Re: [Elecraft] Elecraft Digest, Vol 164, Issue 13

[Mike Lichtman via Elecraft]

I just received mine. It was ordered nov 27th and arrived today in CA. I never 
received anything other than an email receipt too. With Xmas mailings going on 
give it 3 wks then contact them if needed. Mike KF6KXG

Sent from my iPhone

> On Dec 14, 2017, at 2:42 PM, elecraft-requ...@mailman.qth.net wrote:
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> Today's Topics:
> 
>   1. Re: K3 / RF gain - S meter issue (carlo bianconi)
>   2. Re: FA-VA4 (Art)
>   3. Fwd: [PVRC] Voice waveform asymmetry limits your loudness
>  (Jim Miller)
>   4. Amplifiers (Brian Heinitz)
>   5. Re: K3 / RF gain - S meter issue - Similar issue (Dan Atchison)
>   6. Re: Amplifiers (Wes Stewart)
>   7. Re: KPA1500 (Wayne Burdick)
>   8. Re: FA-VA4 (Peter LaBissoniere)
>   9. Re: K3 / RF gain - S meter issue - Similar issue
>  (Bob McGraw K4TAX)
>  10. Re: KPA1500  (!) (Roy Koeppe)
>  11. Re: FA-VA4 (Jim Graves)
>  12. Re: K3 / RF gain - S meter issue (Bruce Meier)
>  13.  K3 / RF gain - S meter issue - Similar issue (Dan Atchison)
>  14. Re: FA-VA4 (Don Wilhelm)
>  15. Re: K3 / RF gain - S meter issue - Similar issue (Wes Stewart)
>  16. Re: FA-VA4 (n...@arrl.net)
>  17. K2 Knob (Michael Raskin)
>  18. KPA500 - fan noise (Bill)
>  19. Re: K2 Knob (Don Wilhelm)
>  20. FS: K3 RemoteRig from Elecraft (James Wilson)
>  21. KPA1500 First RF Review (W0FK)
>  22. Re: KPA1500 First RF Review (Wayne Burdick)
>  23. Re: KPA1500 First RF Review (AB4IQ)
>  24. Re: K3:  2 meter SSB/CW Capability Questions (Phil Hystad)
>  25.  KPA1500 First RF Review (John Harper)
> 
> 
> --
> 
> Message: 1
> Date: Thu, 14 Dec 2017 16:32:56 +0100
> From: carlo bianconi 
> To: elecraft@mailman.qth.net
> Subject: Re: [Elecraft] K3 / RF gain - S meter issue
> Message-ID: <5600e5de-b3ea-4870-4e5e-89aa21a52...@gmail.com>
> Content-Type: text/plain; charset=windows-1252; format=flowed
> 
> Hi Bruce,
> 
> try to reload the factory data calibration before doing the calibration 
> with a generator.
> 
> Usually it works.
> 
> 73, Carlo
> 
> Carlo Bianconi Telecomunicazioni Official Elecraft Dealer Via O.Trebbi 8/B 
> 40127 Bologna - Italy Ph. 0515878825 mail carlobianc...@iol.it 
> www.carlobianconi.com
> 
> Il 14/12/2017 14:38, Roger D Johnson ha scritto:
>> Is the S meter supposed to read 60 over 9 when the RF gain is turned 
>> all the way down?
>> 
>> Mine reads 30db!
>> 
>> 73, Roger
>> 
>> 
>> 
>>> On 12/13/2017 9:10 PM, Wes Stewart wrote:
>>> I would first perform the RF Gain calibration using the K3 Utility. 
>>> The calibration program measures gain characteristics and applies 
>>> software correction.
>>> 
>>> Then run the S-meter calibration.
>>> 
>>> Wes? N7WS
>>> 
 On 12/13/2017 2:25 PM, Bruce Meier wrote:
 Looking for suggestions here from someone that might have 
 experienced this
 same issue - -
 
 
 I have (2) K3 units (not the S model) that are acting different when 
 the RF
 gain adjustments are turned fully counter clockwise.
 
 ?? Unit one ? s/n 1062: When the RF gain is decreased to full counter
 clockwise position the S-Meter registers full scale (60db over S9) as
 expected.
 
 ?? Unit two ? s/n 1193:? When the RF gain is decreased to full counter
 clockwise position the S-Meter registers only S8.
 
 ? Facts:
 
 ?? With the exception of the S-Meter readings with RF gain settings, 
 both
 units are working fine
 
 ?? Both units have ?almost? all mods installed.? If not all, they 
 are at
 least both the same.
 
 ?? Both units are running the same version of microcode (5.54) 
 (2.88) (2.88)
 (1.26)
 
 ?? Both units seem to register very close actual RF gain of stations 
 when
 connected when tested on the same antenna
 
 ?? Both units have the new synthesizers.
 
 ?? Both units have second RX
 
 ?? In both cases (both units) I can hear the audio level decreasing 
 linearly
 as expected as the RF gain is turned counter clockwise
 
 I have tried to initialize the K3 and reload the firmware resulting 
 in no
 change to the RF gain / S-Meter readings.
 
 
 Elecraft Tech Support suggested:
 
 ?? Calibrating the s-meter ? did nothing
 
 ?? Next suggestion ? send the rig to California.
 
 
 Anyone have this issue and fixed it??
 
 
 73,
 
 Bruce N1LN
>>> 
>>> __

Re: [Elecraft] K3 / RF gain - S meter issue - Similar issue

[Al Lorona]

You said, "In my opinion based on inspection of the schematic, the issue 
resides in the fet 
post-filter amplifier that is controlled by the "hardware" AGC (and manual "RF" 
gain control)."

You were making a relationship between hardware AGC and the loose spec of the 
FET in question. By saying that, I understood you to mean that the hardware AGC 
signal was being interpreted differently by the problem K3 compared to a 
'normal' K3 because of this FET. At least this is what it seemed like. I will 
accept that I misunderstood you and that I have no idea what you were trying to 
say.

Al  W6LX
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Re: [Elecraft] K3 / RF gain - S meter issue - Similar issue

[Wes Stewart]

I don't think I said that.  I imagine the onset of hardware AGC is determined 
elsewhere.  What I am saying is that the dB/V gain change is non-linear and 
different from device to device.  I assumed, mistakenly it appears, that the 
bias voltage to the device was tailored via a lookup table to create a linear 
dB/V (if you can call dB linear) scale factor. Lyle's description, if I 
understand it correctly, says that they measure the gain control characteristic, 
but leave it be and correct the numbers via a table.


A much better choice here (IMHO of course) would have been something like an 
Analog Devices AD600 (See "A High-Performance AGC/IF Subsystem" by Bill Carver 
in QST, May 1996.)


Another place where the designers' QRP DNA got in the way of robust design was 
the choice of the second mixer.  The oft repeated claim that hardware AGC is 
protecting the DSP may be true, but the second mixer overload characteristics 
are even worse.


Wes  N7WS



On 12/14/2017 6:01 PM, Al Lorona wrote:

Wes stated that there's a component in the AGC circuit that changes the onset 
of hardware AGC due to component tolerances. I suggested putting that theory to 
the test by actually measuring it.

Al  W6LX


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Re: [Elecraft] K3 / RF gain - S meter issue - Similar issue

[Bill Johnson]

Isn't that answered by Lyle's point #10?

73,
Bill
K9YEQ

-Original Message-
From: elecraft-boun...@mailman.qth.net 
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Al Lorona
Sent: Thursday, December 14, 2017 7:02 PM
To: donw...@embarqmail.com; elecraft@mailman.qth.net
Subject: Re: [Elecraft] K3 / RF gain - S meter issue - Similar issue

Wes stated that there's a component in the AGC circuit that changes the onset 
of hardware AGC due to component tolerances. I suggested putting that theory to 
the test by actually measuring it.

Al  W6LX
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Re: [Elecraft] K3 / RF gain - S meter issue - Similar issue

[Al Lorona]

Wes stated that there's a component in the AGC circuit that changes the onset 
of hardware AGC due to component tolerances. I suggested putting that theory to 
the test by actually measuring it.

Al  W6LX
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Re: [Elecraft] K3 / RF gain - S meter issue - Similar issue

[Lyle Johnson]

There are several things going on here.

1) The "hardware AGC" is derived at the 15 kHz IF and is designed to 
prevent overdrive to the DSP's IF Analog-to-Digital Converter (ADC).  It 
also serves to prevent the 15 kHz IF amplifier from being driven into 
non-linear operation.


2) The "hardware AGC" voltage is fed to the 8.215 MHz IF amplifier.  By 
placing the gain control here, it also helps to prevent overload of the 
2nd Mixer (8.215 MHz -> 15 kHz).


3) The "RF Gain" control voltage is fed to the same point at the 8.215 
MHz IF stage.


4) The RF ATTenuator (0 or 10 dB in the K3, more choices in the K3S) and 
PREamp (one choice in the K3, up to two choices in the K3S) are applied 
in the radio prior to the first mixer or crystal filter.  They thus have 
an impact on the "hardware" AGC."


All of the above is independent of the DSP subsystem.

5) The "RF Gan Cal" works by injecting known voltages to the 8.215 MHz 
IF amplifier control point and measuring the subsequent change in gain.  
The DSP measures this and creates a table.  Due to dynamic range 
limitations of the measuring system, the calibration procedure requires 
two signals levels to be injected. In the case of the higher level 
signal not being available, the factory default values are used.  Due to 
variations in the gain control led stage, there may be the change in S 
Meter indication that some of you have observed at high signal (or 
severely reduced RF Gain control) conditions.


In general, if you are going to do the RF Gain calibration, you really 
should use both signal levels.  The XG3 specifically provides the 
required levels.


6) The DSP regularly measures the control voltage to the 8.215 MHz IF 
amplifier. The RF Gain Cal information is used by the DSP when it then 
calculates the signal level in the IF passband.  It is not part of the 
signal control loop; it is strictly a measure and report function.


7) The DSP takes into account the PRE and ATT status provided by the MCU 
in the S Meter ABS mode; it ignores such information in the S Meter NOR 
mode.


8) The S Meter calculation is prior to the DSP's AGC algorithms so the S 
Meter is not affected by THR, SLP or other AGC-related settings.


9) The DSP presents the results of the S Meter calculation to the 
radio's MCU via a DAC voltage that is only routed to the MCU -- it has 
no other function in the radio.


10) The S Meter OFS and SCL values are used by the MCU (not the DSP) to 
manage the S Meter display of the DSP's DAC voltage on the K3's LCD.


Enjoy!

73,

Lyle KK7P
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[Elecraft] FS: K3 RemoteRig from Elecraft

[James Wilson]

The RemoteRig set has been sold - pending payment

Many thanks to all,

73

Jim - W4RKS
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Re: [Elecraft] KPA1500 First RF Review

[Michael Walker]

I have no 30M power limitations in Canada.  It is just another ham band and
treated as such.

Mike va3mw


On Thu, Dec 14, 2017 at 7:31 PM, David Gilbert 
wrote:

>
>
> And it works on 30m as well.
>
> I wonder when the last time the FCC busted anyone for excess power, though.
>
> Dave   AB7E
>
>
> On 12/14/2017 3:42 PM, John Harper wrote:
>
>> Here's your 3500 watt amp, listing Elecraft compatibility:
>> http://www.kojinsha.jp/kl-1en/
>>
>> Only $10k and possibly a visit from the FCC!
>>
>> John AE5X
>> https://ae5x.blogspot.com
>>
>>
>> What! 3500 watts out?!?! How is that possible?
>>>
>> __
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>>
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Re: [Elecraft] KPA1500 First RF Review

[David Gilbert]

And it works on 30m as well.

I wonder when the last time the FCC busted anyone for excess power, though.

Dave   AB7E


On 12/14/2017 3:42 PM, John Harper wrote:

Here's your 3500 watt amp, listing Elecraft compatibility:
http://www.kojinsha.jp/kl-1en/

Only $10k and possibly a visit from the FCC!

John AE5X
https://ae5x.blogspot.com



What! 3500 watts out?!?! How is that possible?

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Re: [Elecraft] K3 / RF gain - S meter issue - Similar issue

[Don Wilhelm]

Al,

My understanding of the hardware AGC is that it is fixed and is not 
dependent on the menu AGC parameters.  The AGC THR and SLP are strictly 
DSP parameters.


The Hardware AGC is there only to protect the ADC from overload due to 
strong signals.


There may some variation in the exact level that the Hardware AGC kicks 
in form K3 to K3 due to component tolerances.


The fact that the manual RF gain operates at the Hardware AGC point may 
be sufficient explanation that the RF Gain Control when at full 
counterclockwise position does not drive the S-meter to full scale 
(again due to component tolerances).


The real question in my mind is whether the K3 S-meter responds properly 
at its calibration points of S-9 and S-9+30.  And those points are 
correct with the RF Gain at full clockwise rotation.  Those calibration 
points are determined in the DSP section, and not in the hardware part 
of the K3.


73,
Don W3FPR

On 12/14/2017 6:40 PM, Al Lorona wrote:

This would be easy to test. Normally, 'hardware AGC' kicks in at an input 
signal level of -46 dBm or so. This point is essentially independent of the AGC 
THR and SLP settings. See if your K3 varies from this data point anomalously.

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Re: [Elecraft] K3 / RF gain - S meter issue - Similar issue

[Al Lorona]

This would be easy to test. Normally, 'hardware AGC' kicks in at an input 
signal level of -46 dBm or so. This point is essentially independent of the AGC 
THR and SLP settings. See if your K3 varies from this data point anomalously.

Al  W6LX



__
In my opinion based on inspection of the schematic, the issue resides in the 
fet 
post-filter amplifier that is controlled by the "hardware" AGC (and manual "RF" 
gain control)  The specs on this device are very loose, IIRC, Gm can vary 2:1.  
Thus the response of this fet to AGC/RF gain varies from radio to radio 

Wes  N7WS
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Re: [Elecraft] KPA1500 First RF Review

[Wes Stewart]

Should do more than 3500W.

On 12/14/2017 3:42 PM, John Harper wrote:

Here's your 3500 watt amp, listing Elecraft compatibility:
http://www.kojinsha.jp/kl-1en/

Only $10k and possibly a visit from the FCC!

John AE5X
https://ae5x.blogspot.com



What! 3500 watts out?!?! How is that possible?

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[Elecraft] KPA1500 First RF Review

[John Harper]

Here's your 3500 watt amp, listing Elecraft compatibility:
http://www.kojinsha.jp/kl-1en/

Only $10k and possibly a visit from the FCC!

John AE5X
https://ae5x.blogspot.com


>What! 3500 watts out?!?! How is that possible?
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Re: [Elecraft] K3: 2 meter SSB/CW Capability Questions

[Phil Hystad]

Thanks for the comments I got and answers to my question (below).  I will 
probably go with the K144XV plus reference lock board but will wait until it is 
warmer weather to get my 2-meter antenna up.

73, phil, K7PEH



> On Dec 13, 2017, at 5:50 PM, Phil Hystad  wrote:
> 
> I would like to have a “weak” signal, SSB/CW, capability on 2 meters.  I have 
> three ways of achieving that for my K3:
> 
> 1.  The K3 (K3S) K144XV built-in 2-meter option module at $469.90 (price 
> includes the K144RFLK reference lock board).
> 
> 2.  The external XV144 transverter at $479.95.
> 
> 3.  A third-party, non-Elecraft solution which I have not really considered.
> 
> First, clarification, I understand that the XV144 works with the K3 and I 
> also understand that it is older technology compared to the K144XV but I have 
> no idea if this matters.  The advantage I see of the XV144 transverter is 
> that it provides higher output at 20 to 25 watts.
> 
> What are the pro/con of these two different (items 1 and 2) ways of getting 
> 2-meter capability.  Note: I have no interest in FM.
> 
> Thanks,
> 73, phil, K7PEH
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Re: [Elecraft] KPA1500 First RF Review

[AB4IQ]

Well I told Laura (KF4CXO) that I was getting her something special and that it 
was so quiet she wouldn't even know what I got her.  I'm working FT8 as we 
speak on 30 meters and trying to read emails at the same time and not laugh to 
much.

Ed... AB4IQ

-Original Message-
From: elecraft-boun...@mailman.qth.net 
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Wayne Burdick
Sent: Thursday, December 14, 2017 3:49 PM
To: W0FK 
Cc: Elecraft Reflector 
Subject: Re: [Elecraft] KPA1500 First RF Review

Right, Lou. You’re also getting a KX9 in your stocking. And your wife gets the 
complimentary purse unicorn.

73.5,
Wayne
N6KR


> On Dec 14, 2017, at 1:36 PM, W0FK  wrote:
> 
> I received my KPA1500 late yesterday. Contrary to pronouncements on 
> the forum by Elecraft, they’re ready to ship. Since I was first to 
> order the amp and sent in “something special” to Eric and Wayne, I got 
> mine a week before the established release to the general ham 
> populace.  Sorry guys, looks like I’m the lucky one this time.
> 
> I popped on the 220 connector I needed, reset the voltage to 220 on 
> the PS, and placed it below my bench on a rolling cart. I ran the 
> cable up to my equipment shelf, slid the RF deck on my shelf and connected 
> the cable.
> Beautiful, matching gray to the rest of the K-Line. I connected the 
> cables to my K3S, and powered it all up. The display on the amp 
> scrolled “Elecraft KPA1500” and the lights flashed through multiple 
> colors until they set in standby mode. I hit the switch to “operate,” 
> set the antenna switch to my dummy load, set RF out to the usual 35 watts on 
> my K3S, and keyed the amp.
> 
> What! 3500 watts out?!?! How is that possible?
> 
> I then noticed a small 3M yellow sticky attached to the side of the 
> amp. I pulled it off saw a handwritten note from Wayne. “Lou – you got 
> a special first version of the amp. It had 4 finals in it, and a larger power 
> supply.
> We plan on releasing it at Dayton 2018, but since you’re a special 
> customer, wanted you to be first to own this heretofore unannounced 
> beauty. Merry Xmas!”
> 
> I sat back in my chair, stunned. How can this be? What a great present!
> 
> Then I heard a noise. I looked at the amp, and the display was 
> flashing, in bright red, “07:00”, “07:00”, and there was a loud 
> buzzing. My mind raced, and I heard my wife, saying “wake up already and turn 
> off that damn alarm!”
> 
> I rubbed my eyes after turning off the alarm and realized it had been 
> a dream. Looks like I have to wait like everyone else. And no 3500 
> watt special.
> 
> Yet….
> 
> Merry Xmas everyone! ;-)



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Re: [Elecraft] KPA1500 First RF Review

[Wayne Burdick]

Right, Lou. You’re also getting a KX9 in your stocking. And your wife gets the 
complimentary purse unicorn.

73.5,
Wayne
N6KR


> On Dec 14, 2017, at 1:36 PM, W0FK  wrote:
> 
> I received my KPA1500 late yesterday. Contrary to pronouncements on the forum
> by Elecraft, they’re ready to ship. Since I was first to order the amp and
> sent in “something special” to Eric and Wayne, I got mine a week before the
> established release to the general ham populace.  Sorry guys, looks like I’m
> the lucky one this time.
> 
> I popped on the 220 connector I needed, reset the voltage to 220 on the PS,
> and placed it below my bench on a rolling cart. I ran the cable up to my
> equipment shelf, slid the RF deck on my shelf and connected the cable.
> Beautiful, matching gray to the rest of the K-Line. I connected the cables
> to my K3S, and powered it all up. The display on the amp scrolled “Elecraft
> KPA1500” and the lights flashed through multiple colors until they set in
> standby mode. I hit the switch to “operate,” set the antenna switch to my
> dummy load, set RF out to the usual 35 watts on my K3S, and keyed the amp. 
> 
> What! 3500 watts out?!?! How is that possible?
> 
> I then noticed a small 3M yellow sticky attached to the side of the amp. I
> pulled it off saw a handwritten note from Wayne. “Lou – you got a special
> first version of the amp. It had 4 finals in it, and a larger power supply.
> We plan on releasing it at Dayton 2018, but since you’re a special customer,
> wanted you to be first to own this heretofore unannounced beauty. Merry
> Xmas!” 
> 
> I sat back in my chair, stunned. How can this be? What a great present!
> 
> Then I heard a noise. I looked at the amp, and the display was flashing, in
> bright red, “07:00”, “07:00”, and there was a loud buzzing. My mind raced,
> and I heard my wife, saying “wake up already and turn off that damn alarm!”
> 
> I rubbed my eyes after turning off the alarm and realized it had been a
> dream. Looks like I have to wait like everyone else. And no 3500 watt
> special.
> 
> Yet….
> 
> Merry Xmas everyone! ;-)



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[Elecraft] KPA1500 First RF Review

[W0FK]

I received my KPA1500 late yesterday. Contrary to pronouncements on the forum
by Elecraft, they’re ready to ship. Since I was first to order the amp and
sent in “something special” to Eric and Wayne, I got mine a week before the
established release to the general ham populace.  Sorry guys, looks like I’m
the lucky one this time.
  
I popped on the 220 connector I needed, reset the voltage to 220 on the PS,
and placed it below my bench on a rolling cart. I ran the cable up to my
equipment shelf, slid the RF deck on my shelf and connected the cable.
Beautiful, matching gray to the rest of the K-Line. I connected the cables
to my K3S, and powered it all up. The display on the amp scrolled “Elecraft
KPA1500” and the lights flashed through multiple colors until they set in
standby mode. I hit the switch to “operate,” set the antenna switch to my
dummy load, set RF out to the usual 35 watts on my K3S, and keyed the amp. 
  
What! 3500 watts out?!?! How is that possible?
   
I then noticed a small 3M yellow sticky attached to the side of the amp. I
pulled it off saw a handwritten note from Wayne. “Lou – you got a special
first version of the amp. It had 4 finals in it, and a larger power supply.
We plan on releasing it at Dayton 2018, but since you’re a special customer,
wanted you to be first to own this heretofore unannounced beauty. Merry
Xmas!” 
  
I sat back in my chair, stunned. How can this be? What a great present!
  
Then I heard a noise. I looked at the amp, and the display was flashing, in
bright red, “07:00”, “07:00”, and there was a loud buzzing. My mind raced,
and I heard my wife, saying “wake up already and turn off that damn alarm!”
  
I rubbed my eyes after turning off the alarm and realized it had been a
dream. Looks like I have to wait like everyone else. And no 3500 watt
special.
 
Yet….
   
Merry Xmas everyone! ;-)
 



-
St. Louis, MO


--
Sent from: http://elecraft.365791.n2.nabble.com/
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[Elecraft] FS: K3 RemoteRig from Elecraft

[James Wilson]

I have a like-new RemoteRig set that I am not going
to use. Comes with cable set for remoting  K3 to K3.

RR-1256 SET was $499.95 from Elecraft
RRK3CBL cable set was $49.95
RRMTCBL cable set was $49.95

Total cost was $599.75

Asking $400 shipped CONUS

Contact me direct at w4rks73 at gmail dot com
I'm good in QRZ

Jim - W4RKS
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Re: [Elecraft] K2 Knob

[Don Wilhelm]

Mike,

Which knob do you have?
There are two shaft diameters.  The one for the original encoder is 
smaller than the one for the new encoder (with a 1/4 inch shaft).


The new encoder will accept the VFO knob for the KX3, and that is what 
is shipping with the new K2 Kits, but it needs 3 stacked felt washers to 
provide a bit of drag on the knob.
The encoder is so smooth that you must have some drag on the knob to 
keep the frequency from moving when you remove your hand from the knob.


The prior knobs are no longer available.

73,
Don W3FPR

On 12/14/2017 3:00 PM, Michael Raskin wrote:

Looking for a VFO knob for my K2.  Does someone have an extra they want to sell 
me?

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[Elecraft] KPA500 - fan noise

[Bill]

Interesting post from Wayne regarding the low fan noise from the 
KPA1500. So, I have to ask about fan noise and the KPA500.


Background: I run my KPA500 all the time - my K3 is a 500 Watt XCVR. 
From time to time, in particular during AM operation, the fan comes on 
and moves right on up in the noise department. Enough, that I have 
considered changing the location of the amp or redesigning my desk and 
putting a door across the shelf the amp lives on (open to the back and 
lots of room of course).


Question: Has anyone successfully reduced the fan noise of the KPA500 by 
fan replacement? If so, please tell me what you did.


Thanks, Bill W2BLC K-Line

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[Elecraft] K2 Knob

[Michael Raskin]

Looking for a VFO knob for my K2.  Does someone have an extra they want to sell 
me?

Mike, W4UM
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Re: [Elecraft] FA-VA4

[n...@arrl.net]

Got mine yesterday,  fast build.It works..Bill

Sent from my Sprint Samsung Galaxy S® 6.
 Original message From: Don Wilhelm  
Date: 12/14/17  1:43 PM  (GMT-05:00) To: Art , 
elecraft@mailman.qth.net Subject: Re: [Elecraft] FA-VA4 
I ordered one Dec 1 and it came in only yesterday.  I am in North Carolina.

73,
Don W3FPR

On 12/14/2017 10:36 AM, Art via Elecraft wrote:
> After reading several posts here about this antenna analyzer kit, I decided 
> to order one on Dec. 2. Got the confirmation immediately, but never received 
> any shipping notice or the product. I have sent two inquires that have gone 
> unanswered.
> 
> 
> Has anyone had any experience with the company? Any suggestions?
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Re: [Elecraft] K3 / RF gain - S meter issue - Similar issue

[Wes Stewart]

Personally, I wouldn't go so far as to say the radio performs correctly. Without 
writing a long history, let's just say that I discovered this RF gain issue 8 or 
9 years ago.  I demonstrated it to an Elecraft engineer in my shack who had 
brought along his fully up to date K3 which we compared.  They were widely 
different.  Subsequently, I did a lot of beta testing of firmware that I believe 
spawned the RF gain calibration program.


In my opinion based on inspection of the schematic, the issue resides in the fet 
post-filter amplifier that is controlled by the "hardware" AGC (and manual "RF" 
gain control)  The specs on this device are very loose, IIRC, Gm can vary 2:1.  
Thus the response of this fet to AGC/RF gain varies from radio to radio, and as 
seen in another post, between the main RX and second RX in the same radio.  As I 
understand it, and I would love for someone at Elecraft to correct me if I'm 
wrong, the RF gain calibration program measures the radio gain control 
characteristics and generates a lookup table of correction factors to apply to 
linearize the control.


If I'm correct, I always been troubled by questions about the speed of this 
process.  Being an analog guy I understand resistor-diode networks used for 
similar purposes that operate essentially instantaneously.   The digital process 
not so much.


Wes  N7WS



On 12/14/2017 9:16 AM, Dan Atchison via Elecraft wrote:

I have a similar - but different! - issue on one of my Elecraft's.

I own both a K3 and a K3s.  Both are configured equally with the K3 having 
been upgraded to the highest level to achieve near K3s equivalency.


My K3s RF Gain control works exactly as expected, i.e. as the control is 
rotated counter-clockwise the "S-Meter" increases to a point at almost full 
scale.


On the K3, however, as the RF Gain control is rotated counter-clockwise and 
the "S-Meter" increases to about the "40-over" point at the control's 10 
o'clock position the "S-Meter" then inexplicably drops to the "S9" position 
where it remains for the remainder of the RF gain control counter-clockwise 
rotation. This shouldn't be but like N1LN's issue, the radio does otherwise 
perform correctly.  I have done everything that N1LN has done including the RF 
Gain calibration using a signal generator.


Very strange, indeed.

Dan -- N3ND

*

Date: Wed, 13 Dec 2017 16:25:20 -0500
From: "Bruce Meier"
To:
Subject: [Elecraft] K3 / RF gain - S meter issue


Looking for suggestions here from someone that might have experienced this
same issue - -



I have (2) K3 units (not the S model) that are acting different when the RF
gain adjustments are turned fully counter clockwise.

?  Unit one ? s/n 1062: When the RF gain is decreased to full counter
clockwise position the S-Meter registers full scale (60db over S9) as
expected.

?  Unit two ? s/n 1193:  When the RF gain is decreased to full counter
clockwise position the S-Meter registers only S8.

 Facts:

?  With the exception of the S-Meter readings with RF gain settings, both
units are working fine

?  Both units have ?almost? all mods installed.  If not all, they are at
least both the same.

?  Both units are running the same version of microcode (5.54) (2.88) (2.88)
(1.26)

?  Both units seem to register very close actual RF gain of stations when
connected when tested on the same antenna

?  Both units have the new synthesizers.

?  Both units have second RX

?  In both cases (both units) I can hear the audio level decreasing linearly
as expected as the RF gain is turned counter clockwise

I have tried to initialize the K3 and reload the firmware resulting in no
change to the RF gain / S-Meter readings.



Elecraft Tech Support suggested:

?  Calibrating the s-meter ? did nothing

?  Next suggestion ? send the rig to California.



Anyone have this issue and fixed it??



73,

Bruce N1LN



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Re: [Elecraft] FA-VA4

[Don Wilhelm]

I ordered one Dec 1 and it came in only yesterday.  I am in North Carolina.

73,
Don W3FPR

On 12/14/2017 10:36 AM, Art via Elecraft wrote:

After reading several posts here about this antenna analyzer kit, I decided to 
order one on Dec. 2. Got the confirmation immediately, but never received any 
shipping notice or the product. I have sent two inquires that have gone 
unanswered.


Has anyone had any experience with the company? Any suggestions?

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[Elecraft] K3 / RF gain - S meter issue - Similar issue

[Dan Atchison via Elecraft]

More info.

Thanks to Brian, K3KO, some hints were given to check my particular 
issue.  Thanks also to Bob, K4TAX.


Since I have no intention of opening my radio (as the radio does work 
fine), I have discovered something of interest and a potential cause for 
the symptom I'm seeing.


As I apply a high signal level into the radio, I reach a point where the 
S-Meter behaves exactly like rotating the RF Gain control 
counter-clockwise (the reading drops).  This is easily duplicated.


Brian noted that perhaps what I am seeing is being caused by the K3 
Automatic Front-End Protection modification which my radio had its 
modification years ago.  The mod protection works as designed while 
injecting a high signal level into the K3, and I do see where the preamp 
(if engaged) is disabled.  Furthermore, I see HI SIG displayed in the K3 
VFO-B area.


Interestingly, my symptom happens at the same "signal level" the S-Meter 
reacts to with preamp disengagement, but without an injected signal just 
by rotating counter-clockwise the RF Gain control.  I do not, however, 
see the HI SIG level notification during this test and it matters not if 
the preamp is engaged or disengaged.  That said, the resultant S-Meter 
reading that had been "dropped" does follow both attenuation and preamp 
values.


Brian might be on to something!

Again, no intention of pursuing further unless Elecraft can duplicate 
and create a mod.


73 and thanks for the BW,
Dan



*


 [Elecraft] K3 / RF gain - S meter issue - Similar issue

*Bob McGraw K4TAX* rmcgraw at blomand.net 





My concern would be "does the S meter indicate correctly?"

Thus with 50 uV applied to the antenna input it should read S-9, and
with 0.78 uV applied it should read S-3, and with 5000 uV applied it
should read S-9 +40 dB.    I've checked my K3S at these and other values
and I'm confident that the S meter is accurate. Hence, I'm confident I
can give accurate signal reports.  Thus unlike many radios and their S
meters, they are only good for a rather unscientific and largely
inaccurate signal report, somewhat like a SWAG.

73

Bob, K4TAX


On 12/14/2017 10:16 AM, Dan Atchison via Elecraft wrote:
/I have a similar - but different! - issue on one of my Elecraft's. />//>/I own both a K3 and a K3s.  Both are configured equally with the K3 />/having been upgraded to the highest level to achieve near K3s />/equivalency. />//>/My K3s RF Gain control works exactly as expected, i.e. as the control />/is rotated counter-clockwise the "S-Meter" increases to a point at />/almost full scale. />//>/On the K3, however, as the RF Gain control is rotated />/counter-clockwise and the "S-Meter" increases to about the "40-over" />/point at the control's 10 o'clock position the "S-Meter" then />/inexplicably drops to the "S9" position where it remains for the />/remainder of the RF gain control counter-clockwise rotation. This />/shouldn't be but like N1LN's issue, the radio does otherwise perform />/correctly.  I have done everything that N1LN has done including the RF />/Gain calibration using a signal generator. />//>/Very strange, indeed. />//>/Dan -- N3ND />//>/* />//>/Date: Wed, 13 Dec 2017 16:25:20 -0500 />/From: "Bruce Meier"> />/To:> />/Subject: [Elecraft] K3 / RF gain - S meter issue />//>//>/Looking for suggestions here from someone that might have experienced />/this />/same issue - - />//>//>//>/I have (2) K3 units (not the S model) that are acting different when />/the RF />/gain adjustments are turned fully counter clockwise. />//>/?  Unit one ? s/n 1062: When the RF gain is decreased to full counter />/clockwise position the S-Meter registers full scale (60db over S9) as />/expected. />//>/?  Unit two ? s/n 1193:  When the RF gain is decreased to full counter />/clockwise position the S-Meter registers only S8. />//>/  Facts: />//>/?  With the exception of the S-Meter readings with RF gain settings, both />/units are working fine />//>/?  Both units have ?almost? all mods installed.  If not all, they are at />/least both the same. />//>/?  Both units are running the same version of microcode (5.54) (2.88) />/(2.88) />/(1.26) />//>/?  Both units seem to register very close actual RF gain of stations when />/connected when tested on the same antenna />//>/?  Both units have the new synthesizers. />//>/?  Both units have second RX />//>/?  In both cases (both units) I can hear the audio level decreasing />/linearly />/as expected as the RF gain is turned counter clockwise />//>/I have tried to initialize the K3 and reload the firmware re

Re: [Elecraft] K3 / RF gain - S meter issue

[Bruce Meier]

Thanks for the responses – here are the answers to the questions and
suggestions and a new piece of DATA associated with selecting the SUB-RX.

 

1.   I checked the S-Meter configs for both of my K3s – they are exactly
the same.

a.   SMTR OF  016

b.  SMTR SC  016

c.   SMTR PK OFF

d.  SMTR MD ABS

 

2.   I then ran RF Gain calibration using “Factory default RF Gain
Calibration data” as I don’t have the necessary test equipment

a.   Ran for both main and sub-RX

 

Ø  No change to the symptom on the suspect K3

 

3.   Just for the heck of it – I reloaded the currently installed
firmware using the K3 Utility 1.15.12.7

a.   MCU: 05.54

b.  DSP (both main/sub): 2.88

c.   FPF: 01.26

 

Ø  NO CHANGE

 

4.   I then downloaded the most recent firmware – only change MCU is now
05.60

 

Ø  No change

 

5.   I then selected the SUB RX – not sure why just did it.

a.   When I turn the RF gain counter clockwise the S-Meter increases to
60db over S9

b.  When I turn the Sub RX off – the S-Meter only increases to S7

 

NOTE:  I never tried this before, but it appears to be an interesting piece
of data.  Does this now point toward the Main RX in some way?

 

 

73,

Bruce – N1LN

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Re: [Elecraft] FA-VA4

[Jim Graves]

I ordered the FA-VA4 on Nov 20th and it arrived in great condition on Dec 
8th.
My order was shipped on Nov 24th but I did not receive any shipping notice 
so I sent an inquiry which they promptly replied to with tracking number.
I have not read anything negative about the analyzer, only very positive 
comments.

Merry Christmas to all!
Jim G. W4JRG
===

-Original Message- 
From: Peter LaBissoniere

Sent: Thursday, December 14, 2017 11:34 AM
To: Art
Cc: elecraft@mailman.qth.net
Subject: Re: [Elecraft] FA-VA4

Art, I ordered one back in October and it arrived about 3 weeks later. Now I 
need to actually build it!


On Dec 14, 2017, at 9:36 AM, Art via Elecraft  
wrote:


After reading several posts here about this antenna analyzer kit, I 
decided to order one on Dec. 2. Got the confirmation immediately, but 
never received any shipping notice or the product. I have sent two 
inquires that have gone unanswered.


Has anyone had any experience with the company? Any suggestions?

73 and Merry Christmas,

Art KZ5D


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Re: [Elecraft] KPA1500 (!)

[Roy Koeppe]

'twas said,
"...And thanks to the latest changes, hunt-and-pounce ops, like me, will 
almost never hear a fan come on."  (etc.)


GREAT

73,   Roy  K6XK 



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Re: [Elecraft] K3 / RF gain - S meter issue - Similar issue

[Bob McGraw K4TAX]

My concern would be "does the S meter indicate correctly?"

Thus with 50 uV applied to the antenna input it should read S-9, and 
with 0.78 uV applied it should read S-3, and with 5000 uV applied it 
should read S-9 +40 dB.    I've checked my K3S at these and other values 
and I'm confident that the S meter is accurate. Hence, I'm confident I 
can give accurate signal reports.  Thus unlike many radios and their S 
meters, they are only good for a rather unscientific and largely 
inaccurate signal report, somewhat like a SWAG.


73

Bob, K4TAX


On 12/14/2017 10:16 AM, Dan Atchison via Elecraft wrote:

I have a similar - but different! - issue on one of my Elecraft's.

I own both a K3 and a K3s.  Both are configured equally with the K3 
having been upgraded to the highest level to achieve near K3s 
equivalency.


My K3s RF Gain control works exactly as expected, i.e. as the control 
is rotated counter-clockwise the "S-Meter" increases to a point at 
almost full scale.


On the K3, however, as the RF Gain control is rotated 
counter-clockwise and the "S-Meter" increases to about the "40-over" 
point at the control's 10 o'clock position the "S-Meter" then 
inexplicably drops to the "S9" position where it remains for the 
remainder of the RF gain control counter-clockwise rotation. This 
shouldn't be but like N1LN's issue, the radio does otherwise perform 
correctly.  I have done everything that N1LN has done including the RF 
Gain calibration using a signal generator.


Very strange, indeed.

Dan -- N3ND

*

Date: Wed, 13 Dec 2017 16:25:20 -0500
From: "Bruce Meier"
To:
Subject: [Elecraft] K3 / RF gain - S meter issue


Looking for suggestions here from someone that might have experienced 
this

same issue - -



I have (2) K3 units (not the S model) that are acting different when 
the RF

gain adjustments are turned fully counter clockwise.

?  Unit one ? s/n 1062: When the RF gain is decreased to full counter
clockwise position the S-Meter registers full scale (60db over S9) as
expected.

?  Unit two ? s/n 1193:  When the RF gain is decreased to full counter
clockwise position the S-Meter registers only S8.

 Facts:

?  With the exception of the S-Meter readings with RF gain settings, both
units are working fine

?  Both units have ?almost? all mods installed.  If not all, they are at
least both the same.

?  Both units are running the same version of microcode (5.54) (2.88) 
(2.88)

(1.26)

?  Both units seem to register very close actual RF gain of stations when
connected when tested on the same antenna

?  Both units have the new synthesizers.

?  Both units have second RX

?  In both cases (both units) I can hear the audio level decreasing 
linearly

as expected as the RF gain is turned counter clockwise

I have tried to initialize the K3 and reload the firmware resulting in no
change to the RF gain / S-Meter readings.



Elecraft Tech Support suggested:

?  Calibrating the s-meter ? did nothing

?  Next suggestion ? send the rig to California.



Anyone have this issue and fixed it??



73,

Bruce N1LN



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Re: [Elecraft] FA-VA4

[Peter LaBissoniere]

Art, I ordered one back in October and it arrived about 3 weeks later. Now I 
need to actually build it!


> On Dec 14, 2017, at 9:36 AM, Art via Elecraft  
> wrote:
> 
> After reading several posts here about this antenna analyzer kit, I decided 
> to order one on Dec. 2. Got the confirmation immediately, but never received 
> any shipping notice or the product. I have sent two inquires that have gone 
> unanswered.
> 
> 
> Has anyone had any experience with the company? Any suggestions?
> 
> 
> 73 and Merry Christmas,
> 
> 
> Art KZ5D
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Re: [Elecraft] KPA1500

[Wayne Burdick]

> ROBERT MUELLER  wrote:
> 
> Why don't we tell Wayne it is time to stop tweaking.


You guessed it, Bob; you can blame me for the final tweaks. I do most of my 
operating with small radios that have no fans, so I’ve been obsessing over the 
KPA1500’s acoustics. 

As mentioned in the last update, we made changes to the power supply fans that 
dramatically reduced their sound level (by about 15 dB). Then, last week, we 
applied the same technique to the RF deck, with excellent results. In a 
20-minute brick-on-key test on 40 meters, the fans cycled between speeds 2 and 
3. Previously it had been speeds 4 and 5. I feel that these changes, which 
required ordering some different components, are well worth the trouble.

Seriously, you guys are going to love this amp. I’m a QRP guy at heart, but 
even I have to admit that hitting the key at 1500 W is a bit of a rush, 
especially on an amp that keys silently, like our smaller radios. And thanks to 
the latest changes, hunt-and-pounce ops, like me, will almost never hear a fan 
come on.

73,
Wayne
N6KR



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Re: [Elecraft] Amplifiers

[Wes Stewart]

Maybe I dozed off during that nearly three hour fireside chat but I came away 
disappointed.  I wanted some meat about things like IMD, an issue Elecraft has 
plenty of, device selection, biasing, power control, matching and so forth.


Wes  N7WS

On 12/14/2017 9:06 AM, Brian Heinitz wrote:

With all of the anticipation about the KPA 1500, a timely and informative 
discussion of that product and amplifiers in general can be heard on episode 38 
of the Workbench podcast at Ham Radio 360.

David Shoaf KG6IRW from Elecraft is interviewed by Workbench podcast hosts (and 
Elecraft product owners) George KJ6VU and Jeremy KF7IJZ. This edition of the 
podcast does a great job of explaining the design philosophy of the KPA 1500 
(and KPA 500) and discusses considerations any ham should think about when 
planning on adding an amplifier to their shack.

If you are not familiar, the Workbench podcast is one of three podcasts 
produced under the Ham Radio 360 umbrella. The Workbench is specifically 
focused on the hands-on DIY or “maker” side of our hobby and as such offers a 
deeper dive into some of the more technical aspects of the hobby. The other two 
podcasts focus on portable or field operations (great for KX3/KX2 users) and on 
the hobby in general. Elecraft is a sponsor of the podcast, and I highly 
recommend them to you.

Here’s the link to episode 38 on amplifiers with David Shoaf KG6IRW:

http://hamradio360.com/index.php/2017/12/05/ham-radio-workbench-37-hf-amplifiers-with-kg6irw/

Brian Heinitz
K1 / K2 and multiple mini modules
KI7LKB
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Re: [Elecraft] K3 / RF gain - S meter issue - Similar issue

[Dan Atchison via Elecraft]

I have a similar - but different! - issue on one of my Elecraft's.

I own both a K3 and a K3s.  Both are configured equally with the K3 
having been upgraded to the highest level to achieve near K3s equivalency.


My K3s RF Gain control works exactly as expected, i.e. as the control is 
rotated counter-clockwise the "S-Meter" increases to a point at almost 
full scale.


On the K3, however, as the RF Gain control is rotated counter-clockwise 
and the "S-Meter" increases to about the "40-over" point at the 
control's 10 o'clock position the "S-Meter" then inexplicably drops to 
the "S9" position where it remains for the remainder of the RF gain 
control counter-clockwise rotation.  This shouldn't be but like N1LN's 
issue, the radio does otherwise perform correctly.  I have done 
everything that N1LN has done including the RF Gain calibration using a 
signal generator.


Very strange, indeed.

Dan -- N3ND

*

Date: Wed, 13 Dec 2017 16:25:20 -0500
From: "Bruce Meier"
To:
Subject: [Elecraft] K3 / RF gain - S meter issue


Looking for suggestions here from someone that might have experienced this
same issue - -

 


I have (2) K3 units (not the S model) that are acting different when the RF
gain adjustments are turned fully counter clockwise.

?  Unit one ? s/n 1062: When the RF gain is decreased to full counter
clockwise position the S-Meter registers full scale (60db over S9) as
expected.

?  Unit two ? s/n 1193:  When the RF gain is decreased to full counter
clockwise position the S-Meter registers only S8.

 Facts:

?  With the exception of the S-Meter readings with RF gain settings, both
units are working fine

?  Both units have ?almost? all mods installed.  If not all, they are at
least both the same.

?  Both units are running the same version of microcode (5.54) (2.88) (2.88)
(1.26)

?  Both units seem to register very close actual RF gain of stations when
connected when tested on the same antenna

?  Both units have the new synthesizers.

?  Both units have second RX

?  In both cases (both units) I can hear the audio level decreasing linearly
as expected as the RF gain is turned counter clockwise

I have tried to initialize the K3 and reload the firmware resulting in no
change to the RF gain / S-Meter readings.

 


Elecraft Tech Support suggested:

?  Calibrating the s-meter ? did nothing

?  Next suggestion ? send the rig to California.

 


Anyone have this issue and fixed it??

 


73,

Bruce N1LN

 


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[Elecraft] Amplifiers

[Brian Heinitz]

With all of the anticipation about the KPA 1500, a timely and informative 
discussion of that product and amplifiers in general can be heard on episode 38 
of the Workbench podcast at Ham Radio 360.

David Shoaf KG6IRW from Elecraft is interviewed by Workbench podcast hosts (and 
Elecraft product owners) George KJ6VU and Jeremy KF7IJZ. This edition of the 
podcast does a great job of explaining the design philosophy of the KPA 1500 
(and KPA 500) and discusses considerations any ham should think about when 
planning on adding an amplifier to their shack. 

If you are not familiar, the Workbench podcast is one of three podcasts 
produced under the Ham Radio 360 umbrella. The Workbench is specifically 
focused on the hands-on DIY or “maker” side of our hobby and as such offers a 
deeper dive into some of the more technical aspects of the hobby. The other two 
podcasts focus on portable or field operations (great for KX3/KX2 users) and on 
the hobby in general. Elecraft is a sponsor of the podcast, and I highly 
recommend them to you.

Here’s the link to episode 38 on amplifiers with David Shoaf KG6IRW:

http://hamradio360.com/index.php/2017/12/05/ham-radio-workbench-37-hf-amplifiers-with-kg6irw/

Brian Heinitz
K1 / K2 and multiple mini modules
KI7LKB 
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[Elecraft] Fwd: [PVRC] Voice waveform asymmetry limits your loudness

[Jim Miller]

Nov/Dec 2017 QEX has a very nice article by W4ENE on how typical male voice
waveform asymmetries will cause peak-riding ALC to unnecessarily limit
average power even through compression and other technologies.

I myself had noticed that my voice on an oscilloscope or as seen in
Audacity, has these extreme asymmetries, even larger than the examples
given by W4ENE.

W3AM has a very nice web page on the subject too: http://www.w3am.com/
8poleapf.html

There he illustrates a simple op-amp all pass network that has substantial
phase shift across the male speech bandwidth to “break up” the asymmetry.

With links to the Kahn Symmetra-Peak, a broadcast radio unit that dates
back the 1960’s.

I’m gonna be building some hardware for myself soon!

Originally posted by Tim N3QE to PVRC list.

jim ab3cv
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Re: [Elecraft] FA-VA4

[Art via Elecraft]

After reading several posts here about this antenna analyzer kit, I decided to 
order one on Dec. 2. Got the confirmation immediately, but never received any 
shipping notice or the product. I have sent two inquires that have gone 
unanswered.


Has anyone had any experience with the company? Any suggestions?


73 and Merry Christmas,


Art KZ5D
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Re: [Elecraft] K3 / RF gain - S meter issue

[carlo bianconi]

Hi Bruce,

try to reload the factory data calibration before doing the calibration 
with a generator.


Usually it works.

73, Carlo

Carlo Bianconi Telecomunicazioni Official Elecraft Dealer Via O.Trebbi 8/B 
40127 Bologna - Italy Ph. 0515878825 mail carlobianc...@iol.it 
www.carlobianconi.com

Il 14/12/2017 14:38, Roger D Johnson ha scritto:
Is the S meter supposed to read 60 over 9 when the RF gain is turned 
all the way down?


Mine reads 30db!

73, Roger



On 12/13/2017 9:10 PM, Wes Stewart wrote:
I would first perform the RF Gain calibration using the K3 Utility. 
The calibration program measures gain characteristics and applies 
software correction.


Then run the S-meter calibration.

Wes  N7WS

On 12/13/2017 2:25 PM, Bruce Meier wrote:
Looking for suggestions here from someone that might have 
experienced this

same issue - -


I have (2) K3 units (not the S model) that are acting different when 
the RF

gain adjustments are turned fully counter clockwise.

Ø  Unit one – s/n 1062: When the RF gain is decreased to full counter
clockwise position the S-Meter registers full scale (60db over S9) as
expected.

Ø  Unit two – s/n 1193:  When the RF gain is decreased to full counter
clockwise position the S-Meter registers only S8.

  Facts:

Ø  With the exception of the S-Meter readings with RF gain settings, 
both

units are working fine

Ø  Both units have ‘almost’ all mods installed.  If not all, they 
are at

least both the same.

Ø  Both units are running the same version of microcode (5.54) 
(2.88) (2.88)

(1.26)

Ø  Both units seem to register very close actual RF gain of stations 
when

connected when tested on the same antenna

Ø  Both units have the new synthesizers.

Ø  Both units have second RX

Ø  In both cases (both units) I can hear the audio level decreasing 
linearly

as expected as the RF gain is turned counter clockwise

I have tried to initialize the K3 and reload the firmware resulting 
in no

change to the RF gain / S-Meter readings.


Elecraft Tech Support suggested:

Ø  Calibrating the s-meter – did nothing

Ø  Next suggestion – send the rig to California.


Anyone have this issue and fixed it??


73,

Bruce N1LN


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Re: [Elecraft] K3: 2 meter SSB/CW Capability Questions

[Jim Rogers]

Steve and others,

My best 2M MS contact was running the K144XV with the phase lock board 
and a BEKO amp at 800W into a 6el yagi in my attic. Over 1100 miles as I 
remember. It was a good combination.


Jim, W4ATK
On 12/14/2017 7:04 AM, Steve Kavanagh via Elecraft wrote:

Phil

One possible way to make a decision is to consider whether or not you might 
want to try meteor scatter on 2m using MSK144.  The recommended absolute 
frequency accuracy for that mode is 25 Hz (though I think you'd get away with 
80 Hz). This is a real challenge at 2m and the XV144 isn't really up to it, 
though I have managed a few MS QSOs using a K2/XV144/amp combo.

73,
Steve VE3SMA
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.



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Re: [Elecraft] K3 / RF gain - S meter issue

[Wes Stewart]

Both of mine do.

On 12/14/2017 6:38 AM, Roger D Johnson wrote:
Is the S meter supposed to read 60 over 9 when the RF gain is turned all the 
way down?


Mine reads 30db!

73, Roger



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[Elecraft] N1BYT Single Loop Receiver query

[John Gibson]

Many years ago I bought an N1BYT Single Loop Receiver at the Dayton Hamvention. 
The radio has 3 controls and came with a small single-loop wire antenna that 
plugs into an NE602AN balanced mixer. Other ICs include an Analog Devices 
AMP04F instrumentation amplifier, an LM386 audio amplifier, and an LP2951 
voltage regulator.

Because of work and family obligations, I set the radio aside and did not use 
it. Just recently, I found the radio, powered it up, and it works, but I could 
not find the instruction sheet, and I have forgotten the control functions and 
basic operating procedure.

If you have instructions for the N1BYT Single Loop Receiver, would you be kind 
to share them with me? Please reply off list.

73,

John Gibson, no8v
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Re: [Elecraft] K3 / RF gain - S meter issue

[Roger D Johnson]

Is the S meter supposed to read 60 over 9 when the RF gain is turned all the way 
down?


Mine reads 30db!

73, Roger



On 12/13/2017 9:10 PM, Wes Stewart wrote:
I would first perform the RF Gain calibration using the K3 Utility. The 
calibration program measures gain characteristics and applies software 
correction.


Then run the S-meter calibration.

Wes  N7WS

On 12/13/2017 2:25 PM, Bruce Meier wrote:

Looking for suggestions here from someone that might have experienced this
same issue - -


I have (2) K3 units (not the S model) that are acting different when the RF
gain adjustments are turned fully counter clockwise.

Ø  Unit one – s/n 1062: When the RF gain is decreased to full counter
clockwise position the S-Meter registers full scale (60db over S9) as
expected.

Ø  Unit two – s/n 1193:  When the RF gain is decreased to full counter
clockwise position the S-Meter registers only S8.

  Facts:

Ø  With the exception of the S-Meter readings with RF gain settings, both
units are working fine

Ø  Both units have ‘almost’ all mods installed.  If not all, they are at
least both the same.

Ø  Both units are running the same version of microcode (5.54) (2.88) (2.88)
(1.26)

Ø  Both units seem to register very close actual RF gain of stations when
connected when tested on the same antenna

Ø  Both units have the new synthesizers.

Ø  Both units have second RX

Ø  In both cases (both units) I can hear the audio level decreasing linearly
as expected as the RF gain is turned counter clockwise

I have tried to initialize the K3 and reload the firmware resulting in no
change to the RF gain / S-Meter readings.


Elecraft Tech Support suggested:

Ø  Calibrating the s-meter – did nothing

Ø  Next suggestion – send the rig to California.


Anyone have this issue and fixed it??


73,

Bruce N1LN


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Re: [Elecraft] K3: 2 meter SSB/CW Capability Questions

[John Stengrevics]

Phil,

I have had no problems working MSK144 on 2 meters as well as EME using the 
K144XV internal option with my K3S.

John
WA1EAZ

> On Dec 14, 2017, at 8:04 AM, Steve Kavanagh via Elecraft 
>  wrote:
> 
> Phil
> 
> One possible way to make a decision is to consider whether or not you might 
> want to try meteor scatter on 2m using MSK144.  The recommended absolute 
> frequency accuracy for that mode is 25 Hz (though I think you'd get away with 
> 80 Hz). This is a real challenge at 2m and the XV144 isn't really up to it, 
> though I have managed a few MS QSOs using a K2/XV144/amp combo.
> 
> 73,
> Steve VE3SMA
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Re: [Elecraft] K3: 2 meter SSB/CW Capability Questions

[Steve Kavanagh via Elecraft]

Phil

One possible way to make a decision is to consider whether or not you might 
want to try meteor scatter on 2m using MSK144.  The recommended absolute 
frequency accuracy for that mode is 25 Hz (though I think you'd get away with 
80 Hz). This is a real challenge at 2m and the XV144 isn't really up to it, 
though I have managed a few MS QSOs using a K2/XV144/amp combo.

73,
Steve VE3SMA
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