I don't think that you can do much better than if you regard the output of the pi network of an amp as a low pass filter. It is not resonant at the harmonic frequency and acts just as a low pass filt
As noted in my post; that is why I stated "with a pi network output". 73 Gary K4FMX _______________________________________________ _______________________________________________ TowerTalk mailing
Rick, Why would the pattern be any worse off resonance on the TH6 than on the TH7? Thanks Gary K4FMX _______________________________________________ _______________________________________________ To
What is the link to the FAA web site? I seem to have missed that. I have a similar situation, right at 3 miles from the end of the runway and about 70 feet above them. Towair says that I can go 97 fe
Thanks Dick. What do you put in the last part of the form where it asks for frequency and power? Thanks Gary K4FMX _______________________________________________ ____________________________________
For erp shouldn't you add antenna gain also, or are they not concerned so much about power? Thanks Gary K4FMX _______________________________________________ _________________________________________
When I checked Towair calculated the airport from the end of the runway closest to me. I looked up my lat/lon on google earth, plugged that into Towair and it gave me the distance from my qth to the
I too agree that PL type connectors are fine at HF. Speaking of junk connectors; I used the MFJ 259B to try and measure a new dummy load up thru 2 meters. A PL to N adaptor was used at the MFJ as the
You are right Bill, no HF data at all. It pays to understand what you are reading. As I said in an earlier post, using UHF to N adaptors can also cause problems with mismatch. A lot of those adaptors
If you think about your example of the two ground peaks at different heights, what would the shadow of the larger one have to do with direction? If the receive path has the small peak in the shadow o
Actually, Polyphaser recommended against putting loops in the coax line. The thought was that a loop would greatly increase the field and act as an antenna that would increase the chances of induced
Running a conductor from the ground pin of the outlets to the SPG will accomplish little. The equipment should already be connected to the SPG panel with a heavy conductor. The ground pin of the outl
No need to relocate anything. Just run all cables to a common (single) point (including AC power) that is very near your ground system. Then feed the shack with everything from there. See my previous
First, you should probably learn what a "single point ground system" is as it is referenced to in the discussion of lightning protection for radio equipment. It is NOT the service entrance panel. It
I would stay a few feet away from the house. The ground right near the foundation is dryer than it is out away from the house. Where the rain drips off the roof may not be a bad place as it gets more
Don't get too hung up on a perimeter ground ring. That is good if you have things outside at various places that need to be tied into the ground system. It also equalizes the ground currents flowing
Many are confused by the SPG term as they try to envision it as how they would tie their ground system together. The "single point ground" (SPG) really refers to the bonding of the equipment that you
You can have up to a 2:1 mismatch (SWR) at the transmitter using 75 ohm line if the antenna is a flat 50 ohms. If your 75 ohm line happens to be a multiple of a quarter wave length that will transfor
Why bother flattening it? It has the same surface area when it is left round. 73 Gary K4FMX _______________________________________________ _______________________________________________ TowerTalk m
Hi Bill, Lightning doesn't really care what shape the conductor is as long as it has a low impedance. Round works just as well as flat for a given amount of surface area. The reason that copper stra