Re: [Elecraft] Fair-Rite 4" Toroids

[Jim Brown]

On 7/27/2022 1:18 PM, jerry wrote:

Will the 2.4 inchers handle legal limit?


If used per the Cookbook, yes.

73, Jim K9YC

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Re: [Elecraft] Fair-Rite 4" Toroids

[jerry]

Will the 2.4 inchers handle legal limit?

  - Jerry KF6VB

On 2022-07-27 13:00, Jim Brown wrote:

On 7/27/2022 12:24 PM, Howard Hoyt via Elecraft wrote:
We have been answering queries about the large 4" OD Fair-Rite 
2631814002 toroids  
which have been out of stock for a while but we now have good stock.


It should be noted that my extensive work showed the effectiveness of
these oversized cores to be limited to 20M and below, and the
standard-size (and much less expensive) 2.4-in o.d. cores to be the
superior choice above 80M. W6GJB and I have used them only on 160M.

http://k9yc.com/2018Cookbook.pdf

73, Jim K9YC
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[Elecraft] Wanted older k3 kSYN3 boards

[Larry Shapiro]

Hell all,
I have a customer looking for 2 older K3 KSYN3 boards.
In the past I have purchased a bunch of them,but they have all been used.
Please let me know what you have..off list.
Thank you,
Larry K6ro 

www.LSRarecoins.com
310-710-2869

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Re: [Elecraft] Fair-Rite 4" Toroids

[Jim Brown]

On 7/27/2022 12:24 PM, Howard Hoyt via Elecraft wrote:
We have been answering queries about the large 4" OD Fair-Rite 
2631814002 toroids  
which have been out of stock for a while but we now have good stock.


It should be noted that my extensive work showed the effectiveness of 
these oversized cores to be limited to 20M and below, and the 
standard-size (and much less expensive) 2.4-in o.d. cores to be the 
superior choice above 80M. W6GJB and I have used them only on 160M.


http://k9yc.com/2018Cookbook.pdf

73, Jim K9YC
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Re: [Elecraft] KX3 Internal Batteries

[Doug Plunkett]

Thanks! I really do appreciate the advice!

Doug
KE0GOM 

Sent from my iPad

> On Jul 27, 2022, at 7:14 AM, Rich WC3T  wrote:
> 
> I took them out just as a prophylactic measure.  I *think* I know that Ni-Cd 
> cells don’t burst/leak over time but I would rather not perform that 
> experiment with a KX3.  
> 
> My Bioenno battery is a small price (in $ and peace of mind) to ensure that I 
> don’t destroy my radio.   :)
> 
> 72,
> Rich Hurd / WC3T / DMR: 3142737  
> Grid: FN20is
> Bureaucracy is always in search of self-preservation.  — AA7BQ
> 
>> On Jul 26, 2022, at 22:18, Gwen Patton  wrote:
>> 
>> I stopped keeping batteries (NiMH) in the internal tray when the rig got
>> stuck in an error state while trying to update the firmware. The fix for
>> the issue was to remove all power to the radio for a short time, maybe half
>> a minute, then restore power and update the firmware again. Trouble is, if
>> you have batteries in the internal tray, it can't drop all power unless you
>> open the radio and remove the batteries. After I did that, I simply did not
>> return the batteries to the radio. They are now happily in use powering a
>> Roland MIDI Wind Controller. If I need to power the KX3 in the field, or
>> during a power outage, I will use an external battery pack.
>> 
>> If it disables the RTC, I hadn't noticed the lack. So at least for me it
>> wasn't an issue.
>> 
>> -=-=-=-=-=-=-=-=-
>> 73,
>> Gwen, NG3P
>> 
>> 
>>> On Tue, Jul 26, 2022 at 8:15 PM Walter Underwood 
>>> wrote:
>>> 
>>> I have Eneloop Pro batteries in mine. I replaced them (originally called
>>> Eneloop XX) after seven years. A bit after that, one had a small leak. So
>>> mine are now on a five year replacement schedule.
>>> 
>>> wunder
>>> K6WRU
>>> Walter Underwood
>>> https://observer.wunderwood.org/  (my blog)
>>> 
 On Jul 26, 2022, at 5:10 PM, Jim Brown 
>>> wrote:
 
> On 7/26/2022 4:56 PM, Doug Plunkett wrote:
>> to avoid the rare instance of a battery leaking onto the circuitry.
> 
> Several years ago, I switched away from lead-acid batteries in most of
>>> equipment that uses AA and AAA cells in favor of NiMH rechargeables, after
>>> reading that they are far less likely to leak. So far, no leaks.
 
 From the beginning, at least five years ago, the batteries in my KX3
>>> have been high-capacity NiMH that I bought at Pacificon.
 
 73, Jim K9YC
 
 
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[Elecraft] Fair-Rite 4" Toroids

[Howard Hoyt via Elecraft]

Hi all,

We have been answering queries about the large 4" OD Fair-Rite 
2631814002 toroids  
which have been out of stock for a while but we now have good stock.  
Thanks for your patience!


Cheers & 73,
Howie / WA4PSC
proaudioeng.com
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Re: [Elecraft] KPA-500 timing settings IC-7300

[Lyn Norstad]

Tom -

I am running the 7300 with KPA/KAT500 and have the TX Delay on the 7300 set for 
15ms on both HF and 50MHz (the range is 0 - 30ms), and the CW Rise Time set to 
the default, 4ms (range 2ms - 8ms).

On the KPA500, I have TR set to 00.

Hope that helps.

73
Lyn, WØLEN

-Original Message-
From: elecraft-boun...@mailman.qth.net 
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Tom N4LSJ
Sent: Tuesday, July 26, 2022 8:39 PM
To: Elecraft@mailman.qth.net
Subject: [Elecraft] KPA-500 timing settings IC-7300

I've been on the internet and can find IC-7300 TX Delay, CW Rise Time 
settings for other amplifiers pretty easily.  There don't appear to be 
any for -specifically- the IC-7300 and KPA-500.  Are there "officially 
sanctioned" settings for that combination?  I feel it may be overkill to 
use 30ms when 10ms TX delay may suffice.  Is there also a suggested CW 
rise time from Elecraft?

The KPA-500 also has a "TR TIME" settings from 0 to 50 as well. Does 
that need to be set for the 7300?

I -DO- have a KAT-500 and the whole get-up is hooked as per the 
documentation on Elecraft's FTP site, e.g. the key line going to the 
tuner, then the amp.  That document says nothing regarding timing.

73 to all!

Tom N4LSJ.



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[Elecraft] KX3 mic bias

[Douglas Speer]

I am getting no audio into my KX3 from a MH3 hand mic. All connections and 
components in the MH3 check good to the best of my ability. I’m measuring about 
1.7vdc mic bias. Seems low to me but I can’t find a spec anywhere. Does anyone 
know what the mic bias from the KX3 should be?

Doug, W5WTX
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Re: [Elecraft] KPA-500 timing settings IC-7300

[Brian D]

t5he ic7300 does have an RF tail, which has recently been discussed in the
ic7300 group on groups.io

extract from there:


Hello Adam,

As you requested, I have updated the page with the new 'scope trace.
http://wb6bbb.com/Icom_IC-7300/index.html

The entire web page, including thumbnail and full-size images, is available
in this 52.1 MB zip file:
http://wb6bbb.com/Icom_IC-7300/Icom%20IC-7300%20Hot-switch%20Mitigation.zip

Thank you for your support.

Best regards,
Larry
WB6BBB


PS: I've attached a PDF file of the main page (without the Disclaimer page),
but unlike Adam's PDF, the images do not link to the web page when clicked.




Jack Brindle via Elecraft  wrote:

> The TRTime parameter sets the time the KPA takes to transition from TX to
> RX - this is specifically for transmitters that may continue to output RF
> for a short time after their PTT line becomes inactive. For the K3, K3S
> and K4 that time is very short, which means the KPA can transition
> immediately from RX to TX (it takes less than 1 mSec). There are some
> transceivers that start the key up process when the PTT line becomes
> inactive. I don’t know what the 7300 does in this case - hopefully others
> on the list have this information and can tell us.
> 


-- 
Brian D 
G3VGZ G8AOE G3T
IO94im
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Re: [Elecraft] KX3 Internal Batteries

[Rich WC3T]

I took them out just as a prophylactic measure.  I *think* I know that Ni-Cd 
cells don’t burst/leak over time but I would rather not perform that experiment 
with a KX3.  

My Bioenno battery is a small price (in $ and peace of mind) to ensure that I 
don’t destroy my radio.   :)

72,
Rich Hurd / WC3T / DMR: 3142737  
Grid: FN20is
Bureaucracy is always in search of self-preservation.  — AA7BQ

> On Jul 26, 2022, at 22:18, Gwen Patton  wrote:
> 
> I stopped keeping batteries (NiMH) in the internal tray when the rig got
> stuck in an error state while trying to update the firmware. The fix for
> the issue was to remove all power to the radio for a short time, maybe half
> a minute, then restore power and update the firmware again. Trouble is, if
> you have batteries in the internal tray, it can't drop all power unless you
> open the radio and remove the batteries. After I did that, I simply did not
> return the batteries to the radio. They are now happily in use powering a
> Roland MIDI Wind Controller. If I need to power the KX3 in the field, or
> during a power outage, I will use an external battery pack.
> 
> If it disables the RTC, I hadn't noticed the lack. So at least for me it
> wasn't an issue.
> 
> -=-=-=-=-=-=-=-=-
> 73,
> Gwen, NG3P
> 
> 
>> On Tue, Jul 26, 2022 at 8:15 PM Walter Underwood 
>> wrote:
>> 
>> I have Eneloop Pro batteries in mine. I replaced them (originally called
>> Eneloop XX) after seven years. A bit after that, one had a small leak. So
>> mine are now on a five year replacement schedule.
>> 
>> wunder
>> K6WRU
>> Walter Underwood
>> https://observer.wunderwood.org/  (my blog)
>> 
>>> On Jul 26, 2022, at 5:10 PM, Jim Brown 
>> wrote:
>>> 
>>> On 7/26/2022 4:56 PM, Doug Plunkett wrote:
 to avoid the rare instance of a battery leaking onto the circuitry.
>>> 
>>> Several years ago, I switched away from lead-acid batteries in most of
>> equipment that uses AA and AAA cells in favor of NiMH rechargeables, after
>> reading that they are far less likely to leak. So far, no leaks.
>>> 
>>> From the beginning, at least five years ago, the batteries in my KX3
>> have been high-capacity NiMH that I bought at Pacificon.
>>> 
>>> 73, Jim K9YC
>>> 
>>> 
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>> 
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