Re: [Elecraft] Two Band Moxon/wire beam

[Charles Greene]

Stuart<

Thank you for the insight.  I calculated the % the wire lengths were 
off by % the frequency was off, and I also "moved" the model up in 
frequency (by shortening wire lengths in the model) by the amount it 
differed from the measurement.  In other words, the actual was about 
200 KHz below the model, so I moved the model up 200 KHz.  The model 
was at the same height as the measurements.  Both techniques produced 
results that were close.  One thing I found was to not change the 
wire spacing at the ends, but just to change the length of wires 
between the main supports.  I will wait until we hoist it to the 
final height which I estimate to be near 30' and take some more 
measurements then trim based on that.  I think we can operate with 
the existing lengths as the top band edge is within the 2:1 SWR 
bandwidth at 21'; it may be a little off at 30' as the resonant 
frequency goes down as the height is increased, but we don't have to 
operate near the top end of the band.  We have a LDG tuner, so it 
should be able to tune ok.  A comment on the vertical pattern.  For 
field day and special events the high angle of elevation of radiation 
on 40 meters you get at a height of 30' is not a disadvantage as we 
are looking for local contacts instead of DX.  About 90% of the US is 
in the horizontal beamwidth from RI.  Just northern New England and 
southern Florida is out side the 3 dB beamwidth.  It used to bother 
me that with a dipole 1/2 of the radiated power was going toward 
Europe, which really doesn't participate in field day.


Chas, W1CG

At 05:06 PM 9/26/2005, Stuart Rohre wrote:

Charles,
With dual band close spaced beams, everything interacts.

You can try adjusting the wire lengths by the percentage you were off your
target frequency, or just operate them as they fell.  They will vary with
height, and there is no compelling need to have them exactly resonant in
cases like this, as long as your are getting about the beam action you want.

Your SWR actual at 21 feet seem to be OK for operations.  Or just use a
tuner to touch up the match.

Stuart
K5KVH


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[Elecraft] KAT100-1 Problem

[Roy Morris]

When I first turn on my K2/100 the KAT100-1 works fine.  After it has been on 
for a while, the KAT100-1 refuses to retune to a new frequency at opposite ends 
of the band on 80 or 40 meters (for example).  There are no relay clicks and 
the SWR LEDs light up showing an out of resonance condition on the band being 
retuned.  The KAT100 memory works fine when scrolling through all the other 
bands where resonance was previously set. 
During this condition I went to the ATU menu and tried to edit AUTO.  Turning 
the VFO knob would display  PA ANT 1 only and then go back to AUTO.  Tapping 
ANT 1/2 shows NOT INST.  Also during this condition TUNE will not automatically 
go back to receive until TUNE is pushed again.
It seems to me I may have a microprocessor problem in the KAT100-1.  KAT MCU 
1.05 is installed.  When it works, it works well on all bands including 60 
meters.  I have checked for solder traces and resoldered all connections in the 
KAT100-1.  The K2/100 works fine into a manual antenna tuner.  Any suggestions 
would be appreciated.  Thanks Roy Morris  W4WFBNo virus found in this outgoing message.
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[Elecraft] WA3WSJ Summit Program Website Up!

[Edward R. Breneiser]

Hello all,

Check out the new WA3WSJ Summit Program Website. 
Take a look at the "VHF & Beyond" link for some nice band information.
Get out there and have some FUN!

http://www.wa3wsj.com/SummitProgram.html


72/73,
Ed, WA3WSJ


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[Elecraft] k2 agc

[Stokest977]

hi
 can anyone on the reflector advise  with this agc problem
have instaled new control board
volts setting with r1 no problem sets to 3.8
fast and slow positions work fine with s meter acting normaly
when i go to agc off audio goes dead bar on s metre goes full
scale
 volts checkes on controll board front panell removed
u1 and u2are all corect
 
any advise where to look
  thanks
   tom g0lne
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[Elecraft] K2 and FSK

[Sverre Holm]

I have read the postings on the problem of having to set the AF gain as
bands are changed with FSK and PSK31 modes, and I seem to recall that I have
seen a product that automates this.

I believe it was a hardware device that monitored the PSK31 output and
adjusted the AF level for optimum distortion level. It was independent of
the rig in use, and maybe it can be used for other digital modes like FSK
also - or that the idea can be adapted to other modes?

Does anyone have a clue or a web-pointer to what this is?



73

Sverre
LA3ZA
http://www.qslnet.de/la3za/
 

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Re: [Elecraft] K2 and FSK

[Lyle Johnson]

Hello Sverre!


I have read the postings on the problem of having to set the AF gain as
bands are changed with FSK and PSK31 modes, and I seem to recall that I have
seen a product that automates this...

Does anyone have a clue or a web-pointer to what this is?


PSK Meter, see 

73,

Lyle KK7P

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Re: [Elecraft] K2 and FSK

[John D'Ausilio]

that's the PSKMeter .. I have one but I don't remember who I bought it from :)

... Google sez http://www.ssiserver.com/info/pskmeter/

de w1rt/John

On 9/27/05, Sverre Holm <[EMAIL PROTECTED]> wrote:
> I have read the postings on the problem of having to set the AF gain as
> bands are changed with FSK and PSK31 modes, and I seem to recall that I have
> seen a product that automates this.
>
> I believe it was a hardware device that monitored the PSK31 output and
> adjusted the AF level for optimum distortion level. It was independent of
> the rig in use, and maybe it can be used for other digital modes like FSK
> also - or that the idea can be adapted to other modes?
>
> Does anyone have a clue or a web-pointer to what this is?
>
>
>
> 73
>
> Sverre
> LA3ZA
> http://www.qslnet.de/la3za/
>
>
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>
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Re: [Elecraft] K2 and FSK

[Brian Mury]

On Tue, 2005-09-27 at 18:30 +0200, Sverre Holm wrote:
> I have read the postings on the problem of having to set the AF gain as
> bands are changed with FSK and PSK31 modes, and I seem to recall that I have
> seen a product that automates this.

> Does anyone have a clue or a web-pointer to what this is?

http://www.ssiserver.com/info/pskmeter/
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[Elecraft] Recommended Solder (lead/tin) and where to buy

[Eric Swartz WA6HHQ - Elecraft]

We have added a new page to our builder's resource page with recommended 
lead content solders and where to buy them from a number of U.S. vendors.


Don't forget that we also have links for 'Ask Dr. solder', 'Recommended 
Solder Stations' and a 'Soldering Tutorial' on the Builder's page.


See: http://www.elecraft.com/Apps/K2info.html

I've copied the solder info below.

Thanks to Tom Hammond, N0SS, for compiling this list for us!

73, Eric and Wayne

-

The following vendors will carry the following lead-content solders as 
long as they are available for sale and use in the United States. (Which 
appears to be for the foreseeable future.) These solders are widely 
available and can be ordered via each distributor's web page or over the 
phone.


Note: All vendors shown below offer flux-cored solder wires with other 
flux chemistries and content. The products shown below have been tested 
and found suitable for assembly of Elecraft kits. Other flux types and 
chemistries may (or may not) be suitable, but have not been tested.



DigiKey   www.digikey.com  (800) 344-4539

 KESTER

   .015" Dia. (28 AWG)  63 Pb/37 Sn  1 lb roll

 DigiKey # Kester #   Description
 KE1203-ND #24-6337-9703  '285' RMA (Rosin, Mildly Active) 
Flux

 KE1405-ND #24-6337-8806  '245' No-Clean 1.1% Flux
 KE1110-ND #24-6337-0007  '44' RA (Rosin, Highly Active) 
3.3% Flux


   .020" Dia. (25 AWG)  63 Pb/37 Sn  1 lb roll

 DigiKey # Kester #   Description
 KE1201-ND #24-6337-9702  '285' RMA (Rosin, Mildly Active) 
Flux

 KE1401-ND #24-6337-8807  '245' No-Clean 1.1% Flux
 KE1409-ND #24-6337-8834  '245' No-Clean 2.2% Flux

   .025" Dia. (23 AWG)  63 Pb/37 Sn  1 lb roll

 DigiKey # Kester #   Description
 KE1202-ND #24-6337-9718  '285' RMA (Rosin, Mildly Active) 
Flux

 KE1404-ND #24-6337-8809  '245' No-Clean 1.1% Flux
 KE1109-ND #24-6337-0018  '44' RA (Rosin, Highly Active) 
3.3% Flux



Mouserwww.mouser.com  (800) 346-6873

 KESTER

   .015" Dia. (28 AWG)  63 Pb/37 Sn  1 lb roll

 Mouser #  Kester #   Description
 533-24-6337-9703  #24-6337-9703  '285' RMA (Rosin, Mildly Active) 
Flux

 533-24-6337-8806  #24-6337-8806  '245' No-Clean 1.1% Flux
 533-24-6337-07#24-6337-0007  '44' RA (Rosin, Highly Active) 
3.3% Flux


   .020" Dia. (25 AWG)  63 Pb/37 Sn  1 lb roll

 Mouser #  Kester #   Description
 533-24-6337-9702  #24-6337-9702  '285' RMA (Rosin, Mildly Active) 
Flux

 533-24-6337-8807  #24-6337-8807  '245' No-Clean 1.1% Flux
 533-24-6337-8834  #24-6337-8834  '245' No-Clean 2.2% Flux
 533-24-6337-0010  #24-6337-0010  '44' RA (Rosin, Highly Active) 
3.3% Flux


   .025" Dia. (23 AWG)  63 Pb/37 Sn  1 lb roll

 Mouser #  Kester #   Description
 533-24-6337-9718  #24-6337-9718  '285' RMA (Rosin, Mildly Active) 
Flux

 533-24-6337-8809  #24-6337-8809  '245' No-Clean 1.1% Flux
 533-24-6337-18#24-6337-0018  '44' RA (Rosin, Highly Active) 
3.3% Flux



Newarkwww.Newark.com  (800) 463-9275

 KESTER

   .015" Dia. (28 AWG)  63 Pb/37 Sn  1 lb roll

 Newark #  Kester #   Description
 34C5666   #24-6337-9703  '285' RMA (Rosin, Mildly Active) 
Flux

 34C5662   #24-6337-8806  '245' No-Clean 1.1% Flux
 34C5653   #24-6337-0007  '44' RA (Rosin, Highly Active) 
3.3% Flux


   .020" Dia. (25 AWG)  63 Pb/37 Sn  1 lb roll

 Newark #  Kester #   Description
 90B5872   #24-6337-9702  '285' RMA (Rosin, Mildly Active) 
Flux

 00Z1222   #24-6337-8807  '245' No-Clean 1.1% Flux
 34C5665   #24-6337-8834  '245' No-Clean 2.2% Flux
 93B8307   #24-6337-0010  '44' RA (Rosin, Highly Active) 
3.3% Flux


   .025" Dia. (23 AWG)  63 Pb/37 Sn  1 lb roll

 Newark #  Kester #   Description
 34C5667   #24-6337-9718  '285' RMA (Rosin, Mildly Active) 
Flux

 01C6854   #24-6337-8809  '245' No-Clean 1.1% Flux
 34C5654   #24-6337-0018  '44' RA (Rosin, Highly Active) 
3.3% Flux



 MULTICORE (previously Ersin Multicore)

   63 Pb/37 Sn  5-Core  370 Rosin Flux  1 lb roll

 Newark #  Multicore #Description
 72C1193   MM00979.022" (0.56 mm) Dia.

--

_..._

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Re: [Elecraft] Tenna Dipper Kit... a small solution !

[ron]

Johnny wrote:




The website for ordering or have any info is: http://4sqrp.com/kits/
td/td.htm


this web site is

FORBIDDEN!  (error 403)

goodness gracious, is there another site for this??

Ron wb1hga
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[Elecraft] Tenna Dipper kit url.

[Bart W0IIT]

The correct url is:

http://4sqrp.com/kits/td/td.htm

cu es 72, Bart


-- 
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Checked by AVG Anti-Virus.
Version: 7.0.344 / Virus Database: 267.11.7/112 - Release Date: 9/26/05

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[Elecraft] K1 or KX-1 ???

[Ray & Susan Albers]

Kevin writes,

The KX1 has great reports: heck I give them all the time during ECN.  They 
work quite well in the hands of the best (Ray, K2HYD and Rick, KL7CW 
please take a bow).  Seems like they can beat their way through pileups to 
get my attention ;)  I never truly believe them when they tell me 3 watts 
but it must be true. 

Thanks for the compliment, Kevin - keep it up and I'll lobby for promoting you 
from 5th to at least 4th class!

First time I saw a KX-1 it was still an unbuilt kit, but looked so cool I 
couldn't resist. (BTW I won't mention names to proect the guilty but the ham 
who showed me the kit still hasn't finished building it!). And I do get great 
results with simple wires (definitely get the built in tuner!) and an honest 3W 
with an external gel-cell.

The K1 has more band capabilities (and maybe more power while running on 
internal batteries?) but is a little bigger with all accessories. But, how 
about this: when you're car-camping or on a motor trip to visit friends and 
relatives, take the shoes off your K2 and bring it along. And then get a KX-1 
plus maybe a 2.3AH gel-cell (not very heavy) for the the hiking / backpacking 
trips. And THEN get a K-1 for backup!
73 Ray K2HYD

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RE: [Elecraft] Tenna Dipper Kit... a small solution !

[EricJ]

The last part of the URL just got wrapped:

 
http://4sqrp.com/kits/td/td.htm 

This one isn't FORBIDDEN, but you might get carded.

Eric
KE6US
www.ke6us.com

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of ron
Sent: Tuesday, September 27, 2005 10:28 AM
To: Johnny
Cc: Elecraft - Maling List Elecraft - Mailing List
Subject: Re: [Elecraft] Tenna Dipper Kit... a small solution !

Johnny wrote:



> The website for ordering or have any info is: http://4sqrp.com/kits/ 
> td/td.htm

this web site is

FORBIDDEN!  (error 403)

goodness gracious, is there another site for this??

Ron wb1hga
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Re: [Elecraft] Tenna Dipper kit url.

[ron]

Bart W0IIT wrote:

The correct url is:

http://4sqrp.com/kits/td/td.htm

cu es 72, Bart



it works !! (heh heh)

unlike Gary, I didn't retry after that "warning" label... I chickened 
out! (smile)


Ron wb1hga

BTW:
Neat project. Looks like it can save me outputs using that
instead
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Re: [Elecraft] K2 and FSK

[Mario Lorenz]

Am 27. Sep 2005, um 09:43:12 schrieb Lyle Johnson:
Hello Lyle,

> >I have read the postings on the problem of having to set the AF gain as
> >bands are changed with FSK and PSK31 modes, and I seem to recall that I 
> >have
> >seen a product that automates this...
> 
> PSK Meter, see 

Then, there is IMD Meter at http://kk7uq.hfradio.org/index.htm

Having one of these on my shopping list, but not yet decided which
one I should go for, I'd be interested in first-hand reports,
preferably from people who have tried both...

73s
Mario

-- 
Mario LorenzInternet:<[EMAIL PROTECTED]>
Ham Radio:   [EMAIL PROTECTED]
 "I hear that if you play the NT 4.0 CD backwards, you get a Satanic message!"
 "That's nothing. If you play it forward, it installs NT 4.0!"
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Re: [Elecraft] K1 or KX-1 ???

[Leigh L Klotz, Jr.]

Ray,
I use a 10-cell AA holder from Mouser.com ($2) with 2500mAH Energizer 
NiMH AA's ($10 for 4, you need 10). It fits right under the KX1 for when 
you need that "QRO" boost.  It weighs less, but it doesn't have the low 
self-discharge that the gel cells do, so you do have to recharge it 
frequently.

Leigh / WA5ZNU
On Tue, 27 Sep 2005 10:50 am, Ray Albers wrote:
then get a KX-1 plus maybe a 2.3AH gel-cell (not very heavy) for the 
the hiking / backpacking trips

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RE: [Elecraft] K2 and FSK

[Sverre Holm]

-Original Message-
that's the PSKMeter .. I have one but I don't remember who I bought it from
:)

... Google sez http://www.ssiserver.com/info/pskmeter/
--
Yes, that's the one, I got several responses, the first after 12 minutes!

For $39.35 the audio level is adjusted automatically as bands are changed.
But only for PSK31, not for FSK as far as I can tell, but maybe with some
other PC software it would work even for FSK?



73

Sverre
LA3ZA
http://www.qslnet.de/la3za/
 

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Re: [Elecraft] K2 and FSK

[Leigh L Klotz, Jr.]

I wrote a Linux program for the PSKMeter, and AA6E re-wrote it with a 
nice GUI, and I now use his.  KF6VSG's site has some presentations on 
what the firmware does, and what the PC software does, and I used those 
and some email exchanges with George to write the Linux version.


The firmware does a number of voltage samples of its ADC which is across 
the RF line, and returns the raw values.  The envelope values are all 
positive, so you look for a max, assume the min is the correct number of 
samples away and barrel-shift the data around and then look at that 1/4 
wave to see if it seems to have the right cosine shape, as determined by 
a Fourier decomposition into the first 10 or so harmonics.  (There is no 
need for an FFT because it is really just a single unit of data.)


I heard that the firmware now does PSK63, and I suppose it just samples 
twice as fast.


So, you can do anything that you can do with a very small nmber of 
envelope samples, all rectified to be positive.


Leigh / WA5ZNU

On Tue, 27 Sep 2005 1:14 pm, Sverre Holm wrote:

-Original Message-
that's the PSKMeter .. I have one but I don't remember who I bought it 
from

:)

... Google sez http://www.ssiserver.com/info/pskmeter/
--
Yes, that's the one, I got several responses, the first after 12 
minutes!


For $39.35 the audio level is adjusted automatically as bands are 
changed.
But only for PSK31, not for FSK as far as I can tell, but maybe with 
some

other PC software it would work even for FSK?



73

Sverre
LA3ZA
http://www.qslnet.de/la3za/


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[Elecraft] Maple Island 2005 - Story, Photos & Log.

[Martin Gillen]

Hi.

VA3QV and VA3SIE activated Maple Island (C.I.S.A
#ON277)
on Sunday 25th September.  We contacted 68 amateurs in
3 countries using QRP to the field equipment.  Our
website contains photographs, story and our log.

http://www.sunim.plus.com/maple/index.html

Thanks to anyone who contacted us, we had a real fun
day!!

Martin.
[EMAIL PROTECTED]



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Re: [Elecraft] Maple Island 2005 - Story, Photos & Log.

[n3drk]

Cool! Thanks for sharing that with the group. Nice pics, many contacts in 
the log, nice antenna info. Sure bet you guys had a fun time.

73s
john-n3drk


- Original Message - 
From: "Martin Gillen" <[EMAIL PROTECTED]>

To: 
Sent: Tuesday, September 27, 2005 6:55 PM
Subject: [Elecraft] Maple Island 2005 - Story, Photos & Log.



Hi.

VA3QV and VA3SIE activated Maple Island (C.I.S.A
#ON277)
on Sunday 25th September.  We contacted 68 amateurs in
3 countries using QRP to the field equipment.  Our
website contains photographs, story and our log.

http://www.sunim.plus.com/maple/index.html

Thanks to anyone who contacted us, we had a real fun
day!!

Martin.
[EMAIL PROTECTED]



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[Elecraft] Tenna Dipper, part II...

[JEAN-FRANCOIS MENARD]

Now That I have finished my basic Tenna Dipper Kit. I need to put it  
in an enclosure with a little bit bigger switches, buttons BUT,  
BUT... one thing


In this kit, if you need to know the frequency that the Tenna Dipper  
is, you could just listen to the CW tones, but you will not be able  
to know too easely at which frequency you are. very anoying... :-(


Why do not make an external connector on the K2 that is link to the  
frequency counter probe connector on the control panel. After you  
have selected the CAL FCTR function, connecting the Tenna Dipper  
External frequency test point to the K2... you will be able to use  
your K2 to display the actual frequency of this little antenna  
anylizer and now be able to use more easly the Tenna Dipper on  
many different frequencies instead of using it always at a pre- 
defined frequency, because it is too hard without proper external  
indication.


What an idea ??? Let me guess I will do it tomorrow !! I let  
you know "by picture" as soon as possible.


73

=
/¯\/¯\/¯\/¯\/¯\/¯\   JEAN-FRANCOIS MENARD
 V  A  2  V  Y  Z   [EMAIL PROTECTED]
\_/\_/\_/\_/\_/\_/

Elecraft K2 #4130
Elecraft KX1 #999

http://homepage.mac.com/jfmenard
=


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[Elecraft] D 104 mic with K2

[K9ut]

I would like to try the D 104 Mic. (crystal element )  in the K2 . I  
remember a circuit posted on the reflector on this , can anyone help ? 
 
 
 
 
 
 
 
 
 
 
 
 
 
   Thanks ,72, 73,
Jerry Uhte K9UT K2  #  1273
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RE: [Elecraft] Tenna Dipper, part II...

[W3FPR - Don Wilhelm]

Jean-Francios,

It is quite possible to use the internal counter (CAL FCTR) for external
measurement - just don't forget that the ground must be connected to the
Device Under Test too - the normal K2 counter probe does not connect the
ground at the probe end when measuring inside the K2 because the ground is
continuous inside the K2 - and external probe would need a ground (similar
to a 'scope probe ground).  I had had many thoughts about providing a
connector on the left side panel that would accept an external probe, but I
acquired an accurate frequency counter before I got around to implementing
that 'feature'.

73,
Don W3FPR

> -Original Message-
>
> Now That I have finished my basic Tenna Dipper Kit. I need to put it
> in an enclosure with a little bit bigger switches, buttons BUT,
> BUT... one thing
>
> In this kit, if you need to know the frequency that the Tenna Dipper
> is, you could just listen to the CW tones, but you will not be able
> to know too easely at which frequency you are. very anoying... :-(
>
> Why do not make an external connector on the K2 that is link to the
> frequency counter probe connector on the control panel. After you
> have selected the CAL FCTR function, connecting the Tenna Dipper
> External frequency test point to the K2... you will be able to use
> your K2 to display the actual frequency of this little antenna
> anylizer and now be able to use more easly the Tenna Dipper on
> many different frequencies instead of using it always at a pre-
> defined frequency, because it is too hard without proper external
> indication.
>
> What an idea ??? Let me guess I will do it tomorrow !! I let
> you know "by picture" as soon as possible.
>
> 73
>
--
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Checked by AVG Anti-Virus.
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Re: [Elecraft] Tenna Dipper Kit... a small solution !

[John R. Lonigro]

Johnny:

Go to www.4sqrp.com.  There you will find a link to their kits, which is 
www.4sqrp/kits/kits.htm.


73's,

John AA0VE

ron wrote:


Johnny wrote:




The website for ordering or have any info is: http://4sqrp.com/kits/
td/td.htm



this web site is

FORBIDDEN!  (error 403)

goodness gracious, is there another site for this??

Ron wb1hga
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RE: [Elecraft] D 104 mic with K2

[W3FPR - Don Wilhelm]

The D 104 mic (unamplified version) needs to look into a very high impedance
(50k ohms or greater).  That mic was developed in the days of vacuum tubes
with mic amplifier input inpedances in the 50k to 1 megohm range.

Modern transceivers present an impedance of something close ot 600 ohms at
the mic input jack, so to properly use a D 104 with modern transceivers, you
will need an amplifier stage - the gain can be low, but the input impedance
must be very high and the design output impedance should be in the vicinity
of 600 ohms.  A few circuits to do that have been published in QST over the
past 2 or 3 years.  Sorry, but I don't have a specific issue reference.

I took a different route with my D 104, I put a Heil HC-5 element in the D
104 head - it works FB, but the Heil elements need about 3 to 6 dB of gain
to properly drive the K2, so a preamp stage is still needed (or the KI6WX
increased gain mod of the KSB2 - which is what I use).

73,
Don W3FPR

> -Original Message-
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] Behalf Of [EMAIL PROTECTED]
> Sent: Tuesday, September 27, 2005 7:39 PM
> To: elecraft@mailman.qth.net
> Subject: [Elecraft] D 104 mic with K2
>
>
> I would like to try the D 104 Mic. (crystal element )  in the K2 . I
> remember a circuit posted on the reflector on this , can anyone help ?
>
>
>
>
>
>
>
>
>
>
>
>
>
>Thanks ,72, 73,
> Jerry Uhte K9UT K2  #  1273
> ___
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> Elecraft web page: http://www.elecraft.com
> --
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> Checked by AVG Anti-Virus.
> Version: 7.0.344 / Virus Database: 267.11.6/111 - Release Date: 9/23/2005
>
--
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Re: [Elecraft] Tenna Dipper, part II...

[Lambs, Dick & Judy]

I'd agree that the Tenna Dipper is a simple, inexpensive alternative  
to the antenna analyzer.  Another simple and inexpensive alternative  
is an antenna noise bridge of the type that uses the transceiver  
itself as the frequency determining element.  These gadgets are broad- 
banded so they cover the whole HF spectrum continuously.  Palomar  
Enginners, Heathkit, MFJ, and perhaps others made them.


Ten Tec sells one in kit form for $19:  See:

http://radio.tentec.com/kits/Accessory

I found another kit at :

http://www.qrpp-i.com/KA8MAV_NEQRP_NoiseBridgeKit_Review.htm

Dick, K0KK
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RE: [Elecraft] D 104 mic with K2

[Ron D'Eau Claire]

Don has it right,  but it depends upon how new the D-104 is. The versions
made the last 20 years or so, using the same D-104 high-impedance crystal
element we hooked to our tube transmitters half a century back, now has a
transistor amplifier/impedance matching unit in  the base. If your unit has
a base plate in the stand that takes a battery, you have one of the newer
units designed for modern rigs.

The schematic of the D-104 amplifier and a nice graph of what a great
communications  microphone frequency response curve looks like are at the
Astatic site: 
http://www.astatic.com/cb/d104.htm

It should be pretty simple to duplicate if you have one of the older mics.
Just about any NPN transistor can be used (2N, etc). 

Ron AC7AC 



-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of W3FPR - Don Wilhelm
Sent: Tuesday, September 27, 2005 5:13 PM
To: [EMAIL PROTECTED]; elecraft@mailman.qth.net
Subject: RE: [Elecraft] D 104 mic with K2 


The D 104 mic (unamplified version) needs to look into a very high impedance
(50k ohms or greater).  That mic was developed in the days of vacuum tubes
with mic amplifier input inpedances in the 50k to 1 megohm range.

Modern transceivers present an impedance of something close ot 600 ohms at
the mic input jack, so to properly use a D 104 with modern transceivers, you
will need an amplifier stage - the gain can be low, but the input impedance
must be very high and the design output impedance should be in the vicinity
of 600 ohms.  A few circuits to do that have been published in QST over the
past 2 or 3 years.  Sorry, but I don't have a specific issue reference.

I took a different route with my D 104, I put a Heil HC-5 element in the D
104 head - it works FB, but the Heil elements need about 3 to 6 dB of gain
to properly drive the K2, so a preamp stage is still needed (or the KI6WX
increased gain mod of the KSB2 - which is what I use).

73,
Don W3FPR

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Re: [Elecraft] Tenna Dipper, part II...

[dave]

Small Wonder Labs also has a noise bridge available, $17

< http://www.smallwonderlabs.com/noisebrg.htm >

73 de dave
ab9ca



Lambs, Dick & Judy wrote:


I found another kit at :

http://www.qrpp-i.com/KA8MAV_NEQRP_NoiseBridgeKit_Review.htm

Dick, K0KK


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[Elecraft] Loctite Multicore solder

[Joseph Trombino Jr]

Howdy Fellow Builders:

I was "googling" Loctite Multicore (formerly Ersin Multicore) and found a 
source to order from.


The source is RSHughes and the solder I ordered can be found at:

   http://rshughes.com/products/mm00979.html

I ordered two rolls of the .020" 63/37, Loctite (and RSHughes) number 
MM00979.


The solder is listed at $9.50 per 1lb roll..very reasonable given the 
price quotes I have seen on other vendor pages.


You need to go thru the on-line process of setting up an account first, then 
you can order what you want.


They will ship UPS ground and an office in Raleigh, NC will be sending it to 
me so I hope the shipping isn't too bad.


I have wanted to try this stuff for several years but finding a reasonable 
price has been a problem until today.


Just thought I'd pass along what I believe is a good deal.

   73, Joe W2KJ
   I QRP, therefore, I am
   North Carolina




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