Re: [Elecraft] Nifty KX1 & Options Quick Reference

2022-07-04 Thread Lou Laderman via Elecraft 
The line is 3 deep already. Thanks to everyone who replied. Happy Fourth of July

On Jul 4, 2022, at 4:51 PM, Lou Laderman via Elecraft 
 wrote:

Shack cleaning uncovered an old "Nifty KX1 & Options Quick Reference Guide"
(the small one, 2-3/4" x 4"). $1.00 (mostly to cover shipping) via PayPal,
first "I'll take it via email to me direct" gets it. 



73, Lou W0FK

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Re: [Elecraft] Nifty KX1 & Options Quick Reference

2022-07-04 Thread Bob Cutter via Elecraft 
I’ll take it. 
7/, Bob KI0G


Sent from Yahoo Mail for iPhone


On Monday, July 4, 2022, 3:52 PM, Lou Laderman via Elecraft 
 wrote:

Shack cleaning uncovered an old "Nifty KX1 & Options Quick Reference Guide"
(the small one, 2-3/4" x 4"). $1.00 (mostly to cover shipping) via PayPal,
first "I'll take it via email to me direct" gets it. 

 

73, Lou W0FK

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[Elecraft] Nifty KX1 & Options Quick Reference

2022-07-04 Thread Lou Laderman via Elecraft 
Shack cleaning uncovered an old "Nifty KX1 & Options Quick Reference Guide"
(the small one, 2-3/4" x 4"). $1.00 (mostly to cover shipping) via PayPal,
first "I'll take it via email to me direct" gets it. 

 

73, Lou W0FK

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Re: [Elecraft] Using the Antenna Tuner in the XPA100

2022-07-04 Thread Fred Jensen 
Well, not really, Mike.  The magnitude of the impedance at the end of a 
wire can vary from low to very high [several thousand ohms] depending on 
its electrical length.  As David pointed out, the general Elecraft ATU 
design is an L-network using relays to combine various fixed values of 
inductance and capacitance.  I believe my KX1 had 64 possible 
combinations, the KAT2 has more, and the KAT3 has even more I think.  
While the ATU may not be able to directly match extremely high or low 
impedances, a simple transformer will usually get the value into a range 
that can be matched.  My end-fed WOOF has a transformer at the feed 
point ... don't know if it's 4:1 [16:1 Z ratio], or 9:1 [81:1 Z ratio], 
but the KAT3 and KAT2 both find matches in the 1.0:1 - 1.3:1 range on 
all bands.  It is located on the fence, about 10 ft from the shack 
entrance weatherhead, but is fed through 100 ft of RG-8 right now ... 
long story involving my wife. 😉  While I can get a match on 6 m and 
occasionally hear signals, no one has ever answered my calls.  10 - 160 
work fine.


I don't know what algorithm Elecraft uses to search for a match, it's 
probably proprietary, but I'd guess its based on some variant of a 
steepest descent design.  Before microprocessors, some hams used an 
analog ATU design, often in mobile installations.  A coupler sensed both 
the voltage and current in the feedline at the antenna and a phase 
comparator operated a motor driving a variable capacitor in an L-network 
to the zero phase difference point.  Small loops often use this design 
today.


73,

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


On 02/07/2022 23:13, Mister Mike wrote:

"The “automatic” antenna tuner is a completely new concept for me.  They 
appear to be designed to tune unbalanced coaxial feedlines and not an 
end-fed wire."





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Re: [Elecraft] Using the Antenna Tuner in the XPA100

2022-07-04 Thread David Woolley 
Being automatic doesn't constrain the network topology or 
implementation; you could add servos and a controller to the 180s-1. 
However, most typical automated tuners are L networks, and differ from 
the aircraft one described in using switched combinations of fixed 
inductors and fixed capacitors, which means they have a finite number of 
settings.  The Elecraft ones cover wide range of values (256 equally 
spaced inductance values and 256 equally spaced capacitance ones), but 
some built into other transceivers have a limited range.


In circumstances that require a load end capacitor, the Elecraft type 
design reverses the L network, rather than converting to a Pi topology.


All L (and Pi) networks, are designed to feed unbalanced loads fed 
against the same ground reference as at the transmitter output.  If 
possible, they should be at the antenna end of the feeder, so should not 
be driving a feeder themselves.


You don't need a tuner when driving a matched line and an unmatched line 
can present a very wide range of impedances.


Actually, looking at the circuit of the 180S-1, in 
, the 
transmitter side capacitor topology is a hybrid of a pure variable 
capacitor and the switched lumped capacitors that are used for all the 
capacitors in the Elecraft type designs, although they only provide for 
two fixed values, in addition to zero, from two switches (500 and 
1,000), whereas the Elecraft type design would give 500, 1,000, and 
1,500.  I guess capacitors were expensive.

--
David Woolley


On 02/07/2022 23:13, Mister Mike wrote:

The 180S-1 consists of an L network which is formed by a variable air-capacitor on the 
input, and a variable roller inductor as the series coil.  It is then possible to expand 
this network (by means of a jumper) with a vacuum capacitor on the output of the 
"PI", in cases where the tuning solution would call for this.  The vacuum 
variable capacitor can be either shunted on the output, or placed in series with the 
inductor. This configuration allows for virtually every kind of antenna to be tuned.

The “automatic” antenna tuner is a completely new concept for me.  They appear to 
be designed to tune unbalanced coaxial feedlines and not an end-fed wire.   I have 
one in my K3 but prefer to use the 180S-1 or my B&W VS1500A which is a 
“transmatch” based on the design by Doug DeMaw, W1CER/W1FB SK in the 1960s.



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