On Thu, Jul 14, 2005 at 07:45:53PM -0500, W0UN -- John Brosnahan wrote:
> At 10:10 AM 7/14/2005, Dino Darling wrote:
> >Hello John, how do you test your lines and what equipment do you use?
> >
> >I've experimented with the MFJ 259B for stubs and phasing lines, but if it
> >is critical, I'll order lines from M2. I'd sure like a good method that I
> >could employ myself. Also, do you short the end of the coax or leave it
> >open. The MFJ book lists both methods.
>
> I am spoiled ROTTEN! In the old days I used an HP-8405A Vector Voltmeter.
> But now I use an HP-4195 Spectrum/Network Analyzer. I can cut a tenth inch
> off and watch the null shift by a few KHz. It makes it TOO easy.
>
> There are lots of ways with Antenna Analyzers and Grid Dip Oscillators, but
> once you have the expensive gear you won't go back. ;-)
Ah memories! I used an 8405 to phase match the T/R modules and
transmission lines for the NASA ATS-1 satellite's VHF repeater about 40
years ago, after all other methods I had tried gave conflicting results.
We had ordered one for this purpose at Hughes Aircraft, but quick
delivery was impossible unless you had a military priority (the 8405 had
just been introduced), so the HP salesman let me borrow a demo model
over the weekend, which was all I needed to complete the job.
73, Bob N7XY
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