Re: [Elecraft] "L" network problem solver?

[Igor Sokolov]

Antenna modeling software MMANA has got such a calculator built in.

http://www.softpedia.com/get/Science-CAD/MMANA-GAL.shtml

73, Igor UA9CDC

- Original Message - 
From: "Sandy" 
To: "Elecraft List" ; 

Sent: Tuesday, July 05, 2011 9:57 AM
Subject: [Elecraft] "L" network problem solver?


> Somewhere on the web I found a program that you feed in the vector 
> impedance
> of an antenna ( say 123-j58 ohms) and it will give you the values of an 
> "L"
> network to match this to a 50 ohm transmitter.
>
> Anybody recall where one of these "calculators" is on the internet?
>
> I had one on my former computer but the datat was lost when a big 
> lightning
> bolt took out the machine!
>
>
>
> 73,
>
> Sandy W5TVW
>
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Re: [Elecraft] "L" network problem solver?

[Tony Estep]

On Mon, Jul 4, 2011 at 10:57 PM, Sandy  wrote:

> Somewhere on the web I found a program that you feed in the vector
> impedance


This looks as if it'll do the job:

http://home.sandiego.edu/~ekim/e194rfs01/jwmatcher/matcher2.html

Tony KT0NY
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[Elecraft] "L" network problem solver?

[Sandy]

Somewhere on the web I found a program that you feed in the vector impedance 
of an antenna ( say 123-j58 ohms) and it will give you the values of an "L" 
network to match this to a 50 ohm transmitter.

Anybody recall where one of these "calculators" is on the internet?

I had one on my former computer but the datat was lost when a big lightning 
bolt took out the machine!



73,

Sandy W5TVW 

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Re: [Elecraft] Looking for miniature 14-V power supply for travel use

[Dick Dievendorff]

Maybe Gamma Research's HPS-1a at http://www.gammaresearch.net/hps-1a.html
will meet your needs.

It's 3.37" x 1.55 x 5.25",  specified to provide 5A continuous and 22A at a
25% duty cycle.  It weighs 1.25 pounds (which probably doesn't include the
line cord)

I have one for my K3, and it works acceptably on CW, but I wouldn't use it
for a RTTY contest.

I recall that it has about a 5 Farad output capacitance and the caps are
operated very close to their rated limit. My recollection may be fuzzy.

Their web site shows "temporarily out of stock" and to expect a delay after
placing an order.

Perhaps one of your employees might loan his if you can't get one in time.

73 de Dick, K6KR


On Jul 4, 2011, at 2:23 PM, Wayne Burdick wrote:

> I'm going to take a KX3 with me on vacation this summer, and I like to 
> travel light. I'll have internal batteries for field operation, but 
> for indoor use, I'm hoping to find a miniature power supply that meets 
> these criteria:
>
> - very small (say 4 x 3 x 1 inches)
> - light weight (less than 1 lb)
> - 2 A min. peak output current
> - 13 to 14 VDC output voltage
> - input AC voltage range of 100-130 V
> - low noise
>
> I'm sure it will have to be a switching supply. The question is 
> whether any exist with this form-factor that are also quiet from an RF 
> perspective.
>
> Anyone know of such a unit?
>
> 73,
> Wayne
> N6KR
>
>
>
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[Elecraft] Since i consider you a friend

[jrf59]

For Everyone I know,   Im rarely one to recommend a product unless its really 
something phenomenal but I have been taking this stuff that my dr. recommended 
for weight loss and ive lost eight pounds in a week. Two of my friends who just 
began using it also lost 6 pounds each. Facebook Sponsored:  
http://apps.facebook.com/acaimagic/?coupon=6726vw0 PS this Facebook site 
sells it for half as much as other sites
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Re: [Elecraft] Flying with K2

[Phil Kane]

On 7/4/2011 4:52 PM, Ron D'Eau Claire wrote:

> So you are saying that AGM technology has caught up with and
> surpassed Gel Cells. That wouldn't be the first time I was caught
> not paying attention to technology.

> The AGM is easier than the Gel Cell to charge too.

  Yes, especially when I charge them on my Mastercard. :-)

  Seriously, I've been using AGMs for the last two rounds of
  replacement and I am quite satisfied with their performance.


--  73 de K2ASP - Phil Kane
Elecraft K2/100   s/n 5402

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Re: [Elecraft] Looking for miniature 14-V power supply for travel use

[Al Gulseth]

Wayne,

When you do find what you're looking for in a power supply please let us know 
what it is and how it works out. I'm sure I'm not the only one who'd be 
interested in the results of your "research".

BTW other than most of them are marked as 12V (with typical output actually in 
the 12-12.6V range) little switchers of this type made for consumer 
electronics are very plentiful at thrift shops and yard sales (sometimes for 
less than a buck.) However, needless to say YMMV on the RFI issue though

TNX/73, Al

On Mon July 4 2011 4:23:14 pm Wayne Burdick wrote:
> I'm going to take a KX3 with me on vacation this summer, and I like to
> travel light. I'll have internal batteries for field operation, but
> for indoor use, I'm hoping to find a miniature power supply that meets
> these criteria:
>
> - very small (say 4 x 3 x 1 inches)
> - light weight (less than 1 lb)
> - 2 A min. peak output current
> - 13 to 14 VDC output voltage
> - input AC voltage range of 100-130 V
> - low noise
>
> I'm sure it will have to be a switching supply. The question is
> whether any exist with this form-factor that are also quiet from an RF
> perspective.
>
> Anyone know of such a unit?
>
> 73,
> Wayne
> N6KR
>
>
>
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Re: [Elecraft] Looking for miniature 14-V power supply for travel

[Jim Sheldon]

Well, it didn't completely disappear, but is attenuated to the point that 
atmospheric noise is far more of a problem than the p/s noise.  On a very quiet 
band, you'd still hear the p/s but any signals would be strong enough that even 
a S2 signal would be readable over it.  If the KX3's noise blanker/noise 
reduction is even close to a K3, you'd be able to live with it.  Not my choice 
for a primary QRP power supply, but certainly I'm keeping mine around as 
backups.
 
My primary station supply for the 100 watt K3 is an MFJ 4245MV 40 amp Switcher 
and there is absolutely no noise out of that one that I can find.  Far too big 
to work as a vacation supply.
 
Jim - W0EB

> Someone else mentioned the same issue. I asked if he had tried RF
> chokes, and he hadn't; he just put them on, and the noise
> disappeared.
>
> Wayne
>
> On Jul 4, 2011, at 5:34 PM, Phil & Debbie Salas wrote:
>
>> Wayne - I originally bought a CUP36 a number of years ago to use
>> with my
>> FT-817.  You DO have to purchase an AC cord (it doesn't come with
>> one) - and
>> it is a 2-pin power cord.  I found that the CUP36 was very RF
>> noisy -
>> particularly from 160-40 meters.  I wound up buying a MFJ-4103
>> which
>> I found
>> to be RF quiet.
>>
>> Phil - AD5X
>>
>> "Thanks, Randy. This is even smaller than the MFJ-4103.
>>
>> The web site indicates a noise problem without proper grounding.
>> Have
>> you found this to be an issue? They mention supplying a "2-pin"
>> standard power connector, which is *not* what you want if you're
>> trying to get a good common ground back to the AC jack. Is that a
>> typo
>> -- i.e., do they actually supply a 3-pin AC plug?
>>
>> Thanks,
>> Wayne
>> N6KR"
>>
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Re: [Elecraft] Looking for miniature 14-V power supply for travel

[Jim Sheldon]

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Re: [Elecraft] Looking for miniature 14-V power supply for travel

[Phil Hystad]

I bought some nice A123 Li batteries for this kind of thing.  A 3-cell or 
4-cell works great and may even last all day and then some with QRP power.  If 
you had a 100 watt amp, you could run that too!  I bought these from Buddipole 
and they work great.  Get the little 10s charger too.  Pricey solution but very 
conveniet.  Batteries are extremely RF quiet.

73, phil, K7PEH


On Jul 4, 2011, at 5:51 PM, Wayne Burdick wrote:

> Someone else mentioned the same issue. I asked if he had tried RF  
> chokes, and he hadn't; he just put them on, and the noise disappeared.
> 
> Wayne
> 
> On Jul 4, 2011, at 5:34 PM, Phil & Debbie Salas wrote:
> 
>> Wayne - I originally bought a CUP36 a number of years ago to use  
>> with my
>> FT-817.  You DO have to purchase an AC cord (it doesn't come with  
>> one) - and
>> it is a 2-pin power cord.  I found that the CUP36 was very RF noisy -
>> particularly from 160-40 meters.  I wound up buying a MFJ-4103 which  
>> I found
>> to be RF quiet.
>> 
>> Phil - AD5X
>> 
>> "Thanks, Randy. This is even smaller than the MFJ-4103.
>> 
>> The web site indicates a noise problem without proper grounding. Have
>> you found this to be an issue? They mention supplying a "2-pin"
>> standard power connector, which is *not* what you want if you're
>> trying to get a good common ground back to the AC jack. Is that a typo
>> -- i.e., do they actually supply a 3-pin AC plug?
>> 
>> Thanks,
>> Wayne
>> N6KR"
>> 
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Re: [Elecraft] Looking for miniature 14-V power supply for travel

[Wayne Burdick]

Someone else mentioned the same issue. I asked if he had tried RF  
chokes, and he hadn't; he just put them on, and the noise disappeared.

Wayne

On Jul 4, 2011, at 5:34 PM, Phil & Debbie Salas wrote:

> Wayne - I originally bought a CUP36 a number of years ago to use  
> with my
> FT-817.  You DO have to purchase an AC cord (it doesn't come with  
> one) - and
> it is a 2-pin power cord.  I found that the CUP36 was very RF noisy -
> particularly from 160-40 meters.  I wound up buying a MFJ-4103 which  
> I found
> to be RF quiet.
>
> Phil - AD5X
>
> "Thanks, Randy. This is even smaller than the MFJ-4103.
>
> The web site indicates a noise problem without proper grounding. Have
> you found this to be an issue? They mention supplying a "2-pin"
> standard power connector, which is *not* what you want if you're
> trying to get a good common ground back to the AC jack. Is that a typo
> -- i.e., do they actually supply a 3-pin AC plug?
>
> Thanks,
> Wayne
> N6KR"
>
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Re: [Elecraft] Looking for miniature 14-V power supply for travel

[Phil & Debbie Salas]

Wayne - I originally bought a CUP36 a number of years ago to use with my 
FT-817.  You DO have to purchase an AC cord (it doesn't come with one) - and 
it is a 2-pin power cord.  I found that the CUP36 was very RF noisy - 
particularly from 160-40 meters.  I wound up buying a MFJ-4103 which I found 
to be RF quiet.

Phil - AD5X

"Thanks, Randy. This is even smaller than the MFJ-4103.

The web site indicates a noise problem without proper grounding. Have
you found this to be an issue? They mention supplying a "2-pin"
standard power connector, which is *not* what you want if you're
trying to get a good common ground back to the AC jack. Is that a typo
-- i.e., do they actually supply a 3-pin AC plug?

Thanks,
Wayne
N6KR" 

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Re: [Elecraft] Looking for miniature 14-V power supply for travel use

[Rick Tavan]

Or consider sticking with batteries using the inexpensive and tiny PST-3P10 
charger on the same page at Mtechnologies. I haven't used it but the specs look 
good. 

Rick

On Jul 4, 2011, at 3:09 PM, Wayne Burdick  wrote:

> Thanks, Randy. This is even smaller than the MFJ-4103.
> 
> The web site indicates a noise problem without proper grounding. Have  
> you found this to be an issue? They mention supplying a "2-pin"  
> standard power connector, which is *not* what you want if you're  
> trying to get a good common ground back to the AC jack. Is that a typo  
> -- i.e., do they actually supply a 3-pin AC plug?
> 
> Thanks,
> Wayne
> N6KR
> 
> On Jul 4, 2011, at 3:00 PM, Randy Moore wrote:
> 
>> Wayne, I've had good luck with this:
>> 
>> http://www.mtechnologies.com/cup/
>> 
>> 73,
>> Randy, KS4L
>> 
>> On Jul 4, 2011, at 4:23 PM, Wayne Burdick  wrote:
>> 
>>> I'm going to take a KX3 with me on vacation this summer, and I like  
>>> to
>>> travel light. I'll have internal batteries for field operation, but
>>> for indoor use, I'm hoping to find a miniature power supply that  
>>> meets
>>> these criteria:
>>> 
>>> - very small (say 4 x 3 x 1 inches)
>>> - light weight (less than 1 lb)
>>> - 2 A min. peak output current
>>> - 13 to 14 VDC output voltage
>>> - input AC voltage range of 100-130 V
>>> - low noise
>>> 
>>> I'm sure it will have to be a switching supply. The question is
>>> whether any exist with this form-factor that are also quiet from an  
>>> RF
>>> perspective.
>>> 
>>> Anyone know of such a unit?
>>> 
>>> 73,
>>> Wayne
>>> N6KR
>>> 
>>> 
>>> 
>>> __
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> 
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Re: [Elecraft] Flying with K2

[Ron D'Eau Claire]

Hello Gene: 

 

So you are saying that AGM technology has caught up with and surpassed Gel
Cells. That wouldn't be the first time I was caught not paying attention to
technology. 

 

The AGM is easier than the Gel Cell to charge too. 

 

And it's funny that Elecraft has (apparently) gotten caught equating AGM and
Gel Cell technology, HI! 

 

Ron AC7AC

 

From: Gene Fuller [mailto:gefull...@comcast.net] 
Sent: Monday, July 04, 2011 3:57 PM
To: r...@cobi.biz
Subject: Re: [Elecraft] Flying with K2

 

Ron,

I think you have the features of the gel cell and AGM batteries reversed.
The AGM is better in virtually every way, and the AGM has almost completely
taken over the SLA market from the older gel cell technology.

The Elecraft web site says that the K2 battery is a gel cell, but that is
not correct. According to PowerSonic, the PS-1229 is an AGM. A recent data
sheet (2011) from PowerSonic notes under Features:

  Absorbent Glass Mat (AGM) technology for superior performance

The PS-1229 is what shipped with my K2. Perhaps at one time that model of
battery was a gel cell, but no longer.

73,
Gene
W4SZ
K2 1749

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Re: [Elecraft] Looking for miniature 14-V power supply for travel use

[Gary]

Wayne,
Take a look at these:

I realize they're a little bigger than you're looking for but not by much.
The 12Vdc/100 watt unit sells for less than $30. Output is adjustable
11-14Vdc.
Gary
N6LRV

-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Wayne Burdick
Sent: Monday, July 04, 2011 2:23 PM
To: Elecraft Reflector
Subject: [Elecraft] Looking for miniature 14-V power supply for travel use

I'm going to take a KX3 with me on vacation this summer, and I like to  
travel light. I'll have internal batteries for field operation, but  
for indoor use, I'm hoping to find a miniature power supply that meets  
these criteria:

- very small (say 4 x 3 x 1 inches)
- light weight (less than 1 lb)
- 2 A min. peak output current
- 13 to 14 VDC output voltage
- input AC voltage range of 100-130 V
- low noise

I'm sure it will have to be a switching supply. The question is  
whether any exist with this form-factor that are also quiet from an RF  
perspective.

Anyone know of such a unit?

73,
Wayne
N6KR


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Re: [Elecraft] Looking for miniature 14-V power supply for travel use

[Wayne Burdick]

Thanks, Randy. This is even smaller than the MFJ-4103.

The web site indicates a noise problem without proper grounding. Have  
you found this to be an issue? They mention supplying a "2-pin"  
standard power connector, which is *not* what you want if you're  
trying to get a good common ground back to the AC jack. Is that a typo  
-- i.e., do they actually supply a 3-pin AC plug?

Thanks,
Wayne
N6KR

On Jul 4, 2011, at 3:00 PM, Randy Moore wrote:

> Wayne, I've had good luck with this:
>
> http://www.mtechnologies.com/cup/
>
> 73,
> Randy, KS4L
>
> On Jul 4, 2011, at 4:23 PM, Wayne Burdick  wrote:
>
>> I'm going to take a KX3 with me on vacation this summer, and I like  
>> to
>> travel light. I'll have internal batteries for field operation, but
>> for indoor use, I'm hoping to find a miniature power supply that  
>> meets
>> these criteria:
>>
>> - very small (say 4 x 3 x 1 inches)
>> - light weight (less than 1 lb)
>> - 2 A min. peak output current
>> - 13 to 14 VDC output voltage
>> - input AC voltage range of 100-130 V
>> - low noise
>>
>> I'm sure it will have to be a switching supply. The question is
>> whether any exist with this form-factor that are also quiet from an  
>> RF
>> perspective.
>>
>> Anyone know of such a unit?
>>
>> 73,
>> Wayne
>> N6KR
>>
>>
>>
>> __
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Re: [Elecraft] Looking for miniature 14-V power supply for travel use

[Wayne Burdick]

This one does look promising, Bob--thanks.

I've also found some possible units at Jameco, which happens to be  
about a mile down the road (thank you, N6CM, for reminding me).

Wayne
N6KR

On Jul 4, 2011, at 2:46 PM, Bob Nielsen wrote:

> I have used a MFJ-4103 with my K2 with good results.  It's close to  
> your desired form factor and was quiet on 20 meters (I haven't tried  
> it on other bands).  I also used it on 220V/50Hz in EU.
>
> Bob, N7XY
>
> On Jul 4, 2011, at 2:23 PM, Wayne Burdick wrote:
>
>> I'm going to take a KX3 with me on vacation this summer, and I like  
>> to
>> travel light. I'll have internal batteries for field operation, but
>> for indoor use, I'm hoping to find a miniature power supply that  
>> meets
>> these criteria:
>>
>> - very small (say 4 x 3 x 1 inches)
>> - light weight (less than 1 lb)
>> - 2 A min. peak output current
>> - 13 to 14 VDC output voltage
>> - input AC voltage range of 100-130 V
>> - low noise
>>
>> I'm sure it will have to be a switching supply. The question is
>> whether any exist with this form-factor that are also quiet from an  
>> RF
>> perspective.
>>
>> Anyone know of such a unit?
>>
>> 73,
>> Wayne
>> N6KR
>>
>>
>>
>> __
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>
> _
> N7XY DX Cluster Node - telnet to n7xy.net, port 7300
>
>
>
>
>
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Re: [Elecraft] Looking for miniature 14-V power supply for travel use

[Rick Dettinger]

OK, but it would still make a great mini kit.  Especially since there  
may not be an acceptable substitute.

Rick   K7MW





On Jul 4, 2011, at 2:44 PM, Wayne Burdick wrote:

> Can't roll our own in time for my vacation :)
>
> Wayne
> N6KR
>
> On Jul 4, 2011, at 2:39 PM, Rick Dettinger wrote:
>
>> Well, Chief Engineer Wayne, sounds to me like a good idea for a  
>> mini kit !
>>
>> 73,
>> Rick Dettinger   K7MW
>>
>>
>>
>>
>> On Jul 4, 2011, at 2:23 PM, Wayne Burdick wrote:
>>
>>> I'm going to take a KX3 with me on vacation this summer, and I  
>>> like to
>>> travel light. I'll have internal batteries for field operation, but
>>> for indoor use, I'm hoping to find a miniature power supply that  
>>> meets
>>> these criteria:
>>>
>>> - very small (say 4 x 3 x 1 inches)
>>> - light weight (less than 1 lb)
>>> - 2 A min. peak output current
>>> - 13 to 14 VDC output voltage
>>> - input AC voltage range of 100-130 V
>>> - low noise
>>>
>>> I'm sure it will have to be a switching supply. The question is
>>> whether any exist with this form-factor that are also quiet from  
>>> an RF
>>> perspective.
>>>
>>> Anyone know of such a unit?
>>>
>>> 73,
>>> Wayne
>>> N6KR
>>>
>>>
>>>
>>> __
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>

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Re: [Elecraft] Looking for miniature 14-V power supply for travel use

[Bob Nielsen]

I have used a MFJ-4103 with my K2 with good results.  It's close to your 
desired form factor and was quiet on 20 meters (I haven't tried it on other 
bands).  I also used it on 220V/50Hz in EU.

Bob, N7XY

On Jul 4, 2011, at 2:23 PM, Wayne Burdick wrote:

> I'm going to take a KX3 with me on vacation this summer, and I like to  
> travel light. I'll have internal batteries for field operation, but  
> for indoor use, I'm hoping to find a miniature power supply that meets  
> these criteria:
> 
> - very small (say 4 x 3 x 1 inches)
> - light weight (less than 1 lb)
> - 2 A min. peak output current
> - 13 to 14 VDC output voltage
> - input AC voltage range of 100-130 V
> - low noise
> 
> I'm sure it will have to be a switching supply. The question is  
> whether any exist with this form-factor that are also quiet from an RF  
> perspective.
> 
> Anyone know of such a unit?
> 
> 73,
> Wayne
> N6KR
> 
> 
> 
> __
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_
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Re: [Elecraft] Looking for miniature 14-V power supply for travel use

[Wayne Burdick]

Can't roll our own in time for my vacation :)

Wayne
N6KR

On Jul 4, 2011, at 2:39 PM, Rick Dettinger wrote:

> Well, Chief Engineer Wayne, sounds to me like a good idea for a mini  
> kit !
>
> 73,
> Rick Dettinger   K7MW
>
>
>
>
> On Jul 4, 2011, at 2:23 PM, Wayne Burdick wrote:
>
>> I'm going to take a KX3 with me on vacation this summer, and I like  
>> to
>> travel light. I'll have internal batteries for field operation, but
>> for indoor use, I'm hoping to find a miniature power supply that  
>> meets
>> these criteria:
>>
>> - very small (say 4 x 3 x 1 inches)
>> - light weight (less than 1 lb)
>> - 2 A min. peak output current
>> - 13 to 14 VDC output voltage
>> - input AC voltage range of 100-130 V
>> - low noise
>>
>> I'm sure it will have to be a switching supply. The question is
>> whether any exist with this form-factor that are also quiet from an  
>> RF
>> perspective.
>>
>> Anyone know of such a unit?
>>
>> 73,
>> Wayne
>> N6KR
>>
>>
>>
>> __
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Re: [Elecraft] Looking for miniature 14-V power supply for travel use

[Wayne Burdick]

Yes, the HPS-1a is a great supply. But it's about twice the size and  
weight I'm looking for.

A "wall wart" supply would be fine as long as it meets all of the  
criteria and is well-regulated.

Wayne
N6KR


On Jul 4, 2011, at 2:27 PM, Nick Garner wrote:

> I use one of these:
> http://www.gammaresearch.net/hps-1a.html
>
> 73,
> Nick
> N3WG
>
> On Jul 4, 2011 2:23 PM, "Wayne Burdick"  wrote:
> > I'm going to take a KX3 with me on vacation this summer, and I  
> like to
> > travel light. I'll have internal batteries for field operation, but
> > for indoor use, I'm hoping to find a miniature power supply that  
> meets
> > these criteria:
> >
> > - very small (say 4 x 3 x 1 inches)
> > - light weight (less than 1 lb)
> > - 2 A min. peak output current
> > - 13 to 14 VDC output voltage
> > - input AC voltage range of 100-130 V
> > - low noise
> >
> > I'm sure it will have to be a switching supply. The question is
> > whether any exist with this form-factor that are also quiet from  
> an RF
> > perspective.
> >
> > Anyone know of such a unit?
> >
> > 73,
> > Wayne
> > N6KR
> >
> >
> >
> > __
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Re: [Elecraft] Looking for miniature 14-V power supply for travel use

[Rick Dettinger]

Well, Chief Engineer Wayne, sounds to me like a good idea for a mini  
kit !

73,
Rick Dettinger   K7MW




On Jul 4, 2011, at 2:23 PM, Wayne Burdick wrote:

> I'm going to take a KX3 with me on vacation this summer, and I like to
> travel light. I'll have internal batteries for field operation, but
> for indoor use, I'm hoping to find a miniature power supply that meets
> these criteria:
>
> - very small (say 4 x 3 x 1 inches)
> - light weight (less than 1 lb)
> - 2 A min. peak output current
> - 13 to 14 VDC output voltage
> - input AC voltage range of 100-130 V
> - low noise
>
> I'm sure it will have to be a switching supply. The question is
> whether any exist with this form-factor that are also quiet from an RF
> perspective.
>
> Anyone know of such a unit?
>
> 73,
> Wayne
> N6KR
>
>
>
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Re: [Elecraft] Looking for miniature 14-V power supply for travel use

[Robert Friess]

Jameco has a lot of these.  Not sure how quiet, but they are cheap enough
that you could buy 2 or 3 and pick the best.

Bob, N6CM


On Mon, Jul 4, 2011 at 2:23 PM, Wayne Burdick  wrote:

> I'm going to take a KX3 with me on vacation this summer, and I like to
> travel light. I'll have internal batteries for field operation, but
> for indoor use, I'm hoping to find a miniature power supply that meets
> these criteria:
>
> - very small (say 4 x 3 x 1 inches)
> - light weight (less than 1 lb)
> - 2 A min. peak output current
> - 13 to 14 VDC output voltage
> - input AC voltage range of 100-130 V
> - low noise
>
> I'm sure it will have to be a switching supply. The question is
> whether any exist with this form-factor that are also quiet from an RF
> perspective.
>
> Anyone know of such a unit?
>
> 73,
> Wayne
> N6KR
>
>
>
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Re: [Elecraft] Looking for miniature 14-V power supply for travel use

[Nick Garner]

I use one of these:
http://www.gammaresearch.net/hps-1a.html

73,
Nick
N3WG
On Jul 4, 2011 2:23 PM, "Wayne Burdick"  wrote:
> I'm going to take a KX3 with me on vacation this summer, and I like to
> travel light. I'll have internal batteries for field operation, but
> for indoor use, I'm hoping to find a miniature power supply that meets
> these criteria:
>
> - very small (say 4 x 3 x 1 inches)
> - light weight (less than 1 lb)
> - 2 A min. peak output current
> - 13 to 14 VDC output voltage
> - input AC voltage range of 100-130 V
> - low noise
>
> I'm sure it will have to be a switching supply. The question is
> whether any exist with this form-factor that are also quiet from an RF
> perspective.
>
> Anyone know of such a unit?
>
> 73,
> Wayne
> N6KR
>
>
>
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[Elecraft] Looking for miniature 14-V power supply for travel use

[Wayne Burdick]

I'm going to take a KX3 with me on vacation this summer, and I like to  
travel light. I'll have internal batteries for field operation, but  
for indoor use, I'm hoping to find a miniature power supply that meets  
these criteria:

- very small (say 4 x 3 x 1 inches)
- light weight (less than 1 lb)
- 2 A min. peak output current
- 13 to 14 VDC output voltage
- input AC voltage range of 100-130 V
- low noise

I'm sure it will have to be a switching supply. The question is  
whether any exist with this form-factor that are also quiet from an RF  
perspective.

Anyone know of such a unit?

73,
Wayne
N6KR



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Re: [Elecraft] Zipper Noise and Birdies on 6M -- FIXED!

[n5ge]

1. Go to page 59 of your owner's manual.
2. Near the top you will find a section labeled "SIG RMV [T]" ([T] means you
must have CONFIG in Test mode).
3. Follow the instructions.

And it works...

73,
Tom
Amateur Radio Operator N5GE
ARRL Lifetime Member
QCWA Lifetime Member



On Mon, 4 Jul 2011 12:16:21 -0500, "Allen R. Brier"  wrote:

>I have a number of birdies on 6 and other bands and they sure are annoying.
>What's the best way to eliminate them? I am not using an external pre-amp.
>
>Allen N5XZ
>
[snip]

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Re: [Elecraft] Flying with K2

[Dana Roode]

Ron, thanks much for the explanation!  Sounds like a pretty safe battery to me.

 Dana - K6NR


On Mon, Jul 4, 2011 at 9:06 AM, Ron D'Eau Claire  wrote:
> Elecraft sells a Sealed Lead Acid (SLA) Gel Cell battery for the K2.
> Unfortunately, many people, even some battery vendors, are careless with the
> terminology.
>
> There are at least two types of Sealed Lead Acid (SLA) batteries: those in
> which the electrolyte is in a gelatin form (Gel Cell) and those in which the
> electrolyte is liquid but confined by an Absorbent Glass Mat (AGM). This
> latter type is often called a "Starved Electrolyte" battery.
>
> Unfortunately, many people fail to distinguish properly between an SLA AGM
> battery or an SLA Gel Cell battery and call both types "Gel Cell". It is
> true that neither will leak liquid acid, but they have quite different
> performance characteristics.
>
> SLA Gel Cells are superior for heavy demand and deep discharge situations
> since more electrolyte is available to support the chemical reactions, so
> they are the most popular no-maintenance, no-spill battery for powering Ham
> rigs.
>
> To further confuse the issue some liquid acid "no maintenance" batteries are
> referred to as SLA or Sealed Liquid (rather than Lead) Acid batteries. If
> punctured or otherwise damaged, these are capable of dumping liquid acid
> just like any earlier lead-acid battery. Like the older lead-acid batteries,
> they are properly classified as "flooded batteries". So, when seeing "SLA",
> it's good to know whether the L means Liquid or Lead.
>
> It's no wonder those in the transportation business are often skittish about
> shipping any kind of lead-acid battery. It's not always easy to identify
> exactly what it is by just looking at a label.
>
> Ron AC7AC
>
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[Elecraft] FS: Elecraft Special Edition HEXKEY

[corribkid]

FS: Elecraft Special Edition HEXKEY, s/n E0515. This beautiful key has high 
quality gold contacts, a high performance dual lever paddle and a magnetically 
tensioned precision chrome mechanism. The contact spacing and tension for each 
arm are individually adjustable, and its very heavy hexagonal base stays put. 
Bought new from Elecraft in March. Asking $160, delivered by USPS Priority 
Mail, CONUS only. Payment by USPS Money Order only. For more information please 
email me at corribkid at aol. Thanks, Paul, K1CM



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Re: [Elecraft] Zipper Noise and Birdies on 6M -- FIXED!

[John Ragle]

Allen...

 I have these same birdies (at least I suppose they're the same) and 
I suspect that all K3 have them. The most annoying ones are where the CW 
action usually occurs (50.09430, 20 dB above noise floor) and a number 
of minor ones around 50.098 (3-5 dB above the noise floor), as well as 
several major ones up where the SSB action occurs: 50.21050, 50.24055, 
etc. which are all 20+ dB above the noise floor. These are not 
"external" blips (not computer, not router, etc.) as they are present 
when nothing else is on, and they are present when the antenna is 
disconnected.

 I "treat" them by ignoring them. They are sharp, stable, and 
unmodulated. My ear can differentiate between them and real signals 
without any problem. They are "features" for "calibration.".. ;>) Every 
modern rig I have ever owned has had similar warts.

John Ragle -- W1ZI

=

On 7/4/2011 1:16 PM, Allen R. Brier wrote:
> I have a number of birdies on 6 and other bands and they sure are annoying.
> What's the best way to eliminate them? I am not using an external pre-amp.
>
> Allen N5XZ

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Re: [Elecraft] Zipper Noise and Birdies on 6M -- FIXED!

[Allen R. Brier]

I have a number of birdies on 6 and other bands and they sure are annoying.
What's the best way to eliminate them? I am not using an external pre-amp.

Allen N5XZ

ORIGNAL MESSAGE:
Message: 20
Date: Sun, 03 Jul 2011 15:32:21 -0700
From: Jim Brown 
Subject: [Elecraft] Zipper Noise and Birdies on 6M -- FIXED!
To: Reflector Elecraft 
Message-ID: <4e10edf5.6050...@audiosystemsgroup.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

Ever since I started using my K3 on 6M I've been troubled with zipper 
noise as I tune, as well as birdies generated within the K3 that move 
around as I tune.  Today I found and eliminated the coupling mechanism, 
and the noise and birdies are gone.

My setup uses an external ARR 6M preamp at the RXOUT / RXIN patch point. 
(I use it rather than the Elecraft preamp because I already owned it, 
and it's a very good preamp). I also have a switch that brings in my 
Beverages,  with a Tee jumper between the AUX input (for the SUB RX) and 
the RXIN.  That Tee was the coupling path. On a hunch, I replaced the 
Tee with a Mini-Circuits passive splitter that has about 35dB of 
isolation between outputs, with an insertion loss of 6.6 dB.  It's rated 
for use between 10 MHz and 1 GHz, but it passes my Beverages on 160M 
just fine.

Mini-Circuits is an old line, well respected company based in Brooklyn. 
I've been specifying their splitters for about 30 years for the VHF and 
UHF wireless mic systems I designed for performance facilities and 
churches.  The splitter I used with the K3 is a ZFSC-4-175 that is one 
of several I picked up at a hamfest.  While it's a 75 ohm splitter, it 
works just fine in this application.  It's a 4x1 splitter, and a 2x1 
would work equally well.  For optimum isolation, unused outputs should 
be terminated in 75 ohms, and I did that.

http://www.minicircuits.com/pdfs/ZFSC-4-175.pdf

http://www.minicircuits.com/pdfs/ZFSC-2-1+.pdf

El cheapo CATV splitters MAY also work -- IF they have enough isolation.

73, Jim Brown K9YC

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Re: [Elecraft] P3, no IF display

[Roger Banks]

*FOUND THE PROBLEM.*During factory build the coax cable to the IF Out board
from the main board has been trapped between the edge of the IF Out PCB and
the metal side panel.. the gap is sufficiently small that it has crushed
the coax and shorted it out...
Ho hum.
I think it has happened because of also having the 2M module AND freq lock
board. This adds extra cables in this point and they were assembled with
slightly the wrong routing - I have moved them around now and just need a
new cable to complete the job - this one works but intermittently.
Thanks for the help and advice everyone..
73
Roger-GW4WND

--
View this message in context: 
http://elecraft.365791.n2.nabble.com/P3-no-IF-display-tp6546250p6546726.html
Sent from the Elecraft mailing list archive at Nabble.com.
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[Elecraft] P3 and own spectrum display

[Ramon Tristani]

Something interesting happens sometimes right after taking a snapshot of the 
incoming spectral display with the P3 Utility. If I keep transmitting, my own 
signal displays on the screen. Unfortunately I can not reproduce this effect 
all the time. So I wonder if this is a "bug" and if Elecraft can incorporate 
this "bug" in the next firmware revision as being able to monitor one's own 
transmission is something that I find very useful.
Ramon Tristani
kp4ge

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Re: [Elecraft] Flying with K2

[Ron D'Eau Claire]

Elecraft sells a Sealed Lead Acid (SLA) Gel Cell battery for the K2.
Unfortunately, many people, even some battery vendors, are careless with the
terminology. 

There are at least two types of Sealed Lead Acid (SLA) batteries: those in
which the electrolyte is in a gelatin form (Gel Cell) and those in which the
electrolyte is liquid but confined by an Absorbent Glass Mat (AGM). This
latter type is often called a "Starved Electrolyte" battery.  

Unfortunately, many people fail to distinguish properly between an SLA AGM
battery or an SLA Gel Cell battery and call both types "Gel Cell". It is
true that neither will leak liquid acid, but they have quite different
performance characteristics. 

SLA Gel Cells are superior for heavy demand and deep discharge situations
since more electrolyte is available to support the chemical reactions, so
they are the most popular no-maintenance, no-spill battery for powering Ham
rigs.

To further confuse the issue some liquid acid "no maintenance" batteries are
referred to as SLA or Sealed Liquid (rather than Lead) Acid batteries. If
punctured or otherwise damaged, these are capable of dumping liquid acid
just like any earlier lead-acid battery. Like the older lead-acid batteries,
they are properly classified as "flooded batteries". So, when seeing "SLA",
it's good to know whether the L means Liquid or Lead. 

It's no wonder those in the transportation business are often skittish about
shipping any kind of lead-acid battery. It's not always easy to identify
exactly what it is by just looking at a label. 

Ron AC7AC

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Re: [Elecraft] P3, no IF display

[Greg]

BTW that was the menu on the P3, not the K3.


On 7/4/2011 7:03 AM, Roger Banks wrote:
> Ok - here's one
> New P3. K3 1 month old. Both factory built with internal 2m module, KXV3A
> etc.
> I have no IF display at all on the P3 on any band at any scale level.
> Tried rescaling, everything on P3. I have changed IF lead.
> If I put a freq counter on the IF out socket from the K3 I get nothing - is
> this right?
> Can it be switched on and off by the K3 software? I cannot see mention of
> this anywhere.
> RS232 works and displays freq on P3 OK. DSP widths are showing - everything
> by IF signal data.
> Any thoughts please?
> Roger
> GW4WND
>
>
>
> --
> View this message in context: 
> http://elecraft.365791.n2.nabble.com/P3-no-IF-display-tp6546250p6546250.html
> Sent from the Elecraft mailing list archive at Nabble.com.
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Re: [Elecraft] P3, no IF display

[Greg]

GM Roger.

Did you try the IF menu in setup?  If you don't select K3 it won't 
work.  Also, that is where you must select the IF value if you want to 
use other radios.

Also triple check the cable.

73
Greg
AB7R


On 7/4/2011 7:03 AM, Roger Banks wrote:
> Ok - here's one
> New P3. K3 1 month old. Both factory built with internal 2m module, KXV3A
> etc.
> I have no IF display at all on the P3 on any band at any scale level.
> Tried rescaling, everything on P3. I have changed IF lead.
> If I put a freq counter on the IF out socket from the K3 I get nothing - is
> this right?
> Can it be switched on and off by the K3 software? I cannot see mention of
> this anywhere.
> RS232 works and displays freq on P3 OK. DSP widths are showing - everything
> by IF signal data.
> Any thoughts please?
> Roger
> GW4WND
>
>
>
> --
> View this message in context: 
> http://elecraft.365791.n2.nabble.com/P3-no-IF-display-tp6546250p6546250.html
> Sent from the Elecraft mailing list archive at Nabble.com.
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Re: [Elecraft] [P3] Beta 1.08 bug?

[Jim McDonald]

Understood!  Thanks, Mike.

I could and should use that mode for split-frequency pileups, and I tried on
a "foreign" mode, PSK.

Jim N7US



-Original Message-

Hi Jim,

I'm using 1.09 but I believe this will also apply to 1.08. If VFO A is on
the left side of the screen then you must be in Fixed-Tune mode. In that
mode, the left frequency display shows the lower frequency limit. The right
display shows the upper frequency limit. The center display shows the K3
frequency. So if the K3 frequency happens to also be 14070.0 then the center
display will be the same as the left display. If you move VFO A you will see
the center display change while the left and right displays remain fixed.

73,
Mike K2MK


N7US wrote:
> 
> I was experimenting with moving the VFO A frequency to the left side of
> the
> display for PSK (a mode I don't normally use) and think I found a bug.
> 
> I set the span to 4 kHz, and the left side of the display shows the
> correct
> VFO A frequency, 14070.0, and the right side correctly shows 14074.0, but
> the center shows 14070.0 instead of 14072.2.
> 
> I saved a screenshot of the display with P3 Utility in case anyone wants
> to
> see it.
> 
> Jim N7US


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Re: [Elecraft] P3 RS232

[Don Wilhelm]

  Roger,

Tune lower - the K3 IF center is at 8215 kHz.  Make certain your P3 is 
also set to the K3 center frequency.

73,
Don W3FPR

On 7/4/2011 11:13 AM, Roger Banks wrote:
> I can find an output from the K3 with the R20 at about 8.580. If I set a user
> if to that and plug the P3 in then I get a display with a couple of peaks at
> -105db . However, it is not the main IF output as you can tune off it and
> nothing else is visible.
> The P3 will show the random noise floor at -165dB using scale.
> Roger
>
> --
> View this message in context: 
> http://elecraft.365791.n2.nabble.com/P3-RS232-tp6545130p6546481.html
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Re: [Elecraft] P3, no IF display

[Don Wilhelm]

  Roger,

I am confused - your prior post said that you could not easily get to 
the IF out jack on the K3.
I would guess that means you removed the cable from the P3 and connected 
it to your IC-R20.
That still leaves the cable high on the suspect list.

The K144XV IF out is at 28 MHz and is connected to the receiver front 
end - that has nothing to do with the IF output jack on the K3.

73,
Don W3FPR

On 7/4/2011 11:04 AM, Roger Banks wrote:
> I also have had a back BNC lead but sorted this.
> If I connect my IC-R20 to the IF Out, tune to 8.8Mhz I hear nothing at
> all...
>
>
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Re: [Elecraft] P3 RS232

[Roger Banks]

I can find an output from the K3 with the R20 at about 8.580. If I set a user
if to that and plug the P3 in then I get a display with a couple of peaks at
-105db . However, it is not the main IF output as you can tune off it and
nothing else is visible.
The P3 will show the random noise floor at -165dB using scale.
Roger

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Re: [Elecraft] P3, no IF display

[Roger Banks]

I also have had a back BNC lead but sorted this.
If I connect my IC-R20 to the IF Out, tune to 8.8Mhz I hear nothing at
all...

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Re: [Elecraft] P3, no IF display

[Roger Banks]

OK- thanks for all the input on this on and off this forum.
Some are saying that it may be a loose/missing cable.
I have the 2M module in. Does this not modify the routing as there is an IF
in and out on the module?
I cannot get to the back of the IF out board without a serious amount of
dismantling here.
Roger

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Re: [Elecraft] P3, no IF display

[Don Wilhelm]

  Roger,

The level from the K3 IF out jack is quite low - about what you would 
expect from an antenna.
So you will need something more sensitive that a 'scope of frequency 
meter to find anything.
Connect to a separate receiver that can tune to the K3 IF near 8.8 MHz 
to see if you can hear any signals.
As Jim Brown pointed out, a common problem is a bad BNC cable - try a 
known good one.

73,
Don W3FPR

On 7/4/2011 10:03 AM, Roger Banks wrote:
> Ok - here's one
> New P3. K3 1 month old. Both factory built with internal 2m module, KXV3A
> etc.
> I have no IF display at all on the P3 on any band at any scale level.
> Tried rescaling, everything on P3. I have changed IF lead.
> If I put a freq counter on the IF out socket from the K3 I get nothing - is
> this right?
> Can it be switched on and off by the K3 software? I cannot see mention of
> this anywhere.
> RS232 works and displays freq on P3 OK. DSP widths are showing - everything
> by IF signal data.
> Any thoughts please?
> Roger
> GW4WND
>
>
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[Elecraft] FS: AA908 Antenna Analyzer

[Don Wines]

For sale:

AA-908 Antenna Analyzer by the American QRP Club (N2APB, N2CX).
Includes the HC908 Daughtercard, AF DSP Daughtercard by KK7P,
and the DDS60 60MHz Daughtercard. The latest versions of software
are loaded. (AA908 v6.0g, AF908 v1.2d) Also included is the internal 
battery holder, calibration loads, test loads for 40, 30 and 20 meters
and printed versions of the operating manual, technical reference
manual, construction manual and related literature.

 $160 shipped via USPS Priority Mail anywhere in the US. 

This unit is fully assembled, works great and is in excellent condition.
The power jack is cracked but does not affect operation of the unit.
(See photos)
I built it several years ago with the anticipation of promised 
additional
software and options being available that never materialized. Most of 
the 
software available is open source so if you are a programmer you can
play with it or write you own.
 
For pictures of the actual unit being offered see:


http://www.flickr.com/photos/43690708@N02/sets/72157627105696882/

For additional description, technical info and available software see:

http://midnightdesignsolutions.com/micro908/index.html

Thanks for the bandwidth and if interested please respond off list.

Don,
K5DW
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Re: [Elecraft] P3, no IF display

[Jim Brown]

On 7/4/2011 7:03 AM, Roger Banks wrote:
> I have changed IF lead.

One of my two P3s came with a bad BNC cable.  Use an ohmmeter to check 
it for an open or short.

I would not expect a freq counter to read anything at the IF.  Have you 
tried a scope?  Do you have a radio that can tune to 8.8 MHz?  If so, 
try connecting it to the IF output of your K3 so see what you hear.

73, Jim K9YC
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Re: [Elecraft] P3 RS232

[Bill Coleman]

Hi Pete,   Check the RS232 speed settings in the P3.

The P3 forces (and leaves) the K3 at 38400 baud.  If you have the P3 set to 
something other than 38400 then your software is likely set to that (say 
19200).  With the P3 'out of the picture', your software at 19200 is trying 
to 'talk' to the K3 set at 38400.

Simple fix:  set the P3 and your software to 38400.

As an independent verification, use the K3 utility with and without the P3 - 
it will work fine.  It manages to handle the speed mismatch because it tries 
all four possible speeds.

73, Bill  N2BC


-Original Message- 
From: Peter Chamalian
Sent: Monday, July 04, 2011 9:46 AM
To: 'Roger Banks' ; elecraft@mailman.qth.net
Subject: Re: [Elecraft] P3 RS232

Yes, it does that on mine too.  I'm using a microHAM Station Master and if I
turn off the P3, the band data goes away.  The fix here is to turn the P3 on
then power off and on the radio.

Pete, W1RM


-Original Message-
From: Roger Banks [mailto:ro...@dio.co]
Sent: Monday, July 04, 2011 2:58 AM
To: elecraft@mailman.qth.net
Subject: [Elecraft] P3 RS232

I have noticed that if I turn my P3 off the RS232 out link to the PC also
stops.
Is this correct?
Roger
GW4WND

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[Elecraft] P3, no IF display

[Roger Banks]

Ok - here's one
New P3. K3 1 month old. Both factory built with internal 2m module, KXV3A
etc.
I have no IF display at all on the P3 on any band at any scale level.
Tried rescaling, everything on P3. I have changed IF lead. 
If I put a freq counter on the IF out socket from the K3 I get nothing - is
this right?
Can it be switched on and off by the K3 software? I cannot see mention of
this anywhere.
RS232 works and displays freq on P3 OK. DSP widths are showing - everything
by IF signal data.
Any thoughts please?
Roger
GW4WND



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Re: [Elecraft] P3 RS232

[Peter Chamalian]

Yes, it does that on mine too.  I'm using a microHAM Station Master and if I
turn off the P3, the band data goes away.  The fix here is to turn the P3 on
then power off and on the radio.

Pete, W1RM


-Original Message-
From: Roger Banks [mailto:ro...@dio.co] 
Sent: Monday, July 04, 2011 2:58 AM
To: elecraft@mailman.qth.net
Subject: [Elecraft] P3 RS232

I have noticed that if I turn my P3 off the RS232 out link to the PC also
stops.
Is this correct?
Roger
GW4WND

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Re: [Elecraft] [P3] Beta 1.08 bug?

[Mike K2MK]

Hi Jim,

I'm using 1.09 but I believe this will also apply to 1.08. If VFO A is on
the left side of the screen then you must be in Fixed-Tune mode. In that
mode, the left frequency display shows the lower frequency limit. The right
display shows the upper frequency limit. The center display shows the K3
frequency. So if the K3 frequency happens to also be 14070.0 then the center
display will be the same as the left display. If you move VFO A you will see
the center display change while the left and right displays remain fixed.

73,
Mike K2MK


N7US wrote:
> 
> I was experimenting with moving the VFO A frequency to the left side of
> the
> display for PSK (a mode I don't normally use) and think I found a bug.
> 
> I set the span to 4 kHz, and the left side of the display shows the
> correct
> VFO A frequency, 14070.0, and the right side correctly shows 14074.0, but
> the center shows 14070.0 instead of 14072.2.
> 
> I saved a screenshot of the display with P3 Utility in case anyone wants
> to
> see it.
> 
> Jim N7US
> 


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Re: [Elecraft] Flying with K2

[Dave Sergeant]

Gel-Cell is an informal name for a SLA (Sealed Lead Acid) battery. They 
are one and the same thing.

73 Dave G3YMC

On 4 Jul 2011 at 2:04, Dana Roode wrote:

> Folks, I've read this thread with concerns about the SLA battery in the
> K2.  However, the Elecraft web site says the K2 batter is a Gel-Cell,
> not Sealed Liquid Acid.  Does this make a difference? Were some K2
> batteries SLA and some Gel-cell?
> 


http://www.davesergeant.com

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Re: [Elecraft] Flying with K2

[Dana Roode]

Folks, I've read this thread with concerns about the SLA battery in
the K2.  However, the Elecraft web site says the K2 batter is a
Gel-Cell, not Sealed Liquid Acid.  Does this make a difference? Were
some K2 batteries SLA and some Gel-cell?

  Dana


On Sat, Jun 25, 2011 at 10:21 AM, David Andrews  wrote:
> Advice please - I'm flying within Europe shortly with a K2. Do I pack it in
> suitcase (hold) or carry-on? Any problem with the SLA battery? What about
> paperwork? Is it likely to cause concern at the airports?
>
>
>
> Thanks
>
>
>
> David G4CWB
>
>
>
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[Elecraft] Photos of elecraft booth at Dayton 2011

[Johnny Siu]

Hello Group,
 
I am going to give a short presentation to local radio clubs about my visit to 
Dayton 2011.  
 
I now reckon that I took few photos of elecraft booth.  If you have any photos 
taken in Dayton at elecraft booth showing their products such as KPA500, K3 and 
P3, would you mind sharing a few with me and hams in Hong Kong?  No need to 
send me photos of KX3 of which I had plenty.
 
Please reply off-the-list and thank you in advance.
 

TNX & 73,


Johnny VR2XMC
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