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
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
I found that a good method is to use the MFJ259/269 as an RF source driving a 50 ohm pad in parallel with the open stub under test using a T-connector. I connect the output of the pad to a spectrum a
lines, but if it good method that I coax or leave it Watch the MFJ manuals. A few years ago someone rewrote the manuals for antenna analyzers and messed up DTF procedures. They may have also messed
In the network analyzer calibration world, it's considered that it's much easier to make a good short than a good open. The problem is the fields at the end of the open are less well controlled. For
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 make
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
Coaxial cable delay lines for phasing HF antennas are really not all that critical, at least for peaking the signal, but if you are trying to precisely position a null then better accuracy is require
correct is when one sharp, much less than whether you want multiple stubs. I had a few complaints about a very weak 40M harmonic when working 80. It was well within FCC level limits, but of course e