Re: [Elecraft] Solar Cycle

[Vic Rosenthal]

375! And today I'm happy when it breaks 100.

Vic 4X6GP

> On 23 Jul 2016, at 04:22, Bill W4ZV  wrote:
> 
> Guy Olinger K2AV wrote
>> I remember 1956 - 1958. Conditions have never been that way since. We are
>> in the trough of a very long term solar super-cycle that had a peak in
>> 1956.
> 
> The peak was actually late December 1957 (Solar Flux = 375 and sunspots =
> 355).  
> 
> http://www.solen.info/solar/history/hist1957.html
> 
> I was very lucky to be QRV then and made the first Novice DXCC:
> 
> http://www.novice.bappy.com/about_21.html
> 
> 73,  Bill  W4ZV
> 
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Re: [Elecraft] 20 meters is dead all day

[Edward R Cole]

I'll take a chance the thread has not been moderated.

I built my first receiver in time for listening on 1958 to wide-open 
10m.  Guy's running 50w easily heard around the world.  Definitely 
never the same since.  Unfortunately 13wpm kept my off 10m though I 
passed the General written exam when I took my Tech license in 1959 
at age 15.  The good part of that was I got on 6m and 2m which led to 
years on VHF+.  I now can work the world by sending my signal half a 
million miles via the Moon; no propagation issues (unless a solar 
flare disturbs the ionosphere enough to attenuate my signal passage thru it).


Nearly impossible to check into the Elecraft SSB Net on Sunday's; 
only hear N6JW and that can be rough copy.  20m is mostly noise these 
days.  WWV comes thru on 15-MHz and very little heard on 
17-10m.  Ground wave on 600m is still reliable and some DX during 
winter when folks south of me can hear weak signals (static crashes 
kill 600m in summer).


Hoping Joe Tayor (K1JT) will have out a digital QSO based mode 
soon.  That should help use on HF/MW.


73, Ed - KL7UW
http://www.kl7uw.com
"Kits made by KL7UW"
Dubus Mag business:
dubus...@gmail.com

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[Elecraft] K3 For Sale!

[pastormg2]

Good Evening this is Mark Griffin, KB3Z. I would like to put my K3 up for sale. 
Please see below for all the details.

Mark Griffin, KB3Z

 
 

Elecraft K3 System 
 


 
 

Part # Description Selling Price
K3-100 F K3 100 Watt Transceiver, SN# 4805 1650
KXV3A RX Ant, IF Out, Xverter Int. 82.5
KSYN3AUPG Ksyn3a Upgrade Kit 165
KVDR3 K3 Digital Voice Recorder 105
KFL3A-1.8K-IR 1.8 KHZ 8 Pole Filter 82.5
KFL3A-250-IR 250 Hz 8 Pole Filter 105
KFL3A-400-IR 400 Hz 8 Pole Filter 105

 
 

Total 
 2295

 
 


 
 


 
 


 
 


 
 

K3 has the 2.8 KHZ 8 pole filter that came with the radio. 

K3 does not have Internal Antenna Tuner. 

K3 does not have a Secondary Receiver. 

K3 Internal Speaker does not work due to a possible Resistor Fault.
My Email Address is pastor...@verizon.net

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Re: [Elecraft] Solar Cycle

[Bill W4ZV]

Guy Olinger K2AV wrote
> I remember 1956 - 1958. Conditions have never been that way since. We are
> in the trough of a very long term solar super-cycle that had a peak in
> 1956.

The peak was actually late December 1957 (Solar Flux = 375 and sunspots =
355).  

http://www.solen.info/solar/history/hist1957.html

I was very lucky to be QRV then and made the first Novice DXCC:

http://www.novice.bappy.com/about_21.html

73,  Bill  W4ZV






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[Elecraft] K2 for sale

[KC6CNN]

I am down sizing my shack to move to a small off grid cabin. 
I have a Elecraft K2 station for sale.
Station works great. 
Elecraft K2 Twins Price List.
EC2 K2 Blank Project Enclosure $79.95 
ETS15 Tilt Stand, 1.5 inch $14.95  
FDIMP Finger Dimple for K1/K2 $6.95 
K160RX K2 160M / 2nd RX Antenna Option $39.95  
K2 K2 HF Transceiver $759.95 
KAF2 K2 Audio filter and Real Time Clock $89.95 
KAT100-2 100W ATU with EC2 panels $229.95 
KAT100PNL Kit to convert KAT100-1 to -2 $39.95  
KAT2 K2 20W Internal Auto Tuner $179.95 
KBT2 K2 Internal 2.9AH Battery Kit $79.95  
KIO2 K2 AUX I/O RS-232 Interface $99.95  
KPA100 K2/100 Internal Integration Kit $399.95 
KSB2 K2 SSB Option $129.95 
Hand Microphone $40.00
10th Led CWT indicator $45.00
Fixed Auto Output  $35.00
Tuned by W3FPR 
 Total to purchase - $2271.35
For Sale for $1150
Thanks you
Gerald Manthey – KC6CNN
kc6...@gmail.com




-
KC6CNN - Gerald
K1 # 0014
K2 # 5486
K3 # 6294
KX3 # 757
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[Elecraft] K1 four band for sale.

[KC6CNN]

Elecraft K1 for Sale
Radio works great. I am down sizing my shack getting ready to move to a
small off grid cabin. 
I am selling this radio for $450. The radio includes the following options
and features:
K1-4 four band 5 watt CW Xcvr 15 / 20 / 30 / 40 
KFL1-2 two band module 20 / 40 meter additional 
KFL1-2 two band module 15 / 30 meter additional 
KAT1 Internal ATU for the K1
KNB1 Noise Blanker
K1BKLKIT K1 Back light kit
K1 Wide Range Tilt Stand

Thank you
Gerald Manthey – KC6CNN
kc6...@gmail.com






-
KC6CNN - Gerald
K1 # 0014
K2 # 5486
K3 # 6294
KX3 # 757
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[Elecraft] Solar Cycle

[Dauer, Edward]

“> I don't think conditions have been anywhere close to that since ”

That is my experience as well; and I believe the recorded sunspot counts since 
bear that out.  The Fall of 1957 on 15 meters was like shooting fish in a 
barrel, with a DX-20 then, after getting the bigger ticket, a Viking Ranger, an 
HQ-100, and a dipole almost but not quite 15 feet above ground.  The receive 
selectivity was something like the width of a garage door; but a routine 
morning was adding a handful of new entities in Europe and Africa before 
heading off to school, and a couple in the Pacific after coming home.  We all 
got spoiled.  But easier doesn’t necessarily mean more fun.

Ted, KN1CBR


--

Message: 14
Date: Fri, 22 Jul 2016 14:17:36 -0400
From: Guy Olinger K2AV 
To: Grant Youngman 
Cc: "elecraft@mailman.qth.net" 
Subject: Re: [Elecraft] Solar Cycle
Message-ID:

Content-Type: text/plain; charset=UTF-8

I remember 1956 - 1958. Conditions have never been that way since. We are
in the trough of a very long term solar super-cycle that had a peak in
1956.

In '56 every day in Columbus OH I could see test patterns on channel 2 from
Miami FL. Oh, to have had a K3/KPA500 back then.

11 meters was a ham band on my friend's dad's 75A3. And 10 was jumping.

73, Guy K2AV

On Friday, July 22, 2016, Grant Youngman  wrote:

> Or even DX on 15 at 2-3 o'clock in the morning.  My little DX-40 worked a
> lot of DX in those days -- phone and CW -- and it rarely mattered what time
> of day it was.
>
> I don't think conditions have been anywhere close to that since 
>
> Grant NQ5T
>


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Re: [Elecraft] K3S K3EXREF 10MHz Voltage Help

[Edward R Cole]

Bret,

I run my 10-MHz reference thru a 4-way distribution amplifier that 
has a two-pole bandpass filter which passes only a sine wave no 
matter how distorted the source 10-MHz.  That provides 10mw level to 
all my equipment needing a reference.


But if you are determined to provide some protection a 3-dB sma 
attenuator should do just fine.  They are small in diameter and size 
with typically sma-male and sma-female on opposite ends.


If there are some VHF-up hams in your area ask about getting one; 
otherwise they are available on e-bay and from mfr's (Google "sma 
attenuators").


73, Ed - KL7UW
http://www.kl7uw.com
"Kits made by KL7UW"
Dubus Mag business:
dubus...@gmail.com

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[Elecraft] Reply to Jim

[Dick]

Hi Jim, the panels are approximately 250 feet from my Hexbeam antenna and about 
275 feet from my Dipole (160-2m OCF).  I have not seen any rise in the noise 
level (base) on my S meter on my 857 . I am in a small town (10, 500), in 
central MA, my nearest neighbor is 200 feet from the antennas.

Dick


Sent from Mail for Windows 10

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[Elecraft] [PX3] RTFM - Was: Adafruit P/N 1737 Wireless Keyboard

[Joel Black]

Well, as I stated, I bought the keyboard and it arrived. I find it perplexing 
that I cannot use the F-keys for macros but I *can* use CTRL, F-key. I need to 
do some more reading. Works okay for what it is and why I bought it - macros 
for the PX3. This brings me to RTFM:

It really helps. I figured out I could program macros on the PX3 itself with 
its function keys. I only really wanted four to six macros which is all I had 
on the K3. Well, you can do that. I use FN1 - FN4 for BW control on the PX3. I 
figured out about the PX3 macros today and programmed FN5 and FN6 for what I 
was using PF1 for on the KX3.

Just thought you’d find a little humor in my continuing saga of cockpit errors. 
:) At least it wasn’t an expensive mistake and if I need more than six macros, 
I have the keyboard.

73,
Joel - W4JBB

> On Jul 21, 2016, at 12:10, Joel Black  wrote:
> 
> The Adafruit 1737 wireless keyboard I ordered showed up today. Appears to 
> work fine with the PX3 in case anyone’s interested.
> 
> I would consider the price a little high with shipping - $17 for the keyboard 
> and more than $12 for shipping. The keyboard is not very robust but I don’t  
> plan on standing on it. :)
> 
> All I’ve tried so far is Ctrl-Alt-M to see if it would communicate. It 
> communicates fine. I will try adding macros in the next day or two but I 
> don’t think there will be any issue.
> 
> 73,
> Joel - W4JBB

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Re: [Elecraft] 20 meters is dead all day

[James Bennett]

The band only “seems” dead. If you were to install WSJT-X and run a WSPR-2 
session you would see that there IS propagation - it is just a lack of stations 
where you are listening for and/or looking for CW/SSB activity. 

I currently have my KX3 running WSPR-2 via a Raspberry Pi 3. On 20 meters, with 
my simple wire doublet, I am decoding quite a variety of stations as far east 
as Indiana & Louisiana, at mid-day, and none of them are running more than five 
watts.

Granted, WSPR-2 is weak signal software, but stations with QRO power and 
rotatable antennas ought to be able to hear each other and make QSOs - IF 
someone gets on and actually calls CQ instead of simply listening, hearing 
nothing, and walking away thinking the band is dead…

Just my two rubles…..

73, Jim / W6JHB
Folsom, CA
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[Elecraft] Nova link on u-tube

[Art Nienhouse]

https://www.youtube.com/watch?v=ncphh8FWUUE

*/Regards
Art
ka9zap
/*
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Re: [Elecraft] 20 meters is dead all day

[Phil Wheeler]

Sid, re "I call it "Mouse-click Radio" as that's 
all you have to do. At least you will hear (see?) 
activity.": Seems like the other challenge might 
be staying awake for the complete contact, on 
these warm Summer afternoons ;-)


73, Phil W7OX

On 7/22/16 10:24 AM, Sid Frissell wrote:

You "20 meters is dead all day" guys need to check out WSJT-X (JT-9 and JT-65).
At least here in MT 14076 is busy every day all day!  You can find many US and 
VE stations plus a very good mix of DX. I have only been on this mode since 
late in 2014  (been a ham since 1950) and I have worked over 100 DX entities.  
{I started over when I took up digital.  New ones are still popping up.  Plenty 
of QSO's.  No rag-chewing of course !!!  Also, my DX spotter in DXLabd seems to 
keep rolling out spots all day--many on 20, both SSB and cw.  Try 14076.
I call it "Mouse-click Radio" as thats all you have to do. At least you will 
hear (see?) activity.

73, Sid.  NZ7M

Sent From Sid Frissell's iPad


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Re: [Elecraft] 20 meters is dead all day

[Jessie Oberreuter]

 At the Pacific Northwest QRP gathering a few weeks back, one of the 
presenters ran WSPRnet overnight on his K3.  I was amazed at the 
propagation!  Indeed, he used the live data in his presentation, and I was 
flabberghasted to see that a huge 6m opening had occured an hour ealier. 
I'm not particularly excited by point-and-click QSOs, but I am interested 
in using the same tools to generate opening alerts.


 Meanwhile, I had the 20m static on softly during my late night (12a - 
1a PDT) piano practices this week, and I heard a surprising amount of cw 
-- a nice reminder that 20m isn't just a night time band during Field Day 
:).


- kb7psg


On Fri, 22 Jul 2016, Sid Frissell wrote:

You "20 meters is dead all day" guys need to check out WSJT-X (JT-9 and 
JT-65). At least here in MT 14076 is busy every day all day!  You can 
find many US and VE stations plus a very good mix of DX. I have only 
been on this mode since late in 2014 (been a ham since 1950) and I have 
worked over 100 DX entities.  {I started over when I took up digital. 
New ones are still popping up.  Plenty of QSO's.  No rag-chewing of 
course !!!  Also, my DX spotter in DXLabd seems to keep rolling out 
spots all day--many on 20, both SSB and cw.  Try 14076. I call it 
"Mouse-click Radio" as thats all you have to do. At least you will hear 
(see?) activity.


73, Sid.  NZ7M

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Re: [Elecraft] Solar Cycle

[John K7JLT]

Yesterday I couldn't see any activity on 20 Meters but worked Pactor 3 at the 
maximum speed over a 1200 mile path.  Far from a dead band.

John K7JLT
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Re: [Elecraft] K3 - communication failure after KIO3B upgrade

[Carl Clawson]

Steve AD7OG graciously permitted me to tear his K3 apart and swap boards.
KIO3B main board is bad and Elecraft is sending a replacement.

73 - WS7L, whose K3 #486 after 8 years of service just keeps getting better!

On Tuesday, July 19, 2016, Carl Clawson  wrote:

> I've been in conversation with tech support but we have not yet found
> what's wrong.
> -- Carl
>
> On Tue, Jul 19, 2016 at 2:53 AM, Barry Simpson  > wrote:
>
>> Hi Carl
>>
>> Did you get the KIO3B problem resolved ?
>>
>> Barry  VK2BJ
>>
>>
>> -- Forwarded message --
>> From: Barry Simpson > >
>> Date: 17 July 2016 at 13:03
>> Subject: Re: [Elecraft] K3 - communication failure after KIO3B upgrade
>> To: Carl Clawson > >
>> Cc: Lyle Johnson > >, elecraft <
>> elecraft@mailman.qth.net
>> >
>>
>>
>> Hi Carl
>>
>> Have you actually set RS232 to USB in the Config menu ?  Just a thought.
>>
>> Barry  VK2BJ
>>
>> On 17 July 2016 at 11:47, Carl Clawson > > wrote:
>>
>>> Thanks Lyle. I tried those things. If it's a cable problem then I must
>>> have
>>> TWO defective cables, because feeding RS232 to the P3 and connecting the
>>> single-headed cable to the K3 also results in no communications to the
>>> K3.
>>> And yes, I put the K3 in RS232 mode at 38400 baud when I tried that.
>>>
>>> -- Carl
>>>
>>> On Sat, Jul 16, 2016 at 5:52 PM, Lyle Johnson >> > wrote:
>>>
>>> > Carl,
>>> >
>>> > A couple of thoughts.
>>> >
>>> > 1) Losing communications with the Y cable plugged into the KIO3B but
>>> not
>>> > having BOTH DE-9 connectors attached to the P3 will result in no
>>> > communications.  The KIO3B senses the Y cable and routes the USB side
>>> > communications to the P3 which then routes signals to the K3.
>>> >
>>> > 2) Be sure the cable is fully seated into the jack on the KIO3B. The
>>> > plastic lock should "click" into place.  You can verify this with a
>>> gentle
>>> > tug on the cable after it is inserted to verify it is fully seated.
>>> >
>>> > 3) Be sure the P3 is set to 38,400 bps on its serial ports.
>>> >
>>> > 4) If the cable is fully seated and the P3 is set to 38,400 bps and you
>>> > still have the problem, I'd suspect the Y cable being defective.  I
>>> don;t
>>> > know if the schematics for the cable are on the website or supplied
>>> with
>>> > the cable to assist you in troubleshooting the cable if you so desire,
>>> so
>>> > it may require a call to support on Monday, or an email directly to
>>> them.
>>> >
>>> > 73,
>>> >
>>> > Lyle KK7P
>>> >
>>> >
>>> > Maybe the combined wisdom of the group will be able to help before I
>>> send
>>> >> this to Elecraft support.
>>> >>
>>> >> I installed the KIO3B upgrade in my K3. The USB interface from PC to
>>> K3
>>> >> works but only if you don't plug a cable in the RS232/P3 jack. The
>>> RS232
>>> >> connection to the P3 isn't happening...
>>> >>
>>> > __
>>> > Elecraft mailing list
>>> > Home: http://mailman.qth.net/mailman/listinfo/elecraft
>>> > Help: http://mailman.qth.net/mmfaq.htm
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>>> 
>>> >
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>>> > Message delivered to clawso...@gmail.com
>>> 
>>> >
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>>>
>>
>>
>>
>
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Re: [Elecraft] Solar Cycle

[Wes Stewart]

At our monthly Southern Arizona DX Association club meeting last night, as we 
often do, we go around the room to hear what guys have worked since the last 
meeting. Personally, because it's thunderstorm season, I've been disconnected 
most of the month.  Others have not.


One guy, a top of the Honor Roll type, reported working 400 band/countries on HF 
and 47 states on 6-meters.  Another top of the Honor Roll guy, now a 6 and 
160 specialist worked 18 Europeans on 6 this past week.  And that's not from 
Maine, it's from southern Arizona.


The bands aren't great, but they are far from dead.


On 7/21/2016 9:22 PM, tomb18 wrote:

Just open a panadapter on 20m during the day...depressing. makes you wonder if 
it's working


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Re: [Elecraft] Solar Cycle

[Wes Stewart]

I was licensed as a Novice in 1958 and upgraded to Conditional shortly after.  
My Elmer, W7UVR, who signed both applications told me he didn't want the RI 
coming around and retesting me and having me fail, hence getting him in 
trouble.  So he said I better stay on CW for the duration.  I had my BC342 and a 
Millen transmitter and a couple of 40-meter crystals.  I dutifully stayed on 40 
(except when my 2nd harmonic worked an FCC monitoring station and I received a 
"pink" QSL.  My high school English teacher helped me write a very convincing 
letter to them)


Always a DXer at heart, I would stay up all night during the summer eking out 
QSOs on 40.  My Elmer finally took pity on me and loaned me an Elmac AF67 that 
worked 10-meter AM.  What a revelation; on 40 I would spend nights trying to 
work VK, on 10 I was working them by the dozen on phone in the daytime.  Magical.


Wes

ps. I can also remember seeing aurora here in Tucson, 32deg N.

On 7/22/2016 11:17 AM, Guy Olinger K2AV wrote:

I remember 1956 - 1958. Conditions have never been that way since. We are
in the trough of a very long term solar super-cycle that had a peak in
1956.



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Re: [Elecraft] Solar Cycle

[Guy Olinger K2AV]

Nova is normally on your local PBS channel.

73, Guy K2AV

On Friday, July 22, 2016, Mel Farrer via Elecraft 
wrote:

> I have tried to find the NOVA series on Direct TV without success.  Anyone
> know what channel it will be on?
> Mel, K6KBE
>
>
>   From: Grant Youngman >
>  To: elecraft@mailman.qth.net 
>  Sent: Friday, July 22, 2016 11:01 AM
>  Subject: Re: [Elecraft] Solar Cycle
>
> Or even DX on 15 at 2-3 o'clock in the morning.  My little DX-40 worked a
> lot of DX in those days -- phone and CW -- and it rarely mattered what time
> of day it was.
>
> I don't think conditions have been anywhere close to that since 
>
> Grant NQ5T
>
> Sent from my iPhone
>
> > On Jul 22, 2016, at 1:22 PM, Kevin Cozens  > wrote:
> >
> >> On 16-07-21 10:43 PM, Don Wilhelm wrote:
> >> I was first licensed in 1955 and cycle 19 (the granddaddy of them all)
> was
> >> on the rise.
> >> Those were the times when you could work the world with 10 watts on 10
> >> meters during the daytime hours.
> >
> > The bands would have been a lot quieter back in the 50's as there was
> neither the population density nor the amount of technology to pollute the
> airwaves with stray RF signals.
> >
> > --
> > Cheers!
> >
> > Kevin.
> >
> >
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>
>
>
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Re: [Elecraft] Solar Cycle

[Mel Farrer via Elecraft]

I have tried to find the NOVA series on Direct TV without success.  Anyone know 
what channel it will be on?
Mel, K6KBE


  From: Grant Youngman 
 To: elecraft@mailman.qth.net 
 Sent: Friday, July 22, 2016 11:01 AM
 Subject: Re: [Elecraft] Solar Cycle
   
Or even DX on 15 at 2-3 o'clock in the morning.  My little DX-40 worked a lot 
of DX in those days -- phone and CW -- and it rarely mattered what time of day 
it was. 

I don't think conditions have been anywhere close to that since 

Grant NQ5T 

Sent from my iPhone

> On Jul 22, 2016, at 1:22 PM, Kevin Cozens  wrote:
> 
>> On 16-07-21 10:43 PM, Don Wilhelm wrote:
>> I was first licensed in 1955 and cycle 19 (the granddaddy of them all) was
>> on the rise.
>> Those were the times when you could work the world with 10 watts on 10
>> meters during the daytime hours.
> 
> The bands would have been a lot quieter back in the 50's as there was neither 
> the population density nor the amount of technology to pollute the airwaves 
> with stray RF signals.
> 
> -- 
> Cheers!
> 
> Kevin.
> 
> 
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Re: [Elecraft] Solar Cycle

[Guy Olinger K2AV]

I remember 1956 - 1958. Conditions have never been that way since. We are
in the trough of a very long term solar super-cycle that had a peak in
1956.

In '56 every day in Columbus OH I could see test patterns on channel 2 from
Miami FL. Oh, to have had a K3/KPA500 back then.

11 meters was a ham band on my friend's dad's 75A3. And 10 was jumping.

73, Guy K2AV

On Friday, July 22, 2016, Grant Youngman  wrote:

> Or even DX on 15 at 2-3 o'clock in the morning.  My little DX-40 worked a
> lot of DX in those days -- phone and CW -- and it rarely mattered what time
> of day it was.
>
> I don't think conditions have been anywhere close to that since 
>
> Grant NQ5T
>
> Sent from my iPhone
>
> > On Jul 22, 2016, at 1:22 PM, Kevin Cozens  > wrote:
> >
> >> On 16-07-21 10:43 PM, Don Wilhelm wrote:
> >> I was first licensed in 1955 and cycle 19 (the granddaddy of them all)
> was
> >> on the rise.
> >> Those were the times when you could work the world with 10 watts on 10
> >> meters during the daytime hours.
> >
> > The bands would have been a lot quieter back in the 50's as there was
> neither the population density nor the amount of technology to pollute the
> airwaves with stray RF signals.
> >
> > --
> > Cheers!
> >
> > Kevin.
> >
> >
> __
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> Message delivered to k2av@gmail.com 
>


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Re: [Elecraft] KAT-500 Bypass indication/operation issue

[w4sc]

Misspoke, I meant "BYPASS" LED
Ben

-Original Message- 
From: Dick Dievendorff

Sent: Friday, July 22, 2016 12:57 PM
To: 'w4sc'
Cc: elecraft@mailman.qth.net
Subject: RE: [Elecraft] KAT-500 Bypass indication/operation issue

When the ATU TUNE function discovers the SWR is less than the bypass 
threshold, it should select "bypassed" as the tuning solution, and the 
KAT500 Utility should show no L or C values selected.  It should also show 
the "bypassed" check box.


I don't have a "standby" LED.

The "BYPASS" LED means that the ATU's mode is "BYPASSED", not that the 
current ATU tuning solution is "Bypassed".


73 de Dick, K6KR





-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of w4sc
Sent: Friday, July 22, 2016 09:09
To: Elecraft 
Subject: [Elecraft] KAT-500 Bypass indication/operation issue

When SWR is less than 1.3 (factory default), the KAT-500 should go into 
“BYPASS” as I understand.


The LC values and MODE (Manual) from the previously selected antenna are 
still shown in the config utility “Operate TAB”.


Also, the STANDBY LED has never illuminated when the SWR measurement is less 
than the threshold set for entering the BYPASS mode.


Firmware installed

   K3:  5.38
   KAT-500: 1.67

de Ben W4SC


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Re: [Elecraft] 20 meters is dead all day

[EricJ]

I'm one of "those guys". I operated JT65-HF and JT9 for a couple years 
with my oldest K2 (SN 567), including half a dozen contacts with K1JT 
hisself. First time ever working a guy on a mode he invented. hi.


It's a very interesting mode, but limited fun for a 60 year veteran of 
CW mostly interested in ragchewing and county hunting. My primary 
activity in ham radio these days is homebrewing left-handed bugs. They 
work fine for the original digital mode, but don't adapt easily to the 
newfangled ones.


I actually do tune 14.076 as a quick check on propagation because there 
is so much activity. If there are signals there, I'm fairly sure I can 
be heard on CW if anybody is listening.


Operating digital modes (WSJT and PSK) is the only time my K2 has ever 
been on SSB. I've used it barefoot, with an HF Packer amp and with the 
KPA100. It does a great job on these modes.


Eric KE6US


On 7/22/2016 10:24 AM, Sid Frissell wrote:

You "20 meters is dead all day" guys need to check out WSJT-X (JT-9 and JT-65).
At least here in MT 14076 is busy every day all day!  You can find many US and 
VE stations plus a very good mix of DX. I have only been on this mode since 
late in 2014  (been a ham since 1950) and I have worked over 100 DX entities.  
{I started over when I took up digital.  New ones are still popping up.  Plenty 
of QSO's.  No rag-chewing of course !!!  Also, my DX spotter in DXLabd seems to 
keep rolling out spots all day--many on 20, both SSB and cw.  Try 14076.
I call it "Mouse-click Radio" as thats all you have to do. At least you will 
hear (see?) activity.

73, Sid.  NZ7M

Sent From Sid Frissell's iPad
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Re: [Elecraft] Solar Cycle

[Grant Youngman]

Or even DX on 15 at 2-3 o'clock in the morning.  My little DX-40 worked a lot 
of DX in those days -- phone and CW -- and it rarely mattered what time of day 
it was. 

I don't think conditions have been anywhere close to that since 

Grant NQ5T 

Sent from my iPhone

> On Jul 22, 2016, at 1:22 PM, Kevin Cozens  wrote:
> 
>> On 16-07-21 10:43 PM, Don Wilhelm wrote:
>> I was first licensed in 1955 and cycle 19 (the granddaddy of them all) was
>> on the rise.
>> Those were the times when you could work the world with 10 watts on 10
>> meters during the daytime hours.
> 
> The bands would have been a lot quieter back in the 50's as there was neither 
> the population density nor the amount of technology to pollute the airwaves 
> with stray RF signals.
> 
> -- 
> Cheers!
> 
> Kevin.
> 
> 
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Re: [Elecraft] K3 (not S) Antenna tuner strangeness

[Bill Conkling]

Try a “slightly different tap position” and see what happens.  Your words, not 
mine.

…bill  nr4c



> On Jul 22, 2016, at 12:19 PM, brian  wrote:
> 
> Guys,
> 
> I've run into something on 80M trying to use the internal antenna tuner.
> It fails to tune to a low SWR.
> 
> My recollection is that the tuner worked fine on the same antenna before. 
> "Worked before" may have been with a slightly different tap position.
> 
> Antenna is an MFJ 1/8 Wave vertical with loading coil and 4:1 "Guanella" 
> balun at the antenna base.
> 
> With the current coil tap an RF analyst antenna analyzer shows the following:
> 
> 3.55 MHz SWR=2.0  Z=35 ohms
> 3.6  SWR=2.7  Z=36 ohms
> 
> The K3 in the tune position (tuner out) shows SWR's of 1.7 and 2.4 
> respectively.
> 
> The antenna tuner finds a match for a 50 ohm dummy load OK.  Using those 
> settings as a starting point, we attempted to match the antenna.
> 
> The best it can do is bring the 1.7 SWR down to 1.4.  The 2.0 SWR can brought 
> down to 1.7 at best.
> 
> Other bands work OK.
> 
> Any thoughts?
> 
> 73 de Brian/K3KO
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[Elecraft] [K3S] Test Procedure

[Jerry Moore]

Does anyone have a full functional test procedure to verify my K3S is fully
operational?

I had a local lightning strike came in through ground that apparently
damaged a USB hub, Raspberry PI, Keyboard, Mouse... I suspect the K3s may be
damaged as well (especially the USB).
I'm looking for a full test process so I can find all of the damage first
time around rather than hunt/peck.

The K3S powers and appears to rx/tx,
Thanks in advance
Jerry Moore, AE4PB

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[Elecraft] 20 meters is dead all day

[Sid Frissell]

You "20 meters is dead all day" guys need to check out WSJT-X (JT-9 and JT-65). 
 
At least here in MT 14076 is busy every day all day!  You can find many US and 
VE stations plus a very good mix of DX. I have only been on this mode since 
late in 2014  (been a ham since 1950) and I have worked over 100 DX entities.  
{I started over when I took up digital.  New ones are still popping up.  Plenty 
of QSO's.  No rag-chewing of course !!!  Also, my DX spotter in DXLabd seems to 
keep rolling out spots all day--many on 20, both SSB and cw.  Try 14076.
I call it "Mouse-click Radio" as thats all you have to do. At least you will 
hear (see?) activity.

73, Sid.  NZ7M

Sent From Sid Frissell's iPad
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Re: [Elecraft] Solar Cycle

[Kevin Cozens]

On 16-07-21 10:43 PM, Don Wilhelm wrote:

I was first licensed in 1955 and cycle 19 (the granddaddy of them all) was
on the rise.
Those were the times when you could work the world with 10 watts on 10
meters during the daytime hours.


The bands would have been a lot quieter back in the 50's as there was 
neither the population density nor the amount of technology to pollute the 
airwaves with stray RF signals.


--
Cheers!

Kevin.

http://www.ve3syb.ca/   |"Nerds make the shiny things that distract
Owner of Elecraft K2 #2172  | the mouth-breathers, and that's why we're
| powerful!"
#include  | --Chris Hardwick
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Re: [Elecraft] Solar Cycle

[EricJ]

Secrets of the Sun. Took 5 seconds on google to discover it is on 
youtube.com, and blocked in my area (So Cal) on PBS.


Eric KE6US



On 7/21/2016 9:22 PM, tomb18 wrote:

Just open a panadapter on 20m during the day...depressing. makes you wonder if 
it's working


Sent from my Samsung Galaxy smartphone.
 Original message From: w7aqk  Date: 2016-07-21  11:37 
PM  (GMT-05:00) To: a...@sbcglobal.net, Elecraft Reflector  
Subject: Re: [Elecraft] Solar Cycle
I’m currently traveling in Oregon, and watched it on the Portland area PBS 
station (Oregon Public Broadcasting).  I assume it is the most current program 
in the Nova series, but I missed the actual title as I didn’t tune in until 
about 5 minutes after it started.  Sometimes there is a slight lag between on 
air viewing and their website availability, but just about every Nova program 
ends up on the website for viewing online.  Check the dates shown, and it 
should be the one for this week.  If it’s not there yet, it will be, and they 
even said it would be available online.  Also, most PBS stations broadcast Nova 
multiple times during the week, so check your own station’s schedule for the 
week.  Looking at OPB’s schedule, I think the title may be “ Secrets OF The 
Sun”.  Here it is being aired multiple times this week.

I might just add that there are few programs on TV these days that are better 
than Nova.  It is marvelous!  My other favorite is “Frontline”, but, of course, 
there are still other superb programs that are pure entertainment, like 
“Masterpiece”.  If you are not a regular PBS viewer, I think you are really 
missing something!  My satellite TV system gives me just about anything that is 
available, but in truth, I could probably survive quite nicely with just two 
channels—PBS and Turner Classic Movies!  Well, I do like to watch a little golf 
and football!  Hi.

Dave W7AQK



From: a...@sbcglobal.net
Sent: Thursday, July 21, 2016 2:25 PM
To: Elecraft Reflector ; w7aqk
Subject: Re: [Elecraft] Solar Cycle

   Can you check your PBS TV station schedule and give us the title of that 
NOVA program? Our station was running the RNC.

   Sent from Yahoo Mail on Android
  





From: w7aqk ;
To: Elecraft Reflector ;
Subject: [Elecraft] Solar Cycle
Sent: Thu, Jul 21, 2016 7:05:56 PM


   Hi All,

   FWIW, there was a very interesting program I watched last night on PBS.  
The
   regular program called "Nova" had a most informative discussion about the
   solar cycle and how it affects us here on Earth.  It won't tell you
   everything you want to know about propagation, etc., but it does give a 
lot
   of perspective as to why our communications can be so disrupted by solar
   storms.  They also talked a lot about "sunspots"!  We tend to think the 
more
   the better for us, but do we really understand how they form, and the 
effect
   they have?  This gives you some insight about that.

   Anyway, you might want to check it out, and I think you can watch it 
online
   at www.pbs.org/nova.

   Dave W7AQK


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Re: [Elecraft] Solar Cycle

[EricJ]

Secrets of the Sun. Took 5 seconds on google to discover it is on 
youtube.com, and blocked in my area (So Cal) on PBS.


Eric KE6US



On 7/21/2016 9:22 PM, tomb18 wrote:

Just open a panadapter on 20m during the day...depressing. makes you wonder if 
it's working


Sent from my Samsung Galaxy smartphone.
 Original message From: w7aqk  Date: 2016-07-21  11:37 
PM  (GMT-05:00) To: a...@sbcglobal.net, Elecraft Reflector  
Subject: Re: [Elecraft] Solar Cycle
I’m currently traveling in Oregon, and watched it on the Portland area PBS 
station (Oregon Public Broadcasting).  I assume it is the most current program 
in the Nova series, but I missed the actual title as I didn’t tune in until 
about 5 minutes after it started.  Sometimes there is a slight lag between on 
air viewing and their website availability, but just about every Nova program 
ends up on the website for viewing online.  Check the dates shown, and it 
should be the one for this week.  If it’s not there yet, it will be, and they 
even said it would be available online.  Also, most PBS stations broadcast Nova 
multiple times during the week, so check your own station’s schedule for the 
week.  Looking at OPB’s schedule, I think the title may be “ Secrets OF The 
Sun”.  Here it is being aired multiple times this week.

I might just add that there are few programs on TV these days that are better 
than Nova.  It is marvelous!  My other favorite is “Frontline”, but, of course, 
there are still other superb programs that are pure entertainment, like 
“Masterpiece”.  If you are not a regular PBS viewer, I think you are really 
missing something!  My satellite TV system gives me just about anything that is 
available, but in truth, I could probably survive quite nicely with just two 
channels—PBS and Turner Classic Movies!  Well, I do like to watch a little golf 
and football!  Hi.

Dave W7AQK



From: a...@sbcglobal.net
Sent: Thursday, July 21, 2016 2:25 PM
To: Elecraft Reflector ; w7aqk
Subject: Re: [Elecraft] Solar Cycle

   Can you check your PBS TV station schedule and give us the title of that 
NOVA program? Our station was running the RNC.

   Sent from Yahoo Mail on Android
  





From: w7aqk ;
To: Elecraft Reflector ;
Subject: [Elecraft] Solar Cycle
Sent: Thu, Jul 21, 2016 7:05:56 PM


   Hi All,

   FWIW, there was a very interesting program I watched last night on PBS.  
The
   regular program called "Nova" had a most informative discussion about the
   solar cycle and how it affects us here on Earth.  It won't tell you
   everything you want to know about propagation, etc., but it does give a 
lot
   of perspective as to why our communications can be so disrupted by solar
   storms.  They also talked a lot about "sunspots"!  We tend to think the 
more
   the better for us, but do we really understand how they form, and the 
effect
   they have?  This gives you some insight about that.

   Anyway, you might want to check it out, and I think you can watch it 
online
   at www.pbs.org/nova.

   Dave W7AQK


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Re: [Elecraft] KAT-500 Bypass indication/operation issue

[Dick Dievendorff]

When the ATU TUNE function discovers the SWR is less than the bypass threshold, 
it should select "bypassed" as the tuning solution, and the KAT500 Utility 
should show no L or C values selected.  It should also show the "bypassed" 
check box.

I don't have a "standby" LED.

The "BYPASS" LED means that the ATU's mode is "BYPASSED", not that the current 
ATU tuning solution is "Bypassed".

73 de Dick, K6KR





-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of w4sc
Sent: Friday, July 22, 2016 09:09
To: Elecraft 
Subject: [Elecraft] KAT-500 Bypass indication/operation issue

When SWR is less than 1.3 (factory default), the KAT-500 should go into 
“BYPASS” as I understand.

The LC values and MODE (Manual) from the previously selected antenna are still 
shown in the config utility “Operate TAB”.

Also, the STANDBY LED has never illuminated when the SWR measurement is less 
than the threshold set for entering the BYPASS mode.

Firmware installed

K3:  5.38
KAT-500: 1.67

de Ben W4SC


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[Elecraft] K3 (not S) Antenna tuner strangeness

[brian]

Guys,

I've run into something on 80M trying to use the internal antenna tuner.
It fails to tune to a low SWR.

My recollection is that the tuner worked fine on the same antenna 
before. "Worked before" may have been with a slightly different tap 
position.


Antenna is an MFJ 1/8 Wave vertical with loading coil and 4:1 "Guanella" 
balun at the antenna base.


With the current coil tap an RF analyst antenna analyzer shows the 
following:


3.55 MHz SWR=2.0  Z=35 ohms
3.6  SWR=2.7  Z=36 ohms

The K3 in the tune position (tuner out) shows SWR's of 1.7 and 2.4 
respectively.


The antenna tuner finds a match for a 50 ohm dummy load OK.  Using those 
settings as a starting point, we attempted to match the antenna.


The best it can do is bring the 1.7 SWR down to 1.4.  The 2.0 SWR can 
brought down to 1.7 at best.


Other bands work OK.

Any thoughts?

73 de Brian/K3KO
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[Elecraft] KAT-500 Bypass indication/operation issue

[w4sc]

When SWR is less than 1.3 (factory default), the KAT-500 should go into 
“BYPASS” as I understand.

The LC values and MODE (Manual) from the previously selected antenna are still 
shown in the config utility “Operate TAB”.

Also, the STANDBY LED has never illuminated when the SWR measurement is less 
than the threshold set for entering the BYPASS mode.

Firmware installed

K3:  5.38
KAT-500: 1.67

de Ben W4SC


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[Elecraft] Very small KX2 earbud/mic/adapter

[K5WA]

I wanted to optimize my KX2 experience with the smallest headset I could
find.  I stumbled across the Panasonic ErgoFit (see link below) which are
the best fitting ear buds I've ever tried with the added bonus of a built in
microphone.  Previous ear buds always fell out of my ear or were so loose
fitting which let in outside noise.  These fit perfectly and securely hold
in place to block outside noise.  I can highly recommend them if you are
trying to find the smallest/lightest option for your KX2.  
 
The second piece of the puzzle was how to connect the 4 conductor plug to
both the phones and microphone jacks on the KX2.  The second link below is
an adapter that proved to work perfectly in separating mic and phones.  The
mic is built into the ear bud wire and takes up very little space.  The mic
is a bit bassy but tweaking the TX equalizer cured that.  I also felt more
comfortable holding the mic closer to my mouth but that may have also caused
the bassiness.  
 
I tried a different adapter bought from Amazon and it did NOT work so be
careful on what you buy.  Fortunately, a "mistake" only costs you a few
bucks but this one I list below works great.  Apparently, the 4 conductor
standard is not as standard as people expect so adapters and plugs don't
always work.  I'm not saying this is the only adapter/headset that works
with the KX2 but it is one that I accidentally stumbled upon that works for
me.  Plus, it is very reasonably priced.  ;-)
 
Standard disclaimer, if needed.  I don't work for or promote these items for
a living.
 
Have fun,
Bob K5WA
 
https://www.amazon.com/gp/product/B00E4LGVUO/ref=od_aui_detailpages00?ie=UTF
8
 =1
 
http://www.mycablemart.com/store/cart.php?m=product_detail

=6025=CjwKEAjwiMe8BRD0ts3Vtv-ohWgSJAAZurk1Nb_zbSyuYyHMd9iraondI0Kh-4
XUauI4v0VsF-bUfBoCQSnw_wcB
 
 
 
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Re: [Elecraft] Linear PS Recommendations

[David Anderson via Elecraft]

I have a couple of homebuilt DC regulated supplies that I built a great many 
years ago, the first is a simple 3A 13.5V one that was the very first supply I 
ever built and it used a 723 with a single 2N3055 series pass transistor. I 
remember I bought a lovely oil filled mains transformer for it, but 
accidentally wired up the 120V windings in parallel instead of series for our 
240V mains and watched it start to bulge when I switched it on. (after I put a 
bigger fuse in it).  I ended up using another transformer and the power supply 
is still in daily use, built in the early 70's.

I later built a 25 Amp version with 4 3055s and a 723 with overvoltage trip, 
and also short circuit protection. It can be shorted out and with barely a 
spark it trips out and has to be reset before it comes on again. No fuses to 
blow and replace, no destroyed series pass transistors. I built it in a chassis 
that was lying around and 35 years later it is still in daily use and still not 
got a proper cover made for the chassis.  I checked the output the other day on 
my scope to see if there was any hum or ripple and on full load I had 10mV p-p 
of noise. Regulation still excellent.

Nothing much wrong with the humble 723. 

I have seen some truly awful "commercial" supplies with no short circuit 
protection, that blow the series pass transistors like fuses, or worse make 
them into short circuits that apply the full unregulated supply on to the load.

73 from David GM4JJJ

> On 22 Jul 2016, at 15:55, Alan Bloom  wrote:
> 
> The 723 regulator has some known reliability issues, but with proper design 
> they can be mitigated.  In particular the differential voltage on the error 
> amplifier inputs is only rated for 5v.  If one input is connected to the 
> 7.15V reference, then if the power supply output is shorted the voltage 
> rating is exceeded.  The solution is a strategically-placed diode.
> 
> Alan N1AL
> 
> 

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[Elecraft] K3S K3EXREF 10MHz Voltage Help

[MaverickNH]

The manual says:
http://www.elecraft.com/manual/E740156%20K3EXREF%20Installation%20and%20Operation%20Manual%20Rev%20A2.pdf
Connect the external 10 MHz signal source to the K3 rear panel REF connector
. The 10 MHz source should have a signal levelbetween +4 dBm and +16 dBm,
nominal
. For square wave sources, 2VDC to 3.3VDC peak is optimum. If the source is
a 5V logic level, use a 50-ohm resistor in series with the input. 
Caution: To avoid damage to the K3EXREF, do not exceed these levels

My Jackson Labs LC-XO-Plus manual says:
http://www.jackson-labs.com/assets/uploads/main/LC_XO-PLUS-specsheet1.pdf
Oscillator Specification: Frequency Output 10MHz CMOS 5Vpp

So I'm concluding the need for a 50ohm resister in series with the input.

The K3EXREF board will come pre-installed with my new K3S, so I'd prefer an
exterior solution. Is there a tidy little SMA connector with 50ohm in series
that I can get off the shelf? Or would I have to make that? If so, how to
best do that? I can certainly chop a SMA(M)-SMA(M) jumper in half and solder
a 50ohm resister across the center wire, but I'm not sure how to maintain
the shielding ground web. Twist each side and solder, sure, but seems I lose
shielding of a delicate signal.

Thanks for the help!

BRET/KC1CJN







--
View this message in context: 
http://elecraft.365791.n2.nabble.com/K3S-K3EXREF-10MHz-Voltage-Help-tp7620550.html
Sent from the Elecraft mailing list archive at Nabble.com.
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Re: [Elecraft] Linear PS Recommendations

[Alan Bloom]

The 723 regulator has some known reliability issues, but with proper 
design they can be mitigated.  In particular the differential voltage on 
the error amplifier inputs is only rated for 5v.  If one input is 
connected to the 7.15V reference, then if the power supply output is 
shorted the voltage rating is exceeded.  The solution is a 
strategically-placed diode.


Alan N1AL


On 07/22/2016 12:14 AM, Richard Fjeld wrote:

I was glad that I caught Jim's remark about blowing the 723 by being
connected to a battery with the PS off.  And also Myron's answer.

Back in the tube TV days, I purchased a bare circuit board at Radio
Shack, (I think). The board was similar to an Astron circuit board, but
simpler.  I rewound a heavy transformer from a color TV and made my
first 13.8 Volt power supply to use for a Heathkit HW-104.  Years later,
the 723 went bad.  It may have been due to the stated reason, I can't
remember now.  I did some repair work on it and still have it.

Someone on the reflector provided the following link one time, which I
think is a good idea for an extra measure of over-voltage protection or
accidental reversal in polarity. I remember discussion about a reversal
that happened to someone on the reflector not long ago.

I hope the link still works on here.  If it doesn't, it is on ad5x dot
com website. Look for a Vprotect pdf file.
http://ad5x.com/images/Articles/Vprotect.pdf

Dick, n0ce



On 7/21/2016 7:41 AM, Myron Schaffer wrote:

Jim and Clay,

It used to be that waythe RS linear models could not tolerate
external voltage present when unpowered, not anymore. Astron has
incorporated back-voltage protection through incorporation of some
diodes installed in key locations to prevent this.

You can verify if your supply has this modification by looking at the
circuit board and see a 1N4001 type diode soldered across 2-pins
(can't remember which ones off the top of my head) of the IC voltage
regulator LM-723 chip and others hung in various places to protect
the pass transistor as well. Usually soldered to the solder side of
the circuit board so they are easy to spot. I can't remember is there
were some small capacitors added as well.

Any newer (like newer than 1990) linear Astron will have these
installed.

Myron WVØH
Printed on Recycled Data


-

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[Elecraft] F/S - K3/K3s filter

[Mike Murray]

One filter still available for shipment - KFL3A-1.8K.  Packaged and shipped
Priority Mail for $105.  PayPal preferred.

Mike
W0AG
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Re: [Elecraft] Linear PS Recommendations

[John Oppenheimer]

Hi All,

Here is a link to a schematic for the 3/4 A power supplies with the
added parts for external voltage protection:

http://www.ameradio.com/doc/Astron%20RS-3A,%20RS-4A%20schematic.pdf

John KN5L

On 07/21/2016 07:41 AM, Myron Schaffer wrote:
> It used to be that waythe RS linear models could not tolerate external 
> voltage present when unpowered, not anymore. Astron has incorporated 
> back-voltage protection through incorporation of some diodes installed in key 
> locations to prevent this.
> 
> You can verify if your supply has this modification by looking at the circuit 
> board and see a 1N4001 type diode soldered across 2-pins (can't remember 
> which ones off the top of my head) of the IC voltage regulator LM-723 chip 
> and others hung in various places to protect the pass transistor as well. 
> Usually soldered to the solder side of the circuit board so they are easy to 
> spot. I can't remember is there were some small capacitors added as well.
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Re: [Elecraft] KX3 ACC1 Spliter

[Joe DeVincentis]

I run a SteppIr with my KX3.  The KX3 will send out its current frequency via 
ACC1 so the SteppIR can automatically change bands.  I have a splitter going 
from the PC to the SteppIR and the KXPA100 (which eventually chains to the KX3 
via my PX3).  

It all works just fine.  If the SideKar sends data on the serial port at the 
same time as the PC or KX3, then that could be a problem.  For the SteppIR, it 
is a listen only device.

Works just fine.

Joe
KO8V

> On Jul 21, 2016, at 9:27 PM, stanley frady via Elecraft 
>  wrote:
> 
> I want to know if the KX3, PX3, etc ACC1 can be broken out to go 2 devices 
> such as a PC or Sidekar.  Appears to me to be a serial network like 
> Icoms CV system.
> 
> Thanks,
> Stan
> 

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Re: [Elecraft] Linear PS Recommendations

[Richard Fjeld]

I was glad that I caught Jim's remark about blowing the 723 by being 
connected to a battery with the PS off.  And also Myron's answer.


Back in the tube TV days, I purchased a bare circuit board at Radio 
Shack, (I think). The board was similar to an Astron circuit board, but 
simpler.  I rewound a heavy transformer from a color TV and made my 
first 13.8 Volt power supply to use for a Heathkit HW-104.  Years later, 
the 723 went bad.  It may have been due to the stated reason, I can't 
remember now.  I did some repair work on it and still have it.


Someone on the reflector provided the following link one time, which I 
think is a good idea for an extra measure of over-voltage protection or 
accidental reversal in polarity. I remember discussion about a reversal 
that happened to someone on the reflector not long ago.


I hope the link still works on here.  If it doesn't, it is on ad5x dot 
com website. Look for a Vprotect pdf file.

http://ad5x.com/images/Articles/Vprotect.pdf

Dick, n0ce



On 7/21/2016 7:41 AM, Myron Schaffer wrote:

Jim and Clay,

It used to be that waythe RS linear models could not tolerate external 
voltage present when unpowered, not anymore. Astron has incorporated 
back-voltage protection through incorporation of some diodes installed in key 
locations to prevent this.

You can verify if your supply has this modification by looking at the circuit 
board and see a 1N4001 type diode soldered across 2-pins (can't remember which 
ones off the top of my head) of the IC voltage regulator LM-723 chip and others 
hung in various places to protect the pass transistor as well. Usually soldered 
to the solder side of the circuit board so they are easy to spot. I can't 
remember is there were some small capacitors added as well.

Any newer (like newer than 1990) linear Astron will have these installed.

Myron WVØH
Printed on Recycled Data


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