Using an MFJ-269 analyzer this can be done relatively easy. Just check the
user manual.
73, Bill, WF4R
----- Original Message -----
From: "Paul N1BUG" <paul_n1bug@verizon.net>
To: <vhfcontesting@contesting.com>
Sent: Saturday, July 22, 2006 6:34 PM
Subject: Re: [VHFcontesting] impedance transformer
> Ed,
>
> Since you have already run the lines and probably cut them to some
> preferred length, you may not want to do this. But for what it's
> worth I don't bother with the matching sections any more. If you cut
> the line to a multiple of a half wavelength (which must be done
> experimentally unless you have access to some fancy test equipment)
> it will repeat the impedance of the load. 50 ohm antenna, CATV line
> cut to a multiple of a half wavelength = 50 ohms at the shack end of
> the line.
>
> 73,
> Paul N1BUG
>
>
>
> Ed Stallman wrote:
>> Hello Group, I ran two length of 3/4 inch 75 ohm CATV cable 200 foot each
>> to my newly installed tower. one each for 6 and 2M ! What I'm looking
>> for
>> is an impedance transformer to match my radio/antenna, I believe a 62 ohm
>> transformer. I remember seeing these somewhere made from copper water
>> pipe,
>> I think they were 1/4 WL? I've searched on the internet with no luck!
>> can
>> someone point me in the right direction with a URL or publication, ARRL
>> VHF
>> book. even the formula would be helpful for knowing the outside and
>> inside
>> diameter of the tubing.
>>
>> Thanks Ed N5BLZ
> _______________________________________________
> VHFcontesting mailing list
> VHFcontesting@contesting.com
> http://lists.contesting.com/mailman/listinfo/vhfcontesting
>
>
> --
> No virus found in this incoming message.
> Checked by AVG Free Edition.
> Version: 7.1.394 / Virus Database: 268.10.3/395 - Release Date: 7/21/2006
>
>
_______________________________________________
VHFcontesting mailing list
VHFcontesting@contesting.com
http://lists.contesting.com/mailman/listinfo/vhfcontesting
|