John This subject comes up frequently. A bullet through the middle of the screen is the solution. Plasma TVs and screens radiate from the screen. There is no fix for the problem except to destroy the
Roger I spent time at Loring AFB working ECM on B-52s. Late 70s, following a hot humid tour in Thailand. Winter was typically -20 deg with wind chills down to -65 and one night down to -109 deg. Flig
1:2 or 2:1 ??? SWR with 50 ohm load and 75 ohm feeder the SWR is likely to be 75/50 = 1.5:1 AT RESONANCE point of the antenna. Once you deviate from the resonant point, it is no longer a 50 ohm resis
Most SS amps, at least my Tokyo HyPower amp, shut down when SWR get to a point where 80 watts is reflected back into the amp. Does not matter what the SWR is. It matters how much power comes back dow
Jim I have an MFJ-998 Autotuner connected to the amp. Every time I change frequency I mouse click on the TUNE button on the screen, generate a carrier and the tuner does it's thing. So, do I have dis
Tom, the tuner does not fool me. I know exactly what it does. It presents a 50 ohm impedance to my transmitter. My antennas are resonant at one frequency per band, and of course deviate from resonanc
Doug, I agree. When talking about mismatches, power losses, SWR and such, keep in mind that I and many other people operate both QRO and QRP. I am quite certain that most of us have some line loss du
Patrick I second Tim's advice. I built my own low band vertical using 23 ft of tower and stinger above it. But it is not the same as HyTower. HyTower also has an insulator at the top of the tower to
Patrick Caveat: Do this at your own risk. And by the way, I did not use a Rohn Tower. I used some other kind of tower that I managed to get free from another ham. This tower has a smaller diameter an
Patrick, Also, ignore the 40 meter stub on the PDF drawing. I shortened that to a 30 meter stub since I decided to use the entire antenna on 40 as a half wave antenna. Best Regards Dan Schaaf == K3ZX
Now, all you need to worry about is a lightning strike. Hopefully your preamps short the input to ground when powered down. And a fuse resistor of about 22 ohms 1/8 watts in series between the antenn
Here is my hinged vertical for 40, 60, 80, 160 meters http://k3zxl.com/Tower_Vertical/ Best Regards Dan Schaaf == K3ZXL www.k3zxl.com == NOBSKA www.nobska.net Cape Cod Instruments www.gnm-inc.com Tel
Hello all, I am looking for a 50 ohm somewhat rigid cable copper clad aluminum that will fit into PL259 connectors. I have been told that DLC213 is such a cable but I cannot fins a source for it on t
I have a friend who did the same thing but used a charged car battery. Best Regards Dan Schaaf == K3ZXL www.k3zxl.com == I picked up a 2500 lb. rated 12V. winch from Harbor Freight intending to use i
I had a 989C and it worked great until I tried to load an 80 meter G5RV on 160 to work VP6DX. I made the contact but the roller inductor warped due to the loss in the tuner in the form of heat. Just
Tony Their catalog has the roller inductor listed as a spare part item. My catalog says average price is $60.00 and that depends on which one you are buying. It pays to treat that roller with TLC. Be
Lowering Property Tax is a good thing. Best Regards Dan Schaaf I may be lost, but I'm making good time.... == K3ZXL www.k3zxl.com == I recently took out a building permit to erect a 72' crankup tower
I installed a 6 BTV with 45 radials and needed to adjust the 15 meter trap calibration. Was easy according to DXE instructions. I found it's performance to be quite good compared to my HyGain AV-640
I always use the DXE VFCC Choke. To my knowledge, It has been quite effective. Well worth the dollars spent. Best Regards Dan Schaaf == K3ZXL www.k3zxl.com == I have a discussion of the 43 ft vertica