[Elecraft] K3 Fault 6 and loss of power control

[Pete Smith N4ZR]

Today I started seeing this in my K3 driving a KPA-1500.  It only needs 
around 30-34 watts to drive it to full power on CW, but when I set the 
K3's power to that, and everything looks fine, occasionally the K3 
displays Fault 6 on its panel and causes the KPA-1500 to fault, 
displaying 65 watts input on the amp's display and well over 1500 watts 
on the power bargraph.


I can't find any reference to Fault 6 in the manual for the K3 - can 
anyone clue me in?  Is something dying in the K3?


--
73, Pete N4ZR
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Re: [Elecraft] P3 + SVGA (and cables)

[Fred Jensen]

That's the connector where the K-POD connects in addition to whatever 
Elecraft techs use it for


73,

Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County

Robert Brown via Elecraft wrote on 3/6/2024 6:34 PM:

Excellent condition P3 w/SVA option.  Only “defect” is that a underbody 
connector (presumably only used by Elecraft techs) is detached.  Will provide 
original part if replacement is desired, but seems to serve no useful purpose.  
Unit is otherwise in pristine operational and cosmetic condition. Will include 
cables for both K3 and K3s rigs. $775/shipped/insured CONUS.  Bob Brown, N1CVX 
(sashan...@yahoo.com)
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[Elecraft] P3 + SVGA (and cables)

[Robert Brown via Elecraft]

Excellent condition P3 w/SVA option.  Only “defect” is that a underbody 
connector (presumably only used by Elecraft techs) is detached.  Will provide 
original part if replacement is desired, but seems to serve no useful purpose.  
Unit is otherwise in pristine operational and cosmetic condition. Will include 
cables for both K3 and K3s rigs. $775/shipped/insured CONUS.  Bob Brown, N1CVX 
(sashan...@yahoo.com)
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Re: [Elecraft] K3/100 TX problem on 20m

[Michael Carter via Elecraft]

Hi Paul,

For comparison, here are the 50 watt TX gain values from the
calibration I did last November when I installed
the KPA3A 100 watt PA in my K3 (s/n 67xx):

1900 kHz TXGain HP  10
3750 kHz TXGain HP  06
5336 kHz TXGain HP  08
7150 kHz TXGain HP  08
10125 kHz TXGain HP  08
14200 kHz TXGain HP  05
18110 kHz TXGain HP  05
21200 kHz TXGain HP  03
24930 kHz TXGain HP  03
29000 kHz TXGain HP  05
52000 kHz TXGain HP  04

Do you know if your 100 watt PA module
uses RF bipolar transistors or MOSFETs
(the KPA3A uses MOSFETs; the original KPA3
uses bipolars)?
I don't know if the MOSFET version has higher gain
than the bipolars, but I suspect not.

I've been in a separate conversation
with Hal, W7YNC, who is an LDMOS RF amplifier
designer professionally.  There is some
uncertainty about whether the higher TX gain
parameters mean higher TX drive signal
amplitude or the converse.

In any event, your TX gain values don't
have wild swings from band to band,
although the difference between 20
meter and 30 meter gains is substantial.

Perhaps some others who have done
TX gain calibrations recently (or could
repeat them) on K3 units with the
bipolar PA transistors could post
their results?

73,
Mike, K8CN

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[Elecraft] K3/100 TX problem on 20m

[Paul Kent]

Sent from Mail for Windows
Thanks, Mike.

The 50w TX gain numbers are: 160m/32, 80m/36, 60m/48, 40m/40, 30m/32, 20m/18, 
17m/11, 15m/08, 12m/05, 10m/05, 6m/02

Paul, K0PK
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[Elecraft] Tip: Front Panel Illumination Tip

[Rick Tavan]

Radio front panels are busy - lots of knobs and buttons with small labels
that seem to shrink as we age. Some of the colors are low-contrast. If room
lighting isn't right, they're unreadable, even invisible. Here is a small,
LED, clip-on lamp that solved the problem for me:

https://www.amazon.com/dp/B08RNQVZMD?ref=ppx_yo2ov_dt_b_product_details=1

It's surprisingly inexpensive, has controllable color and brightness, a
stiff gooseneck (nicely stable), and a very strong clamp. I've clipped it
to the low shelf on which my rigs sit and positioned the light to
illuminate front panels without glare into my eyes. It runs on USB power
(not supplied) and works a treat!

73,

/Rick N6XI

--

Rick Tavan
Truckee and Saratoga, CA
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Re: [Elecraft] KH1 -

[Dave New, N8SBE]

You already answered your own question.  Note that the entry says "GET 
only", which means you can read the limits, but cannot set them.


I doubt that Elecraft will publicly release a firmware that would allow 
anyone to fiddle with the transmit limits on their own, since that could 
lead to folks just 'opening up' the radio and transmitting out of band, 
either by accident, or on purpose.


Please contact supp...@elecraft.com, and see if they have a KH1 firmware 
download for you with Thailand transmit limits set in it already.  I 
know they support MARS station requests with firmware for some of their 
other rigs.


73,
-- Dave, N8SBE

On 2024-03-06 01:27, JCG wrote:
The KH1 seems to fulfil my need of a 40 to 15M CW QRP rig with SSB and 
AM reception capability. I'm currently studying the manuals issued by 
Elecraft and have a first question: did an OM or YL use the KH1 
Programmer's Reference to precisely set the KH1 to his needs, using for 
exemple a Putty terminal emulator? I plan to use it in Thailand and I 
need to precisely set band edges (7.0 to 7.2 - 10.1 to 10.15 - 14.0 to 
14.35 - 18.068 to 18.168 and 21.0 to 21.45) outside of which TX must be 
blocked. According to the Programmer's Reference manual (page 6 - 
TXL/TXH (Transmit Limits; GET only) FORMAT: TXLn; or TXHn; where “L” 
returns lower limit, “H” returns upper limit,
and  is 0..4 for 40..15 meters. Reponse: TXLnF; where F is 
limit in kHz.) this seems to be possible. Did a member already use this 
remote setting procedure?

73 - Pierre - FK8IH
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