AB4UG

My new vanity call sign showed up in the FCC ULS database this morning!

Just in time for BarcampCHS.

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Working MFJ-208, I think

Put the MFJ-208 back together and tested it out with the antennas for my handheld.

I think it works. The LED light comes on when I turn the power on. I can hear a tone and static on my radio at about the same frequency as what’s indicated by the dial. The SWR meter moves when I change the frequency selector dial.

I’m not sure I’d use it for actually quantifying the SWR performance of an antenna. Maybe useful for quick checks of an antenna. I’ll need to find someone with a good working antenna analyzer that I could use to compare to this one.

MFJ-208 refurb project

An examination of the innards of the MFJ-208 antenna analyzer didn’t reveal any obvious problems other than the messed up variable plate capacitor.

Everything else inside looks pretty clean.

With a pair of needle nose pliers and some very gentle pressure, I was able to bend the plates of the variable capacitor back to where I thought they should be. Both plates are parallel to each other now and don’t hit each other when rotated.

Now I just need to put everything back together, add power and test it out.

MFJ-207 refurb project

Spent some time going over the innards of the MFJ-207 antenna analyzer I picked up and doing some research to figure out what kind of rotary switch I’ll need to replace the existing messed up one with. I think I’ve found the correct replacement switch (a Lorlin CK1025 rotary switch).

Everything else inside looks in decent shape as far as I can tell. I haven’t tried to test all the individual components yet. No leaky/bulgy capacitors or burn marks and all the soldered connections seem solid. Aside from the rotary switch I’m not seeing anything else wrong with it.

Now to go over the MFJ-208. I don’t know if I’ll be able to find a variable plate capacitor to replace the existing one, but I might be able to fix it up so that it works the way it should.

SoftRock SDR radio kits

The SoftRock SDR radio kits I ordered arrived in a little box yesterday. The SoftRock Lite II receiver and the SoftRock Ensemble RXTX kits I got both contain a lot of bits and pieces to put onto relatively small boards.

The SoftRock Lite II kit.

The SoftRock RXTX kit.

It will be a little while before I’m ready to tackle either of them. The receiver kit looks like it will be the easiest to start with. There are a few SMT components to put on, but not as many as the RXTX kit.