[Elecraft] VOX Sensitivity for K2

[Dauer, Edward]

Is there a procedure for reducing the VOX sensitivity in the K2?  I have found 
nothing in the Manual or in the Menu menu.  I am using a Heil Proset.  The VOX 
triggers when I let a pen drop on the desk . . .   I believe I am using the 
recommended SSB settings - SSB-A at 2 and SSB-C at 3-1.  Any advice?

Tnx,

Ted, KN1CBR
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[Elecraft] P3 watt reading

[Gary Smith]

Is there an established way to have the P3 
not read in PEP? I would like to use the 
P3's watt meter to tune my amp but the PEP 
mode is not good for that.

Thanks,

73,

Gary
KA1J
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Re: [Elecraft] Elecraft P3 signal intensity

[Cady, Fred]

Hi,

"Why doesn’t the P3 signal strength agree with the K3S’s S-meter?  You would 
think the S-meter on the K3S and the signal displayed on the P3 would be the 
same. There are several reasons why this might not be the case that have to do 
with your display choices.
1.When the K3S SMTR MD menu is AbS, the K3S S-meter shows the 
absolute signal at the antenna and does not change when the preamplifier or 
attenuator are engaged.  The signal at the antenna has an absolute power and 
thus isn’t, nor should it be, affected by the K3S signal processing 
preamplifier or attenuator.  If the K3S SMTR MD menu is nor, changing the 
preamplifier and attenuator will change the signal displayed on the K3S.  This 
shows you the affect of the preamplifier and attenuator.  Meanwhile, if the K3S 
and P3 serial ports are connected, the P3 knows the status of the preamplifier 
and attenuator and adjusts its display accordingly.  That is, the P3 always 
operates in absolute mode showing you the power at the K3S antenna.  So, when 
SMTR MD menu is nor changing the preamplifier and attenuator will affect the 
K3S S-meter but not the P3 display.
2.The signal level on the K3S and P3 depends on their respective 
effective bandwidths.  In the K3S the bandwidth is set by the pass band tuning 
control.  In the K3S the S-meter gives you a measure of the signal within the 
K3S bandwidth.  In the P3 the effective bandwidth is approximately the span 
divided by 450 (there are 450 pixels  displaying signals across the P3 
display).  In the P3 each pixel gives you a measure of the signal within the 
effective bandwidth of the pixel.  If the two bandwidths are different, the K3S 
and P3 signal displays will be different.
This will particularly be evident with wideband signals such as SSB.  Even when 
the P3 span is 200 kHz its effective bandwidth per pixel is 440 Hz and it does 
not contain the full signal that is seen on the K3S S-meter.
As an exercise, change to a relatively noisy band and change the width of the 
pass band tuning.  You should see less noise on the K3S display when the 
bandwidth is narrower.  While doing this you shouldn’t see any change in what 
the P3 is displaying.
The bottom line here is “Don’t worry overmuch about the signal strength 
readings.”  Each display serves a different purpose.  The K3S S-meter shows you 
the signal strength of the signal(s) within its passband and the P3 shows you 
the relative strengths of a number of signals shown in its span."

(excerpt  from "The Elecraft K3s and P3").

Cheers,
Fred KE7X

For all KE7X Elecraft books, see www.ke7x.com




From: elecraft-boun...@mailman.qth.net  on 
behalf of IK4EWX 
Sent: Saturday, August 18, 2018 1:00 AM
To: elecraft@mailman.qth.net
Subject: [Elecraft] Elecraft P3 signal intensity

I have understood that it is normal that P3 with his extremely narrow IF give
lower S-units that the K3/K3S, but is it possible to adjust the P3 to give
same S-meter readings than my K3S?
Is there any way to give coherent signals intensity both K3 and P3?
On My P3 I read S6 a CW signal that is S9 on my k3S with his if 500hz wide.



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Re: [Elecraft] KPA1500 - temp reading drops 10C when under power

[Paul Baldock]

I just checked mine on 40M and when on CW Temp is 
bouncing all over the place. Same into a dummy 
load as the antenna 300ft away. It also does it 
to a lesser extent on 80M and a little bounce on 17M and 10M.


I suspect its in the amp and not related to common mode RF in the coax.

Probably a cap in the right place would fix it.

- Paul


At 11:20 AM 8/18/2018, you wrote:
Some baluns offer good common mode current 
rejection while others offer virtually no common 
mode rejection.   {See DJ0IP site and 
discussion on baluns.}Â  Since the feed line 
from the balun runs down the tower to the point 
where the feedline runs underground, that 
segment of feedline is exposed to radiation from 
the antenna.  Certainly common mode current can 
be a very realistic occurrence in this case. 
..." it's some sort of new 
hyper-super-ultra-infina-deluxe type never 
before discovered on earth."   Nope,  it is 
just basic physics regarding the properties of 
RF induced currents.    Depending on band, a 
choking impedance of 300 to 5000 ohms may be 
needed to resolve the issue.   Since it was 
disclosed as power related, this supports the 
issues of common mode currents. Good luck in 
finding and correcting the matter. 73 Bob, K4TAX 
On 8/18/2018 12:20 PM, Jeff Blaine wrote: > Odds 
are not good there.  The antennas have a balun 
at the feedpoint, > are on a tower 500 feet from 
the shack and the hardline runs under > 
ground.  If there is common mode involved, it's 
some sort of new > 
hyper-super-ultra-infina-deluxe type never 
before discovered on earth. > > 73/jeff/ac0c > 
alpha-charlie-zero-charlie > www.ac0c.com > > On 
18-Aug-18 7:12 AM, Bob McGraw K4TAX wrote: >> 
I'd say a bit of common mode current on the feed 
line.    I see that >> from time to time with 
my KPA500 on certain bands/antennas. >> >> 
73 >> >> Bob, K4TAX >> >> >> On 8/17/2018 11:45 
PM, Jeff Blaine wrote: >>> While running the 
KPA1500 in the SARTG tonight, I noticed that 
the >>> temp reading drops about 10C when 
transmitting.  min fan speed 1. >>> >>> Seems 
to be related to power - at 1500W it's pretty 
close to 10C. At >>> lower powers, it's less of 
a difference.  I don't recall seeing that >>> 
before. >>> >>> Normal? >>> >>> 73/jeff/ac0c >>> 
alpha-charlie-zero-charlie >>> 
www.ac0c.com >>> >>> 
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Re: [Elecraft] KPA1500 - temp reading drops 10C when under power

[Bob McGraw K4TAX]

Some baluns offer good common mode current rejection while others offer 
virtually no common mode rejection.   {See DJ0IP site and discussion on 
baluns.}  Since the feed line from the balun runs down the tower to the 
point where the feedline runs underground, that segment of feedline is 
exposed to radiation from the antenna.  Certainly common mode current 
can be a very realistic occurrence in this case.


..." it's some sort of new hyper-super-ultra-infina-deluxe type 
never before discovered on earth."   Nope,  it is just basic physics 
regarding the properties of RF induced currents.    Depending on band, a 
choking impedance of 300 to 5000 ohms may be needed to resolve the 
issue.   Since it was disclosed as power related, this supports the 
issues of common mode currents.


Good luck in finding and correcting the matter.

73

Bob, K4TAX


On 8/18/2018 12:20 PM, Jeff Blaine wrote:
Odds are not good there.  The antennas have a balun at the feedpoint, 
are on a tower 500 feet from the shack and the hardline runs under 
ground.  If there is common mode involved, it's some sort of new 
hyper-super-ultra-infina-deluxe type never before discovered on earth.


73/jeff/ac0c
alpha-charlie-zero-charlie
www.ac0c.com

On 18-Aug-18 7:12 AM, Bob McGraw K4TAX wrote:
I'd say a bit of common mode current on the feed line.    I see that 
from time to time with my KPA500 on certain bands/antennas.


73

Bob, K4TAX


On 8/17/2018 11:45 PM, Jeff Blaine wrote:
While running the KPA1500 in the SARTG tonight, I noticed that the 
temp reading drops about 10C when transmitting.  min fan speed 1.


Seems to be related to power - at 1500W it's pretty close to 10C. At 
lower powers, it's less of a difference.  I don't recall seeing that 
before.


Normal?

73/jeff/ac0c
alpha-charlie-zero-charlie
www.ac0c.com

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Re: [Elecraft] KPA1500 - temp reading drops 10C when under power

[Jeff Blaine]

Odds are not good there.  The antennas have a balun at the feedpoint, 
are on a tower 500 feet from the shack and the hardline runs under 
ground.  If there is common mode involved, it's some sort of new 
hyper-super-ultra-infina-deluxe type never before discovered on earth.


73/jeff/ac0c
alpha-charlie-zero-charlie
www.ac0c.com

On 18-Aug-18 7:12 AM, Bob McGraw K4TAX wrote:
I'd say a bit of common mode current on the feed line.    I see that 
from time to time with my KPA500 on certain bands/antennas.


73

Bob, K4TAX


On 8/17/2018 11:45 PM, Jeff Blaine wrote:
While running the KPA1500 in the SARTG tonight, I noticed that the 
temp reading drops about 10C when transmitting.  min fan speed 1.


Seems to be related to power - at 1500W it's pretty close to 10C. At 
lower powers, it's less of a difference.  I don't recall seeing that 
before.


Normal?

73/jeff/ac0c
alpha-charlie-zero-charlie
www.ac0c.com

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Re: [Elecraft] K3 No power out

[Bob Wilson, N6TV]

From the "Troubleshooting" section of the K3 manual:

*No power output*: You may have routed RF through the KXV3’s XVTR IN/OUT
jacks, either by switching
to a transverter band, or by setting CONFIG:KXV3 to TEST. Also try redoing
TX GAIN cal (pg. 49).

73,
Bob, N6TV

On Tue, Aug 14, 2018 at 9:29 PM, Don Roberts via Elecraft <
elecraft@mailman.qth.net> wrote:

> Yes I can set it at 35 watts which is what I usually use to drive the KPA
> 500, and speak in the mic for ssb and get no power out. In cw at the same
> 35 watts, when I send code either straight key or padfle. 0 watts out. Same
> results if I attempt to run bearfoot at 100 watts or 5 watts, I get no
> power out. Receive is working fine, the P3 is working normal, and the KPA
> 500 and KAT 500 track bands as I change them.
> I will try again tomorrow after a night of sleep. If still no go, will
> phone home to Elecraft
> Don, W4CBS
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Re: [Elecraft] KPA-1500 changes modes

[Bob Wilson, N6TV]

Are you using the PC DATA connector to have the KPA1500 automatically
follow the frequency of your transceiver?  If so, try setting MENU:RADIO
POLL OFF; commands from the amp. could be interfering with radio commands
from WSJT-X/OmniRig.  You might also try a slower or faster baud rate in
both the radio and in OmniRig.

73,
Bob, N6TV

On Thu, Aug 16, 2018 at 10:10 AM, Richard Zalewski 
wrote:

> I have been experiencing an intermittent problem with the KPA-1500,
> TS-990.  When running WSJT-X (USB) occasionally the 990 goes to AM-D1
> mode.  No reason I can see for it to do that.  It does this in RECEIVE.
> Just to be sure however I put lots of ferrite on all leads involved.
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Re: [Elecraft] Bluetooth latency and CW reception

[Bob N3MNT]

I tried a few BT transmitters.  No issue with interference, but the latency
you are concerned about made it impossible to send at any speed.  Works fine
on SSB, but for me was not usable for CW and since most of my time is spent
on CW I stopped using it.  I know there have been a few members who claim to
have found one that is better.  Hopefully one of them will come in with a
model and some data.




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Re: [Elecraft] KPA1500 - temp reading drops 10C when under power

[Bob McGraw K4TAX]

I'd say a bit of common mode current on the feed line.    I see that 
from time to time with my KPA500 on certain bands/antennas.


73

Bob, K4TAX


On 8/17/2018 11:45 PM, Jeff Blaine wrote:
While running the KPA1500 in the SARTG tonight, I noticed that the 
temp reading drops about 10C when transmitting.  min fan speed 1.


Seems to be related to power - at 1500W it's pretty close to 10C. At 
lower powers, it's less of a difference.  I don't recall seeing that 
before.


Normal?

73/jeff/ac0c
alpha-charlie-zero-charlie
www.ac0c.com

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[Elecraft] Elecraft P3 signal intensity

[IK4EWX]

I have understood that it is normal that P3 with his extremely narrow IF give
lower S-units that the K3/K3S, but is it possible to adjust the P3 to give
same S-meter readings than my K3S?
Is there any way to give coherent signals intensity both K3 and P3?
On My P3 I read S6 a CW signal that is S9 on my k3S with his if 500hz wide. 



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