Hi. Several years ago, I, (for some bizarre reason) became rather obsessed with TDRs. I have 3 towers at my location with antennas from 160M through 70CM. I was able to accumulate a LOT of 1502 and 1503 TDRs, in addition to a bunch of Biddle, etc.
When I install a new antenna, I always make several runs with the HP TDR and it's printout.
I then store it and go back every year or so, to see if things have changed.
Yes, the batteries are NFG and the TD are problematic. However, through ePay, I have scored a bunch of NOS TDs from both HP and the Russian equivalent.
ron
N4UE
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-----Original Message-----
From: Tom Gardner <tggzzz@...>
To: TekScopes <
[email protected]>
Sent: Tue, Feb 27, 2018 6:59 pm
Subject: Re: [TekScopes] What can you do with a 1502?
On 27/02/18 21:57, Paul Amaranth wrote:
I pulled a 1502 TDR out of the buck a pound box at Dayton a few years back
and finally got it completely fixed the other week. I had to fab a
battery pack and then fix the charging circuitry, but otherwise it
was fine.
Turned out I had an immediate need for it to measure how much coax I
had left on a roll (answer: exactly enough to do a job). Pretty handy
getting an answer without having to string the cable or unrolling
the entire reel and finding out I'm a foot short.
Anyone have any neat applications for one of these, other than the
obvious ones of finding cable breaks and identifying where connectors are?
Not just breaks, any discontinuity. I've used it to diagnose a fault in a
relative's 75ohm TV antenna feed, where one multiplex couldn't be received.
There was a bad kink 4m into the cable, and the impedance change notch filtered
the multiplex's frequency.
Given the resolution, it can also be used to diagnose impedance variations on a
PCB; that's obviously not possible with the 1502B or 1502C.
Occasionally, since it my fastest scope by about decade, I'm tempted use it to
measure the risetime of my step generator. Obviously extreme care would be
needed to avoid damaging the TD, but I think it could be done.
And, shades of Dennis Tillman, vendors at hamfests are beginning to remember me :)
The 1502s are sweet little things.
