My Station Rig

Here is the Yaesu Ft-767GX.

This is a good old rig!  I have had a IC-746(original) with the DSP and I have a IC-706MKIIG in the mobile and the 767 is my favorite rig so far.

Antenna Issues

I was mowing the other day and caught the guy line holding the outer post of my dipole setup. The antennas started to whip and one of the 160m legs broke at the insulator. I have cut the 160m section from the center insulator and now only have a 75m dipole. I think I will build a 75m bazooka and replace the setup with that.

Double Bazooka

I have been looking at trying some different antennae. Field Day is coming up and I am working on some double bazooka antenna builds. This antenna has good bandwidth and is rather simple to build. Some designs claim coverage of the entire voice portion of a band without a tuner.

I have RG-6 to build them from and purchased some PVC conduit T enclosures that have the open panel on one side. I think this will allow me to put the SO-329 connector on them and solder inside the box. I am hoping it will allow me to solder inside and seal the feed point.

I cut down one of the outlets to be flush with the enclosure and mounted the SO-239 on it. I have PVC plugs with holes in them to pass the RG-6 through.

Now the math!

460/f-MHz=overall length of the antenna
325/f-MHz=length of 1/4wave shorted stub in center

What does all that mean? Well, the bazooka can be make in different ways. The one thing that stays constant is the coaxial 1/4 wave stub in the middle. I have seen the ends made of 450 ohm ladder line, 300 line, and good old wire like a dipole. I will be using one continuous piece of RG-6 from one end to the other with the center and outer shield shorted at the 1/4 wave point. Just remember to figure an electrical quarter wave using the velocity factor of the line used. The quarter wave shorted stub is where most of the broad banding of this antenna comes from. The use of balanced lines on the ends may add some broadening by changing the length to diameter ratio. The simple wire would likely not add much if any broadening.

The jacket and shield only are stripped back to allow connection to the feed. The center conductor and shield are shorted at the 1/4 point to create the broadband stub. The center conductor is one piece from one end to the other, do not cut it. The total length is found from the formula previously mentioned.


THIS IS A WORK IN PROGRESS.
PHOTOGRAPHS AND MORE INFO TO COME!

On The Air

I have been on the air more and on the computer less, so I haven't posted lately.  I have been active mostly on 75m and 40m.  I did run into a friend on 160m a few nights ago.  I was tuning across the band and heard "Otis", NN2E, and we had a QSO for a few minutes.  I was happy to see the half wave dipole still doing it's thing.

I did do a modification to an old D-104 mic.  I used an MRF 102 JFET to impedance match the element to the FT-767.  I have gotten good reports with it and everyone has said the audio is clean and clear.  I have also wired a Sure Beta Green BG 4.1 electret mic to the rig.  This mic has an internal preamp that operates on a AA battery, so I don't need a bias voltage from the rig.  I have also gotten good reports with it and I like it better than the D-104 because of the convenience of using a mic stand with a boom arm.  This allows me to keep the mic in a location that is good for audio and out of the way of the computer.

I am still debating weather or not to bring the amp to the new operating position.  I will have to run a 220vac circuit to the position and figure out where to put the thing.  Every night on 75m the static is getting closer to the summer time levels so I keep leaning toward putting the amp inline.

It is good to have the radio up and running again.

IARU Region 2 and Radio Club de Chile Request Amateurs to Keep Emergency Frequencies Clear

“We would appreciate if amateurs would leave free the frequencies used by RECNA, as well as the usual IARU Region 2 frequencies on in 20, 40, and 80 meters.”

3.738
3.750
7.050
7.100
14.200
14.350
21.200
21.350
28.300
28.500




Other Frequencies of interest may be:

14.300
18.160
21.360 

Getting back on the air...finally!

I have the FT-767GX up and running.  At first I only had an NVIS on 40m, but today I got the 75m/160m dipole repaired and some feedline ran to the operating position.  I have half wave dipoles for those bands. 

My brother-in-law, KB9TZU, just upgraded to general and put a bazooka on the air for 75m.  He has a 170kHz 1.5/1 bandwidth.  I think I need to build one or two of these.

Finally, a rig in the house again!

I finally have an HF rig back in the house.  I purchased an FT-767GX at the Collinsville, IL hamfest.  It seems to be a good rig, I am only on 40m at the moment, but will likely get more bands as the weather gets warmer and I can get out and work on things.  I have been getting very good audio reports and the receiver seems good, very quite.

I am using a NVIS antenna that is 7' above the ground with a reflector at ground level.  The antenna is 66', about a foot long, and flat topped on pvc pipe.  Look me up on MIDCARS at 7.258 LSB.