audio going to the speaker (internal 
> or external). This is handy for PSK-31, but not what I want for normal 
> operation. Is this the famous headphone jack failure? Or do I need to 
> do some troubleshooting?
>
> I did just start using the headphone jack frequently, so I am guessing 
> that is what has failed.
>
> Thanks,
>
> Tom KG3V
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Re: [Elecraft] K3 - Diversity Reception, Matched Roofing Filters

[Gary Smith]

> While the 8 pole filters have a 'nominal offset' of zero, you may find 
> that to be perfect for diversity reception that you should find the 
> absolute offset difference between the 2 filters of the same width and 
> use half the difference as the offset.  With the 8 pole filters, any 
> offset will be small - but remember that 'nominal' does not equal 
> 'exact', and as far as diversity reception is concerned, you are dealing 
> with exact if there is to be no shift between the main and sub receivers.

I also have the sub and a full compliment of 8 pole filters. The 
narrowest is the 250 and the next up is the 1K.

I am wondering how I, without all those varieties of test gear can 
determine if indeed there is a significant offset that exists with 
the 8 pole filters in my K3 and if it exists to know how much it + or 
- it is. Of course I would need to be able to test both main & sub to 
know what the particulars are so I could properly adjust the ofset 
settings.

I do find using diversity is much better for CW copy than without.

Gary
KA1J
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[Elecraft] [K2} Headphone jack dead?

[KG3VTomZ]

A couple times over the past year my audio died and I had to cycle power to  
the rig to get it back. Now suddenly plugging something into the headphone  
jack does not stop audio going to the speaker (internal or external). This  
is handy for PSK-31, but not what I want for normal operation. Is this the  
famous headphone jack failure? Or do I need to do some troubleshooting?


I did just start using the headphone jack frequently, so I am guessing that  
is what has failed.


Thanks,

Tom KG3V
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Re: [Elecraft] K3 LINE Out mixes KRX3 and main output?

[Leigh L. Klotz, Jr WA5ZNU]

Joe Subich, W4TV wrote:
>> It doubles the data transfer to capture both sound channels 
>> and discard one. 
>> 
>
> Why would you bother to capture both?  Your software should 
> be able to select left, right or mixed input from the soundcard. 
>   

Hmmm...I'm looking at the multi-platform PortAudio v19 API here:
http://www.portaudio.com/docs/v19-doxydocs/structPaStreamParameters.html

Currently, we're using PaStreamParameters::channelCount=1, which doesn't 
offer the opportunity to specify a left or right.
With channelCount=2, we could of course get two channels and discard 
one, as I mentioned.

PulseAudio, which is Linux only, doesn't seem to support it either, but 
I believe ALSA and OSS do.

So, if we use a Linux only solution it's possible to specify 
single-channel capture without discarding one channel, but for the 
cross-platform APIs, it doesn't seem possible. I know you know more 
about sound device manufacture than I do, so maybe you can point us at 
something we've overlooked in PortAudio, so at least we could get 
portable sound capture support for single-channel input.
> Even relatively basic USB sound codecs provide control over the
> input configuration. 
>   
For the device in question, Griffin iMic, this doesn't seem to be the 
case. It does not separate enumerations for independently setting left 
and right input gain. It does support stereo input, just not two 
mic/line gain controls. This seems to be the case on Linux (see 
http://seehuhn.de/pages/imic ) as well as Vista. On Vista, it's even 
worse, and won't capture in stereo at all.

Leigh/WA5ZNU


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Re: [Elecraft] Impossible mission? USB with the 13khz filter for PSK31on Digipan

[Joe Subich, W4TV]

I don't even see it as an issue ... even with those receivers 
that produce audio to 6 KHz (for DigiPan 2.0), the transmitter 
will be limited to 2.8 or 3 KHz audio input anyway due to the 
bandwidth of the transmit IF filter.  Without checking, I believe 
the K3's transmit audio (DATA A mode) is 200 - 2800 Hz just like 
any other properly designed transceiver.

73, 

   ... Joe, W4TV 
 


> -Original Message-
> From: Thomas Tumino [mailto:thomastum...@yahoo.com] 
> Sent: Saturday, January 31, 2009 10:26 AM
> To: elecraft@mailman.qth.net; li...@subich.com
> Subject: RE: [Elecraft] Impossible mission? USB with the 
> 13khz filter for PSK31on Digipan
> 
> 
> Thanks Joe for setting me straight on that.  It has been 
> years since I had read about it.
> 
> So I guess this is only a PSK31 issue (or any software with 
> panoramic receive) with an external computer, and minimal at 
> that...still it would be nice...
> 
> 73,
> Tom
> 
> 
> --- On Fri, 1/30/09, Joe Subich, W4TV  wrote:
> 
> From: Joe Subich, W4TV 
> Subject: RE: [Elecraft] Impossible mission? USB with the 
> 13khz filter for PSK31on Digipan
> To: thomastum...@yahoo.com, elecraft@mailman.qth.net
> Date: Friday, January 30, 2009, 9:10 PM
> 
> 
> > I can only speak for Yaesu and Icom gear, but Yaesu
> > rigs specify 5Khz transmit FM in their manuals and in
> > the Icom 706MKIIG service manual states FM deviation
> > is adjusted for 4.5Khz.
> 
> There is a BIG difference between FM deviation and 
> maximum modulating frequency (audio response).  I was 
> speaking specifically to maximum modulating frequency. 
> 
> As Lyle has said elsewhere, the maximum modulating 
> frequency in the K3 is limited to about 2.8 KHz - in 
> all modes except ESSB - which results in an occupied 
> bandwidth of about 15.5 KHz with 5 KHz of deviation 
> for FM.  
> 
> 
> 
> 
> 
> > -Original Message-
> > From: Thomas Tumino [mailto:thomastum...@yahoo.com]
> > Sent: Friday, January 30, 2009 1:33 PM
> > To: li...@subich.com
> > Subject: RE: [Elecraft] Impossible mission? USB with the 
> > 13khz filter for PSK31on Digipan
> > 
> > 
> > 
> > 
> > No, typical transmitted bandwidth for communications use -
> > including FM is about 100 Hz to 3000 Hz.  
> > 
> > I can only speak for Yaesu and Icom gear, but Yaesu
> > rigs specify 5Khz transmit FM in their manuals and in
> > the Icom 706MKIIG service manual states FM deviation
> > is adjusted for 4.5Khz.  I would assume
> > this was the standard for all Yaesu and Icom gear
> > at least.  Some Yaesu rigs do have a special 
> > "FM-N" transmit mode of 2.5 Khz, similar to FRS radios,
> > but I think that mode is the exception and not 
> > the rule. 
> > I think the DSP receive limit of 4Khz should at least
> > be mentioned in the K3 materials (or perhaps it 
> > is and I missed it?).  This bothers me as
> > really I feel FM and AM are most regularly used 
> > to enjoy audio of a better quality then SSB audio, 
> > and a 4Khz limit cuts down on that a bit.
> > 73 to all and thanks for your
> >  help,
> > Tom-N2YTF
> >  
> > 
> 

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Re: [Elecraft] Impossible mission? USB with the 13khz filter for PSK31on Digipan

[Joe Subich, W4TV]

> Most PC SDR software needs an I/Q pair of signals which this 
> is not, but there is software that will take a single signal 
> elevated above baseband (I believe Softrock works this way).

The SoftRock receivers and LP-Pan operate much the same way.  
They are fixed frequency downconverters that provide I/Q audio 
outputs.  The I/Q audio is then applied to a common soundcard.  
The higher quality soundcards provide a wider frequency "window"
(higher sample rates), lower noise floor/higher dynamic range, 
and better image rejection (better I/Q balance). 

73, 

   ... Joe, W4TV 
 
 


> -Original Message-
> From: elecraft-boun...@mailman.qth.net 
> [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of ab2tc
> Sent: Saturday, January 31, 2009 11:49 AM
> To: elecraft@mailman.qth.net
> Subject: Re: [Elecraft] Impossible mission? USB with the 
> 13khz filter for PSK31on Digipan
> 
> 
> 
> The 2nd IF is 15kHz which is well within the capabilities of 
> many sound cards. But it would require surgery to the K3 as 
> this signal is not available externally. It would certainly 
> be an interesting experiment for the bold risk taker. Most PC 
> SDR software needs an I/Q pair of signals which this is not, 
> but there is software that will take a single signal elevated 
> above baseband (I believe Softrock works this way).
> 
> 
> Don Wilhelm-4 wrote:
> > 
> > I don't think there are any soundcards capable of handling 
> the 8+ MHz 
> > IF
> > output from the K3, but LP-PAN converts that IF signal down 
> to baseband 
> > and does exactly what you are asking about with PowerSDR.
> > 
> > 73,
> > Don W3FPR
> > 
> > AD6XY wrote:
> >> Has anyone tried taking the K3s 2nd IF out to a high end soundcard 
> >> and doing the DSP on a PC?
> > 
> > 
> 
> 
> -
> AB2TC - Knut
> -- 
> View this message in context: 
> http://n2.nabble.com/Impossible-mission--USB-with-the-13khz-fi
lter-for-PSK31-on-Digipan-tp2240355p2250439.html
Sent from the Elecraft mailing list archive at Nabble.com.

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[Elecraft] K3 and Codan antenna

[Ron - PE8E]

Just a long shot, but I'm going to ask anyway.

Is anyone out there using his (or her's) K3 with a Codan 9350 mobile
antenna? Maybe one of the mates "down under"?
I have some questions about interfacing a K3 with the antenna's builtin
tuner.

73 de PE8E, Ron.

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Re: [Elecraft] K3 - Diversity Reception, Matched Roofing Filters

[Don Wilhelm]

Walter,

Whatever the absolute offset required for the 8 pole filters, it should 
not deter your building.  The offsets are entered into the menu after 
the build is complete.

While the 8 pole filters have a 'nominal offset' of zero, you may find 
that to be perfect for diversity reception that you should find the 
absolute offset difference between the 2 filters of the same width and 
use half the difference as the offset.  With the 8 pole filters, any 
offset will be small - but remember that 'nominal' does not equal 
'exact', and as far as diversity reception is concerned, you are dealing 
with exact if there is to be no shift between the main and sub receivers.

I am not going to go into saying how to determine the exact offset 
required, I have not done that because I don't have the sub RX and have 
only the 5 pole filters - that meets my needs.  I leave that exercise to 
others.

73,
Don W3FPR

Walter V. Gilles wrote:
> I am finishing up my K3/100 kit (all 8 pole roofing filters, no sub 
> rcvr), and already looking over the fence.
>  
> Am I correct in my understanding that for diversity reception with the 
> KRX3, and using all 8 pole roofing filters (same 8 pole BW in same 
> slots for main and sub boards), that matching of filters is 
> unnecessary due to the inherent 8 pole filter zero offset?  
> Conversely, matching of filters for diversity only applies if one uses 
> offset 5 pole filters?  Thanks.
>  
> Walter, N0DZJ
>
>
> 
>
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Re: [Elecraft] K3 - Diversity Reception, Matched Roofing Filters

[W0MU Mike Fatchett]

>From the Elecraft ordering page:

For same operating frequency diversity receive use with K3 and KRX3. Set the
K3 offset menu for both filters equal and to the nearest 10Hz offset
approximately half way between their marked offset frequencies. Only applies
to our 5 pole filters, 200 Hz, 500 Hz and 2.7 kHz, which have non-zero
offsets. 

Note: Best if both filters to be matched are ordered at the same time. We
will try to accommodate matching to 5 pole filters already shipped (8 pole
filters all have a nominal 0 offset) but we can only guarantee an offset
match within 40 Hz if both filters are ordered at the same time, due to
batch to batch manufacturing frequency changes. The menu offset for both
filters that are within 40 Hz of each other can be set equally to the
midpoint between their offsets.  

-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Walter V. Gilles
Sent: Saturday, January 31, 2009 12:51 PM
To: elecraft@mailman.qth.net
Subject: [Elecraft] K3 - Diversity Reception, Matched Roofing Filters

I am finishing up my K3/100 kit (all 8 pole roofing filters, no sub rcvr),
and already looking over the fence.
 
Am I correct in my understanding that for diversity reception with the KRX3,
and using all 8 pole roofing filters (same 8 pole BW in same slots for main
and sub boards), that matching of filters is unnecessary due to the inherent
8 pole filter zero offset?  Conversely, matching of filters for diversity
only applies if one uses offset 5 pole filters?  Thanks.
 
Walter, N0DZJ


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[Elecraft] Fw: [K1] SN 2682 is borne

[Steve M0ECS (subs)]

 Hallo Ingo !

 Sehr gut gemacht! Hier habe ich Serialnummer 2294 aber kein K2. Ich wünsche 
Ihnen viel Glück, viel Erfolg und immer noch viel Spaß mit ihrem neuen K1.

 herzliche Grüße

 Steve - M0ECS

 

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Re: [Elecraft] K3 BUFFER MOD?

[Bill W4ZV]

Bill Maddock-2 wrote:
> 
> 
>   Later today I will start building my LP-PAN kit - I was wondering
> if the K3 Buffer mod that is recommended will void the warranty
> on my radio? 
> 

Probably not.  Wayne is well aware of it and has never said the warranty
would be voided.


Bill Maddock-2 wrote:
> 
> Is it really worth the effort? Where is best place to
> attain parts? 
> 

Unless you want to identify extremely weak signals, perhaps not.  On 160m
nearly all DX signals are weak and many were not detectable without the mod. 
I robbed junk SMD boards for the two resistors (R8/R9) but most major
suppliers carry SMD parts (e.g. Mouser, Newark, etc.)


Bill Maddock-2 wrote:
> 
> I have the K3 Audio line out mod kit to do figured
> I should probably do it all at the same time?
> 

It really doesn't matter.  The mod can be done by removing only the front
bottom cover, which is extremely easy to access anytime.

73,  Bill

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Re: [Elecraft] K3 - Diversity Reception, Matched Roofing Filters

[Bill W4ZV]

Walter V. Gilles wrote:
> 
> Am I correct in my understanding that for diversity reception with the
> KRX3, and using all 8 pole roofing filters (same 8 pole BW in same slots
> for main and sub boards), that matching of filters is unnecessary due to
> the inherent 8 pole filter zero offset?  Conversely, matching of filters
> for diversity only applies if one uses offset 5 pole filters?  Thanks.
>  
> Walter, N0DZJ
> 

Theoretically true, but 8-pole filters do not necessarily have zero offset. 
Several folks have measured actual offsets of up to 80 Hz, which could be
significant for a narrow CW filter (e.g. 80 out of the "250" 8-pole's actual
BW of 370 is >20%).

73, Bill



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Re: [Elecraft] [K2] K2 battery source in UK

[Stephen Prior]

Hello Guy

Yes, I had the same issue and that's what killed the battery for me.  By the
time I had realised and had increased my psu output voltage to 14.5V,
unfortunately the damage had been done.  Don W3FPR has some info on his
website and has provided a separate charging input socket for his K2 and I
might do just that.

Thanks for the reply

73 Stephen


On 31/01/2009 19:48, "Guy Olinger, K2AV"  wrote:

> 
> One thing I have found is that 13.8 to the rear connector does not provide
> 13.8 to the battery, and it would NOT charge fully.  Some of that is diode
> drop and some is drop in the connectors.  I now run that power supply at
> 14.4 for the K2, K3 and everything else. That puts about 13.9/14.0 on the
> battery and that does apparently charge it fully.
> 
> 73, Guy
> 



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Re: [Elecraft] K3 LINE Out mixes KRX3 and main output?

[Joe Subich, W4TV]

> It doubles the data transfer to capture both sound channels 
> and discard one. 

Why would you bother to capture both?  Your software should 
be able to select left, right or mixed input from the soundcard. 
Even relatively basic USB sound codecs provide control over the
input configuration. 

73, 

   ... Joe, W4TV 
 


> -Original Message-
> From: elecraft-boun...@mailman.qth.net 
> [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Leigh 
> L. Klotz, Jr WA5ZNU
> Sent: Saturday, January 31, 2009 1:24 AM
> To: a...@cablespeed.com
> Cc: Elecraft Reflector
> Subject: Re: [Elecraft] K3 LINE Out mixes KRX3 and main output?
> 
> 
> Yes, so my request would be to be able to mute one of them. 
> Using a cable to connect only left is the best solution if 
> the rig can't 
> mute one.
> It doubles the data transfer to capture both sound channels 
> and discard one. I agree though it's not that high priority. 
> Leigh/WA5ZNU
> > When the SUB is turned on the Line Out audio is Main=left and 
> > Sub=Right.
> >
> > -
> > 73,
> > Greg - AB7R
> > Whidbey Island WA
> > NA-065
> >
> >
> > On Fri Jan 30 11:12 , Iain MacDonnell - N6ML  sent:
> >
> >   
> >> Leigh L. Klotz, Jr WA5ZNU wrote:
> >> 
> >>> Is it possible to control whether the sub rx goes to the 
> line out or 
> >>> not? It seems that both main and sub rx are always going to line 
> >>> out; I guess they're on left/right channels? If not, I 
> guess I need 
> >>> to make a cable to cut out one channel so I don't see 
> both with my 
> >>> mono sound card line input.
> >>>   
> >> That doesn't quite make sense. If your line-in is really mono, the 
> >> right channel would not be connected to anything. Are you 
> sure it's 
> >> not the software you're using that's mixing the two 
> channels together 
> >> ?
> >>
> >> Also check your audio recording volume control settings (assuming 
> >> this is on Windoze) - maybe you're recording the "Mono 
> Mix" instead 
> >> of "Line In" ?
> >>
> >> ~Iain
> >> ___
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> >> 
> >
> >
> >   
> 
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Re: [Elecraft] K3 Sub Rx idea

[Bill W4ZV]

David Ferrington, M0XDF wrote:
> 
> Could that have meant redundant when the KRX3 is installed?
> 

Possibly, but I have a KRX3 and leave my K3 in diversity continuously.  REV
still works great in split pileups with diversity on (to better copy weak DX
signals).


David Ferrington, M0XDF wrote:
> 
> I kinda wonder, there is the A/B button, what does REV give you that A/ 
> B doesn't?
> 

The difference is that REV is momentary (as long as you hold the button) and
returns when you release it.  A/B must be toggled each time to swap TX<>RX
which guarantees you will eventually transmit on the DX station's frequency
when you forget to toggle.

REV can also ensure you don't accidentally bump VFO A off of the DX station. 
Tune in the DX station with VFO A, LOCK, and then use REV to set the TX on
VFO B (using the BIG knob).  You can move your TX frequency as long as REV
is depressed and VFO A stays locked on the DX station.

This is not something new.  Kenwood's TS-930S had it in the early 80s as
"TF-SET" and I believe Icom calls it "XFC" (Transmit Frequency Check).  It's
still very useful even with a KRX3 if you like to leave diversity engaged as
I do.

73,  Bill

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[Elecraft] K3 - Diversity Reception, Matched Roofing Filters

[Walter V. Gilles]

I am finishing up my K3/100 kit (all 8 pole roofing filters, no sub rcvr), and 
already looking over the fence.
 
Am I correct in my understanding that for diversity reception with the KRX3, 
and using all 8 pole roofing filters (same 8 pole BW in same slots for main and 
sub boards), that matching of filters is unnecessary due to the inherent 8 pole 
filter zero offset?  Conversely, matching of filters for diversity only applies 
if one uses offset 5 pole filters?  Thanks.
 
Walter, N0DZJ


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Re: [Elecraft] [K2] K2 battery source in UK

[Guy Olinger, K2AV]

One thing I have found is that 13.8 to the rear connector does not provide 
13.8 to the battery, and it would NOT charge fully.  Some of that is diode 
drop and some is drop in the connectors.  I now run that power supply at 
14.4 for the K2, K3 and everything else. That puts about 13.9/14.0 on the 
battery and that does apparently charge it fully.

73, Guy

- Original Message - 
From: "Dave G4AON" 
To: 
Sent: Saturday, January 31, 2009 2:19 PM
Subject: Re: [Elecraft] [K2] K2 battery source in UK


>I agree Stephen! I only bought the KBT2-X (that's the kit w/o the
> battery) and used a 2.3 AH battery as that was the largest capacity I
> could find in the UK that would fit (Yuasa from memory, although I am
> now on my 2nd battery and can't recall the typle).
>
> What ruins these batteries is being completely discharged, keeping them
> fully charged shouldn't be a problem. Just don't expect too much from
> the battery and replace it from time to time.
>
> 73 Dave, G4AON
> --
> To buy a replacement from Elecraft and then pay for the 1kg battery to be
> shipped from CA to the UK is crazy. I'd be grateful for any pointers from
> UK readers!
>
> Thanks and 73
>
> Stephen G4SJP
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Re: [Elecraft] [K2] K2 battery source in UK

[Dave G4AON]

Stephen, I can find two other sources of 2.3 AH, see below.

RS Components (http://rswww.com/), part number 537-5450

http://shop.eurobatteries.com/batteries-sealed-lead-acid-c-25_62.html

73 Dave, G4AON
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Re: [Elecraft] K3 BUFFER MOD?

[Richard Ferch]

Bill,

I am sure you will get more expert advice than I can give you on this, but
so far I have not found the buffer mod necessary with my LP-PAN - right now
I have only a vertical antenna and have only tried the LP-PAN out on low
bands, where band noise alone is clearly visible on the display even without
the mod. You may feel differently if you are using directional antennas on
quiet bands, but my suggestion would be to start out without the buffer mod
and see how well your LP-PAN works without it.

Although I have installed the Audio line out mod myself, I think it probably
won't make any difference to LP-PAN operation, since the LP-PAN does not use
line out. However, I found that the mod to bypass RF chokes in the ground
return lines made a big difference:
(, or go
to  and scroll down to the link
"Improving the Immunity of the Rear-Panel RS232 and Audio Connectors to
RF"). Before making this change, I was seeing a lot of polling noise from
the radio control serial port on the PowerSDR display. Bypassing the choke
in the RS232 ground return seems to have helped a lot in my case - YMMV, of
course.

73,
Rich VE3KI
K3 #1595


N4ZI wrote:
> Guys,
> 
>   Later today I will start building my LP-PAN kit - I was wondering
> if the K3 Buffer mod that is recommended will void the warranty
> on my radio? Is it really worth the effort? Where is best place to
> attain parts? I have the K3 Audio line out mod kit to do figured
> I should probably do it all at the same time? My S/N is 1059
> 
> Thanks and 73,
> 
> Bill N4ZI

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Re: [Elecraft] [K2] K2 battery source in UK

[Stephen Prior]

Hi Dave

There are some Yuasa batteries on eBay at the moment specified as deep
cycle, but I agree that most of these batteries are only designed for
standby use and in most applications will only ever sit on float charge
throughout their working life.

I was just hoping for one with greater capacity than the current offerings!

73 Stephen G4SJP



On 31/01/2009 19:19, "Dave G4AON"  wrote:

> 
> I agree Stephen! I only bought the KBT2-X (that's the kit w/o the
> battery) and used a 2.3 AH battery as that was the largest capacity I
> could find in the UK that would fit (Yuasa from memory, although I am
> now on my 2nd battery and can't recall the typle).
> 
> What ruins these batteries is being completely discharged, keeping them
> fully charged shouldn't be a problem. Just don't expect too much from
> the battery and replace it from time to time.
> 
> 73 Dave, G4AON
> --
> To buy a replacement from Elecraft and then pay for the 1kg battery to be
> shipped from CA to the UK is crazy. I'd be grateful for any pointers from
> UK readers!
> 
> Thanks and 73
> 
> Stephen G4SJP
> 



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Re: [Elecraft] K3 BUFFER MOD?

[Doug Joyce]

Bill:  I can't comment on the warranty part, but as to the rest -

I just finished my K3 (S/N 2432) and have the LP-Pan up and running with a
Dell D830 notebook and the E-MU 0202 sound card.  While it has only been in
use about a week and I've not completed all the calibration yet, use of the
K3 preamp (as Larry has suggested) seems to provide a noise floor of better
than -110 and I can see just about everything I can hear.  If you decide to
do the mod, the parts are available from Digi-Key.  The 49.9 ohm is P/N
RR12Q49.9DCT-ND and the 15.5K P/N is RR12P15.0KDCT-ND.  These are 1/10W .5%
0805 SMD and less than $4.00 for a qty of 50.

Based on the performance to date and the fact that I'm new to SMD I've not
felt the need to do the mod on my K3 yet, although I did get the parts a
week or so ago.

Hope that helps

73

Doug,  VE3MV


- Original Message - 
From: "Bill Maddock" 
To: 
Sent: Saturday, January 31, 2009 12:58 PM
Subject: [Elecraft] K3 BUFFER MOD?


> Guys,
>
>   Later today I will start building my LP-PAN kit - I was wondering
> if the K3 Buffer mod that is recommended will void the warranty
> on my radio? Is it really worth the effort? Where is best place to
> attain parts? I have the K3 Audio line out mod kit to do figured
> I should probably do it all at the same time? My S/N is 1059
>
> Thanks and 73,
>
> Bill N4ZI
>
>
>
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>


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[Elecraft] K3

[Gerd OE3GSA]

K3 built in 2 days - on the air after half a year in the box . 
Impressive radio with marvelous QSK   :-)

73 de Gerd OE3GSA

K1 #270, K3 #1676
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Re: [Elecraft] K3 Sub Rx idea

[David Ferrington, M0XDF]

Could that have meant redundant when the KRX3 is installed?
I kinda wonder, there is the A/B button, what does REV give you that A/ 
B doesn't?
-- 
Experience is that marvellous thing that enables you to recognize a  
mistake when you make it again. -Franklin P. Jones

On 31 Jan 2009, at 18:52, Bill W4ZV wrote:
> ab2tc wrote:
>>
>> Another redundant button to me is the REV button.
> You must never work DX in split pileups...else you aren't locating  
> your RX
> where the DX is listening.  If you depend on A/B to do this, you'll
> inevitably transmit on top of the DX station.

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Re: [Elecraft] [K2] K2 battery source in UK

[Dave G4AON]

I agree Stephen! I only bought the KBT2-X (that's the kit w/o the
battery) and used a 2.3 AH battery as that was the largest capacity I
could find in the UK that would fit (Yuasa from memory, although I am
now on my 2nd battery and can't recall the typle).

What ruins these batteries is being completely discharged, keeping them
fully charged shouldn't be a problem. Just don't expect too much from
the battery and replace it from time to time.

73 Dave, G4AON
--
To buy a replacement from Elecraft and then pay for the 1kg battery to be
shipped from CA to the UK is crazy. I'd be grateful for any pointers from
UK readers!

Thanks and 73

Stephen G4SJP
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Re: [Elecraft] How2 K2 as RX with TS-450 as TX ?

[Dave G4AON]

Sam, I've done this with a K3 (TX) and K2 (RX) combination. It's fairly
easy, well that is except for obtaining an RX output from the TS-450S. I
have never seen one of these Kenwood radios, this is how I operated my
K2 as an external 2nd RX from my K3:

A) The K3 and many other transceivers have an external receiver loop,
with the K3 this needs the KXV3 transverter interface.

B) If you also want to receive on the 450, you will need to make a
ferrite splitter. This will result in a 3 dB loss of signal but can be
switched out of circuit to give RX only on the main transceiver
depending on the transceiver (K3 has an RX ANT button that does this).
The wiring details for a splitter are about halfway down the K3 page at:
http://www.astromag.co.uk/k3/

C) To mute the K2 from the other transceiver, key it on transmit using
the linear keying line of the main radio (set key input to "hand", it
will key/mute the radio on SSB as well as CW). My K2 has the external RX
antenna socket courtesy of the K160RX option, so I can connect to it's
RX only BNC socket and put a dummy load on the main socket. Set the K2
to zero power, zero level side tone on CW, set the TX/RX delay perhaps a
bit longer than you normally would for QSK.

D) If you also want to use a linear, make a diode splitter box. It needs
2 x 1N4001 diodes, cathodes of both connect together and to the main
radio linear output line, one anode to the linear, the other anode to
the K2 key in socket... This isolates the linear and K2 keying lines.

E) To have both radios tune together from the main radio, link them with
Ham Radio Deluxe (Synch feature). Again I don't know if the TS450 has a
serial socket, but the K3 - K2 combination work together like this, you
can have the K3 drive the K2 tuning, with the K2 being independently
tunable until you move the K3 tuning knob (or vice versa depending on
which way you synch them in HRD).

You can also work this the other way around, I have used my K2 as the
transmitter for a K2 and Drake R4A combination, see:
http://www.astromag.co.uk/pdfs/K2externalRX.pdf

Almost every day I run my Perseus receiver off the ferrite splitter on
the back of my K3, linking both with HRD as described above. Being able
to "click and go" on signals seen on the Perseus makes for very easy CW
operating when the bands are fairly quiet... Much better than endlessly
tuning around.

Hope that wasn't too much detail!

73 Dave, G4AON


Using the same antenna,
I want to use my K2 as the receiver
while using my TS-450S as the transmitter.

I know I will need to switch the antenna from one rig to the other,
and somehow protect and mute the K2 during transmit.
How can I accomplish this?
What circuit could I build?
Where would I find a muting capability in the K2?

TIA
-- 
GB & 73
KA5OAI
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[Elecraft] [K2} K2 battery source in UK

[Stephen Prior]

The battery which came with the battery kit from Elecraft about 12 months or
so ago is refusing to take any charge- I think I left it too long sitting at
a nominal 13.8V and it never properly charged after having been discharged.
I shan't repeat the mistake and will modify the K2 to take a separate
charging input, however now I cannot find a replacement battery in the UK.

The original is 2.9Ah, but in the same size case all that is available now
from the usual suppliers is a 2.1Ah battery which represents significantly
less capacity.  This information is coming from suppliers which do stock the
same make as Elecraft supplied originally.  I find it odd that it should
have been replaced by a battery of lower capacity unless that is the
original spec was over-generous or the battery was unreliable.

To buy a replacement from Elecraft and then pay for the 1kg battery to be
shipped from CA to the UK is crazy.  I'd be grateful for any pointers from
UK readers!

Thanks and 73

Stephen G4SJP



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Re: [Elecraft] K3 Sub Rx idea

[Bill W4ZV]

ab2tc wrote:
> 
> Another redundant button to me is the REV button.
> 

You must never work DX in split pileups...else you aren't locating your RX
where the DX is listening.  If you depend on A/B to do this, you'll
inevitably transmit on top of the DX station.

73,  Bill

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[Elecraft] How2 K2 as RX with TS-450 as TX ?

[Sam Morgan]

Using the same antenna,
I want to use my K2 as the receiver
while using my TS-450S as the transmitter.

I know I will need to switch the antenna from one rig to the other,
and somehow protect and mute the K2 during transmit.
How can I accomplish this?
What circuit could I build?
Where would I find a muting capability in the K2?

TIA
-- 
GB & 73
KA5OAI
Sam Morgan
Linux, the lifetime learning experience.
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[Elecraft] K3 BUFFER MOD?

[Bill Maddock]

Guys,

  Later today I will start building my LP-PAN kit - I was wondering
if the K3 Buffer mod that is recommended will void the warranty
on my radio? Is it really worth the effort? Where is best place to
attain parts? I have the K3 Audio line out mod kit to do figured
I should probably do it all at the same time? My S/N is 1059

Thanks and 73,

Bill N4ZI


  
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[Elecraft] Elecraft SSB Net Announcement

[Phil and Christina]

Hi gang,

The weekly Elecraft SSB net will meet tomorrow (Sunday, 2/1/09) at 1800Z.
We will start at 14.316 MHz, and QSY if needed.  The net control is in
western Oregon, but we will need a good east coast or midwest station to
relay a few west coast signals that may be too close to net control.  See
you there.

73,

Phil, NS7P

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Re: [Elecraft] K2 - Extra part - diode?

[djmd]

Ha... yep, RF Probe. Thanks Donald.



djmd wrote:
> 
> Hello all -
> 
> Just got done with all the components on the K2 and I have a couple extra
> parts I just wanted to make sure about... one seems to be some kind of a
> glass diode - see pic:
> 
> http://images46.fotki.com/v1452/photos/7/769119/5123053/part-vi.jpg
> 
> The other part is a 4.7M resistor that was not on the tape.
> 
> I don't see either of these in the parts list... but I could be passing
> them over.
> 
> Thanks!
> 
> 

-- 
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Re: [Elecraft] K3 - diversity reception question

[wayne burdick]

This is about an 8 dB drop. The first 3 dB can be attributed to the 
fact that main and sub are now sharing the main antenna path (the 
splitter gets turned on). The other 5 dB must be due to some 
combination of the other factors I listed:

> 1. band-pass filter alignment and losses
> 2. 1st mixer loss
> 3. crystal filter loss
> 4. crystal filter ripple
> 5. physical alignment of the SUB AF control (when used as main/sub 
> BALANCE)

Are the crystal filters in the two receivers matched? If not, you could 
be using a filter with a lot of loss in the sub vs. the main at a 
particular bandwidth.

I'll be out of town for a few days, so you might want to check with 
Gary about how to isolate which of the above is causing the loss. You 
can try different bands and filters, for example.

Wayne
N6KR

On Jan 31, 2009, at 3:06 AM, Dr. Werner Furlan wrote:

> I think I need some help with this.
> I have connected a noise gernerator to my ANT1 and I see AFV floating
> between 622 and 702 with SUB engaged,  and 1578 and 1719 without SUB.
> (this was on 3.670 kHz)
>
> 73! de Werner OE9FWV
>
>
>
>
> -- 
>  Foreploy: Any misrepresentation about yourself for the purpose of
>  obtaining sex.
>
>
> Email powered by Pegasus Mail free at 
> Homepage: 
> Fone +43 5522 75013
> Fax +43 5522 75013 15
> Mobile +43 664 6340014
> Elecraft K2 #5203 K3 #656
>
>
>
>

---

http://www.elecraft.com

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[Elecraft] K2 - Extra part - diode?

[djmd]

Hello all -

Just got done with all the components on the K2 and I have a couple extra
parts I just wanted to make sure about... one seems to be some kind of a
glass diode - see pic:

http://images46.fotki.com/v1452/photos/7/769119/5123053/part-vi.jpg

The other part is a 4.7M resistor that was not on the tape.

I don't see either of these in the parts list... but I could be passing them
over.

Thanks!

-- 
View this message in context: 
http://n2.nabble.com/K2---Extra-part---diode--tp2250604p2250604.html
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Re: [Elecraft] SHIFT pitch

[wayne burdick]

On Jan 31, 2009, at 4:05 AM, GM0ELP wrote:

>
> I note that I can use NORM during TX but not NORM I/II, is this in the 
> fix
> list?

Yes.
Wayne
N6KR

---

http://www.elecraft.com

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Re: [Elecraft] K3 Sub Rx idea

[Milt, N5IA]

GM Wayne,

I understand A/B and the swap per AB2TC's comment.  But there are some of 
the settings which do not follow.  I know you know and will address them if 
at all possible.  It was just my dos centavos thrown into the pile.

73, and thanks de Milt, N5IA

- Original Message - 
From: "wayne burdick" 
To: "Milt, N5IA" 
Cc: ; "Elecraft Reflector" 
Sent: Saturday, January 31, 2009 9:55 AM
Subject: Re: [Elecraft] K3 Sub Rx idea


> I'm gradually weeding out commands that don't work in BSET mode. Until
> then, you might want to do A/B, change the setup, then A/B again.
>
> 73,
> Wayne
> N6KR
>
>
> On Jan 31, 2009, at 6:40 AM, Milt, N5IA wrote:
>
>> Wayne,
>>
>> The most undesireable aspect of BSET is the fact that the
>> communication with the computer is interrupted.  The logging program
>> dispays a pop-up window indicating lost communication if BSET is in
>> use for more than a few seconds. At least that is my experience while
>> using N1MM.
>>
>> Milt, N5IA
>>
>> - Original Message - From: "wayne burdick" 
>>
>>> The BSET switch *is* intended as a context swap that allows the front
>>> panel to control the sub receiver. It already allows control of many
>>
>>> 73,
>>> Wayne
>>> N6KR
>>
>>
>>
>
> ---
>
> http://www.elecraft.com
>






No virus found in this incoming message.
Checked by AVG - http://www.avg.com
Version: 8.0.176 / Virus Database: 270.10.16/1926 - Release Date: 1/30/2009 
5:31 PM

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Re: [Elecraft] K3 Sub Rx idea

[wayne burdick]

I'm gradually weeding out commands that don't work in BSET mode. Until 
then, you might want to do A/B, change the setup, then A/B again.

73,
Wayne
N6KR


On Jan 31, 2009, at 6:40 AM, Milt, N5IA wrote:

> Wayne,
>
> The most undesireable aspect of BSET is the fact that the 
> communication with the computer is interrupted.  The logging program 
> dispays a pop-up window indicating lost communication if BSET is in 
> use for more than a few seconds. At least that is my experience while 
> using N1MM.
>
> Milt, N5IA
>
> - Original Message - From: "wayne burdick" 
>
>> The BSET switch *is* intended as a context swap that allows the front
>> panel to control the sub receiver. It already allows control of many
>
>> 73,
>> Wayne
>> N6KR
>
>
>

---

http://www.elecraft.com

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Re: [Elecraft] Impossible mission? USB with the 13khz filter for PSK31on Digipan

[ab2tc]

The 2nd IF is 15kHz which is well within the capabilities of many sound
cards. But it would require surgery to the K3 as this signal is not
available externally. It would certainly be an interesting experiment for
the bold risk taker. Most PC SDR software needs an I/Q pair of signals which
this is not, but there is software that will take a single signal elevated
above baseband (I believe Softrock works this way).


Don Wilhelm-4 wrote:
> 
> I don't think there are any soundcards capable of handling the 8+ MHz IF 
> output from the K3, but LP-PAN converts that IF signal down to baseband 
> and does exactly what you are asking about with PowerSDR.
> 
> 73,
> Don W3FPR
> 
> AD6XY wrote:
>> Has anyone tried taking the K3s 2nd IF out to a high end soundcard and
>> doing
>> the DSP on a PC?
> 
> 


-
AB2TC - Knut
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Re: [Elecraft] K3 Sub Rx idea

[ab2tc]

Hi all,

Isn't it much easier to use A/B, do your stuff and then swap back again? I
don't have the subreceiver, but I use the B VFO a lot and always use the
swap, do, swap method for everything. B SET is another button I simply never
use. Another redundant button to me is the REV button.


Milt Jensen, N5IA wrote:
> 
> Wayne,
> 
> The most undesireable aspect of BSET is the fact that the communication
> with 
> the computer is interrupted.  The logging program dispays a pop-up window 
> indicating lost communication if BSET is in use for more than a few
> seconds. 
> At least that is my experience while using N1MM.
> 
> Milt, N5IA
> ml
> 
> 


-
AB2TC - Knut
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[Elecraft] Reminder - UK Elecraft net Sundays 1000 local, 3630 KHz

[Dave G4AON]

The frequency is plus or minus the QRM. Note the
start time of 1000 hours to try and minimise
European QRM.

73 Dave, G4AON
K3/100, Acom 1000, dipole






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Re: [Elecraft] Impossible mission? USB with the 13khz filter for PSK31on Digipan

[Don Wilhelm]

I don't think there are any soundcards capable of handling the 8+ MHz IF 
output from the K3, but LP-PAN converts that IF signal down to baseband 
and does exactly what you are asking about with PowerSDR.

73,
Don W3FPR

AD6XY wrote:
> Has anyone tried taking the K3s 2nd IF out to a high end soundcard and doing
> the DSP on a PC?
>   
> 
>
>
> No virus found in this incoming message.
> Checked by AVG - www.avg.com 
> Version: 8.0.233 / Virus Database: 270.10.16/1926 - Release Date: 01/30/09 
> 17:31:00
>
>   
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Re: [Elecraft] K3 KRX3 B SET and FREQ ENT

[Ian White GM3SEK]

wayne burdick wrote:
>
>On Jan 30, 2009, at 12:37 PM, Ian White GM3SEK wrote:
>
>> When "Independence Day" arrives, will there be facilities to scan one
>> receiver independently of the other, on a different band?
>
>Scanning and text decode/display will still be usable only with the 
>main receiver, initially.
>
>73,
>Wayne
>N6KR

Thanks for the quick reply, Wayne.  When time permits, the first issue 
is to avoid overwriting the sub-rx frequency when a scan memory is 
recalled for use by the main rx.


-- 

73 from Ian GM3SEK
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Re: [Elecraft] Impossible mission? USB with the 13khz filter for PSK31on Digipan

[AD6XY]

Has anyone tried taking the K3s 2nd IF out to a high end soundcard and doing
the DSP on a PC?
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[Elecraft] [K1] SN 2682 is borne

[Ingo Meyer, DK3RED]

Hello Elecrafters,

On January 31 at 1515 UTC a new K1 was borne. She is alive and kicking. Their 
name is SN 
#2682. At the time she is playing with her big sister K2 #01118 outside at the 
antenna. 
There were no difficulty with the birth. Thanks to the intellectual fathers and 
kit packers!
-- 
73/72 de Ingo, DK3RED - Don't forget: the fun is the power!
www.qrp4fun.de - dk3...@qrp4fun.de

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Re: [Elecraft] Impossible mission? USB with the 13khz filter for PSK31on Digipan

[Thomas Tumino]

Thanks Joe for setting me straight on that.  It has been years since I had read 
about it.
 
So I guess this is only a PSK31 issue (or any software with panoramic receive) 
with an external computer, and minimal at that...still it would be nice...
 
73,
Tom

--- On Fri, 1/30/09, Joe Subich, W4TV  wrote:

From: Joe Subich, W4TV 
Subject: RE: [Elecraft] Impossible mission? USB with the 13khz filter for 
PSK31on Digipan
To: thomastum...@yahoo.com, elecraft@mailman.qth.net
Date: Friday, January 30, 2009, 9:10 PM

> I can only speak for Yaesu and Icom gear, but Yaesu 
> rigs specify 5Khz transmit FM in their manuals and in
> the Icom 706MKIIG service manual states FM deviation
> is adjusted for 4.5Khz.

There is a BIG difference between FM deviation and 
maximum modulating frequency (audio response).  I was 
speaking specifically to maximum modulating frequency. 

As Lyle has said elsewhere, the maximum modulating 
frequency in the K3 is limited to about 2.8 KHz - in 
all modes except ESSB - which results in an occupied 
bandwidth of about 15.5 KHz with 5 KHz of deviation 
for FM.  





> -Original Message-
> From: Thomas Tumino [mailto:thomastum...@yahoo.com] 
> Sent: Friday, January 30, 2009 1:33 PM
> To: li...@subich.com
> Subject: RE: [Elecraft] Impossible mission? USB with the 
> 13khz filter for PSK31on Digipan
> 
> 
> 
> 
> No, typical transmitted bandwidth for communications use - 
> including FM is about 100 Hz to 3000 Hz.  
> 
> I can only speak for Yaesu and Icom gear, but Yaesu 
> rigs specify 5Khz transmit FM in their manuals and in
> the Icom 706MKIIG service manual states FM deviation
> is adjusted for 4.5Khz.  I would assume
> this was the standard for all Yaesu and Icom gear
> at least.  Some Yaesu rigs do have a special 
> "FM-N" transmit mode of 2.5 Khz, similar to FRS radios,
> but I think that mode is the exception and not 
> the rule. 
> I think the DSP receive limit of 4Khz should at least
> be mentioned in the K3 materials (or perhaps it 
> is and I missed it?).  This bothers me as
> really I feel FM and AM are most regularly used 
> to enjoy audio of a better quality then SSB audio, 
> and a 4Khz limit cuts down on that a bit.
> 73 to all and thanks for your
>  help,
> Tom-N2YTF
>  
> 

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Re: [Elecraft] K3 Sub Rx idea

[Milt, N5IA]

Wayne,

The most undesireable aspect of BSET is the fact that the communication with 
the computer is interrupted.  The logging program dispays a pop-up window 
indicating lost communication if BSET is in use for more than a few seconds. 
At least that is my experience while using N1MM.

Milt, N5IA

- Original Message - 
From: "wayne burdick" 

> The BSET switch *is* intended as a context swap that allows the front
> panel to control the sub receiver. It already allows control of many

> 73,
> Wayne
> N6KR

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Re: [Elecraft] SHIFT pitch

[GM0ELP]

I note that I can use NORM during TX but not NORM I/II, is this in the fix
list?

Doug GM0ELP


Bill Johnson-9 wrote:
> 
> This is what I do on SSB.  Works great here.
> 
> 
> 73,
> 
> Bill
> K9YEQ
> 

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Re: [Elecraft] K3 - diversity reception question

[Dr. Werner Furlan]

hi Jo, 

you are right I can compensate for the volume loss with the filter gain on 
the SUB RX.  But it takes 8 dB to hear the signal in the middle...


73! de Werner OE9FWV


Joe Planisky schrieb am 30 Jan 2009 um 13:26:

> Maybe you have (or need?) different filter gains between the main and  sub
> filters?
> 
> 73
> --
> Joe KB8AP
> 
> On Jan 30, 2009, at 8:32 AM, Dr. Werner Furlan wrote:
> 
> > Maybe this has been discussed before, if so please forgive me...
> > When I switch on the Sub receiver listening on the headphones, the  right
> > channel disappears for a short instance, then comes back but with a 
> > slightly lower volume than the left (main RX) channel. Is this intended?
> > I use the Sub knob as balance pot. I have shared Ant 1 with the Sub
> > receiver.
> >
> > 73! de Werner OE9FWV


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Re: [Elecraft] K3 - diversity reception question

[Dr. Werner Furlan]

hi Wayne, 

wayne burdick schrieb am 30 Jan 2009 um 13:29:

> Using the MAIN antenna for the subreceiver switches in a -3 dB pad, 
> which is required to split the path to the two receivers. This results in
> about a 3 dB signal attenuation in both. This may be part of what you're
> hearing.
> 
> There also may be slight differences in overall path gain between the two
> receivers, even when configured identically. Here are some contributing
> factors:
> 
> 1. band-pass filter alignment and losses
> 2. 1st mixer loss
> 3. crystal filter loss
> 4. crystal filter ripple
> 5. physical alignment of the SUB AF control (when used as main/sub 
> BALANCE)
> 6. ears
> 
> It's quite plausible that overall receive gain could, therefore, differ by
> a few dB between main and sub receivers.
> 
> You could use the K3's built-in true-RMS AF voltmeter functions to 
> determine the exact amount, on each band (AFV/dBV).

I think I need some help with this. 
I have connected a noise gernerator to my ANT1 and I see AFV floating 
between 622 and 702 with SUB engaged,  and 1578 and 1719 without SUB. 
(this was on 3.670 kHz)

73! de Werner OE9FWV




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