[TenTec] (no subject)

[kf6e at mail.com]

I thought about a relay to switch an impedance matching transformer in and out, or a couple of relays to change the physical length of the random wire.  Never got around to it.  I finally replaced the random wire with a set of dipoles, which work much better.
 

 73,
Frank
KF6E


 

 

-----Original Message-----
From: Dr. Gerald N. Johnson <geraldj at weather.net>
To: tentec at contesting.com
Sent: Fri, Nov 26, 2010 10:37 am
Subject: Re: [TenTec] (no subject)






On 11/26/2010 7:17 AM, kf6e at mail.com wrote:

> The problem was that I had a random wire antenna in my attic and

> wanted to use it on several bands.  The impedance was low on one band

> and quite high on others.  A transformer to change the impedance seen

> by the rig would only have worked on one band.



Certainly, but it was only needed on one band. Might have needed a 

switch or relay to switch it into the circuit for that band.



(I calculated the

> initial length of the wire as follows:  I started in one corner of

> the attic, and when I got too tired to go on, I stopped and cut the

> wire.)  I subsequently tried adding some length in small increments,

> and improved the loading somewhat, but never got it very good.  I

> replaced it with several center-fed dipoles, which not only load

> better, but perform better both on receive and transmit.

>

>

> Moral of the story: don't buy a house where outdoor antennas are not

> allowed, no matter how much the XYL insists.

>

>

> By the way, the LDG AT-600 Pro is for sale, since I now use a Ten Tec

> Centurion amp with the MFJ-998.

>

>

> 73, Frank KF6E

>

>

>

73, Jerry, K0CQ

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