A tuner working into a 5:1 mismatch would not improve the antenna and feed line loss anyway. A tuner is the wrong approach to compensate a bad antenna design. 73 Peter I have noticed several so calle
It will not work on two bands without a trap 73 Peter Barry's designs use a loading coil in each leg rather than a trap, and the coils are roughly at the point where the insulator would be for a half
Hi Gerald, Sure, a parallel LC circuit (trap) will do it but not a coil alone. Traps should not resonate on a frequency one wants to use anyway. 73 Peter _____ From: TexasRF@aol.com [mailto:TexasRF@a
Of course, a 40m delta loop, dipole or vertical works nicely on 15m 73 Peter There are good examples of antennas that work well on two bands without a trap. For example, the 2m / 70cm verticals, whic
In the meantime I learned that it indeed uses traps. And with a decent tuner any wire "works" 73 Peter As others have observed, that is simply false. _______________________________________________ _
It is: http://nrgkits.shopfactory.com/workshop/half_wave_dipole_aerial.htm http://www.g0ksc.co.uk/creatingabalun.html 73 Peter The use of an ODD electrical quarter-wave of coaxial cable as a BAL-UN i
The easiest way might be to tune it off resonance by connecting a capacitor across a part of the boom within reach. 73 Peter Thanks to our late December windstorms, I will soon have the opportunity t
I always solder PL259 plugs with my old Weller TCP 50W iron and never had any problem 73 Peter Because a Weller 100 watt gun usually melts the coax before the connector gets hot enough to work. I hav
When you make the guy wires about half a wavelength long it is possible to build a very effective vertikal array. I am in the process to do similar. My 160m vertical will be my shunt fed 44m high tow
My chokes are wound through 4.5" toroids #61 mix. My cable is 1/2" ultraflexible Cellflex. I do not use any wheather shielding either, so far no problem. The oldest choke is now for 4 years exposed t
Very effective patterns to NA/SA, JA/NA or JA/ZS at the same time will be made available by switching the 4 high stacks out of phase. 73 Peter, DJ7WW After studying this a little more, I do not think
With my just 2.5m height of the gin pole above the tower I inserted 6m long masts easily. I just added enough intermediate weight to the lower part of the mast to keep it vertical. 73 Peter The probl
I wound all my wideband transformers on ferrite, like beverage 9:1 transformers, stack match 2:1 transformers etc. I use powered iron cores in tuned circuits only. 73 Peter, DJ7WW 9:1 etc. )? What mi
We built a stack of similar duo banders 50m and 27m high at DR1D. 4 elements on 20 and 4 elements dual driven on 40m. Works extremely well, antennas are Optibeam OB4020 with 49 feet boom length. http
A solenoid winding made of coax is more effective then those 4 wraps. I use SCF12-50 Cellfex to wind my choke baluns. 30 turns on a pvc tube of 4-5" diameter do the trick (2000 ohms at 14MHz). 73 Pet
One turn is quoted by Fair-Rite with 190 ohms at 10MHz, 290 ohms at 25MHz 31 mix would not be my choice for a balun anyway, at least not with decent power. It´s curie temperature ist just over 130°C.
I used their table with the snap-its cores. The 2.4 inch 61 core is part number 5961003821. I use them for stack match transformers from time time or for small baluns wound with RG142. 13 turns of RG
No problem with winding that cable on a 4" pvc pipe. And that cable is cheaper for me then four Fair-Rite toroids. The 40m yagis feed point impedance is 28 ohms. For the transformation and balun I us
Yes, I am pretty confident that it works on 20m. 30µH give me 2638 ohms. On the feed line I measure no common mode current either. I am using such on a 20m KLM yagi now which I converted to OWA two w
Jim, did you ever try that as a balun on the feed point of a yagi with the power level RG393 is good for? 73 Peter Jim VE7RF _______________________________________________ __________________________