QRZ! Ham Radio 4/QRZ Ham Radio Callsign Database - Volume 4.iso/files/qrp/archives/current.txt/text0020.txt

Text File | 1994-11-27 | 4.3 KB | 108 lines

please cancel my subscription to the qrp-digest.  it's interesting
stuff but I just don't have time to read it.

thanks,

paul newland, ad7i

From [e-mail]  Tue Jul  5 21:11:52 1994
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Date: Tuesday, 5 July 1994 15:41 PT
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Subject: How much is a Tek 2213 scope wor
In-Reply-To: The letter of Tuesday, 5 July 1994 15:34 PT
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Kevin,

      In answer to the question 'how much is a TEK 2213 worth?' I picked one
up at the local ham-swap a year ago in nice shape with the probes and the
accessory bag on top for $100.00.  I think this is the bottom of the scale,
and is partially due to the fact that the A/B channel selection didn't work
due to a mechanical problem with a switch.  They are a nice small scope!

      Good luck with the negotiations,
                                      Bruce

                                      AA7AR/6  [e-mail]

From [e-mail]  Tue Jul  5 21:14:23 1994
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From: Gary M Diana <[e-mail]>
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Subject: antenna tuners, etc.
Date: Tue, 05 Jul 94 14:50:21 -0400
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Hello All -

   I have been reading the articles of late, which discuss antenna
tuners which handle balanced and unbalanced feedlines.  No mention
of the SuperTee Tuner yet... so here goes.

   I just built a SuperTee antenna tuner(1).  It has both balanced
and unbalanced interfaces to the feedline.  On the balanced input,
a trifilar wound balun is used.  When using a balanced feedline, the
tuner is "floated" above ground; when used with a  random wire or
unbalanced (coax) feedline, the "low" side input is jumpered to ground.
Any comments on this arrangement?

   The real reason for this post is my interest in better understanding
the losses incurred by using an antenna tuner.  I have some experiments
in mind:
    - measure RF energy in and out of the antenna tuner
    - measure field strength of signal, with and without tuner
    - measure receive signal strength
    - use a resonant antenna (requires no tuner) and observe field strength,
         receive strength.  Compare to non-resonant antenna.
What I am after here is accounting for the entire 1 watt I am putting
out of the transciever, and optimizing the system.  Operations to date with
(my) QRP equipment has been seat-of-the-pants, willy-nilly, and no attention
given to potential versus realized performance.

Anyone out there diverted time to tuner/feedline/antenna analysis and
willing to share the results?

73, gary n2jgu

From [e-mail]  Tue Jul  5 21:17:56 1994
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Date: Tue,  5 Jul 94 09:41:16 PDT
Reply-To: [e-mail] (Grover Cleveland)
From: [e-mail] (Grover Cleveland)
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To: Tom Kerns <[e-mail]>
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Subject: Re: More Old QRP Stories &c.
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Can you describe the tiny key? I don't receive SPRAT.
I did get one of the tiny keys from South Africa and it's perfect
(I say again PERFECT) for portable operation. It is interesting that
the same design appears in a photo of a "Maquis" radio set from WWII.

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  Grover Cleveland        Instructional Designer, The Grass Valley Group, Inc.
  Internet: [e-mail]     Radio: WT6P@KE6LW.#NOCAL.ca.us.na
  Voice: [phone]             DoD:7388             Fax: [phone]
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