Dear friends Radio Hams, Of all this talk about emergency etc. Cell phones are good but they need to be charged too and if there is no power ... The governor 'forgot" to declare emergency when we had
It appears as you have a case of intermodulation?generated in?a semiconducting junction somewhere. You obviously have a couple of strong AM stations close by. Did?this started recently or have you ha
The diodes in ULN2003 are there to protect the switchers in the IC from too high voltage when connected to relay coils etc. It works well provided the "other end" of the diodes are terminated correct
Can anyone give me an advice what do use for anti-climbing device at my tower. I am required to have that in order to put up my tower. A small fence is of no use as it is too easy to climb and a larg
How about the water tight AMU boxes available for around $5 - 10 in surplus stores? They are available in all sizes from rifle amu to mortar amu. N2JFS In a message dated 2/10/2009 12:40:32 A.M. East
What I remember RG6 is a 53 Ohm cable very similar to RG59 N2JFS _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@conte
Apart from why you are using CPVC for your antenna I don't think you will have any problem with static discharges as long as you make sure the antenna is grounded somewhere. (Had that problem once wi
Hi there, Wasn't there a way with "bazooka" antenna to get a wider bandwidth of any antenna? I will remember that you could use a parallel resonator to extend the bandwidth on any antenna. An other w
Hi Guys, Water has a dielectric constant of around 80, high enough to reflect most anything, RF included. Beside getting a good ground (read low resistance) you also need a low loss surrounding to ge
Maybe you can place it somewhere where the rest of us that don't have a yahoo account can see it. 73 de N2JFS Hans I found my way to it! Wow! Just how tall ( and how many yagi's) was it? Bill-W4BSG -
I was told (second hand) around 1975 that the US army was making experiments with large toriod (ferrite) transformers what "wrapped" around trees. As I haven't heard anything about it after that I ca
The "spring coil" is a neat idea to couple RF into any other structure such as grounded towers, metal flag poles etc. Could be a fast way to get an antenna up-and-running in an emergency. N2JFS I saw
Remember something about it from ARRL handbook a couple (or so) years ago. Was made of three planks (2x8 should probably do). Two of them were clamped around the third. It looked like an "A" with a s
Hi, I used a rather large, 4" diameter, 12" long solenoid with two parallell windings as a common mode choke for the ladder line to my windom antenna. Worked OK for my purpose. Kept the RF out of the
I had a LW running though some tree branches. Found that it was impossible to get a stable SWR (Used a tuner to get the "right" impedance at the trx end). Only after removing the offending tree and h
Hi Brad, The good thing is that possibly the gear will not allow the tower?for a?fast "down-launch". The sad thing is that the gear gets "better" (easier to drive) as it?gets used so even if it works
Hi Tim, Personally I think you should leave the oxidation alone as long as it doesn't block anything or make it impossible to assemble the tower. You always have a oxide layer on aluminum. That's wha
I had a similar story: My house in Vermont was hit by lightning and burnt down to ground. When rebuilding the house, lightning protection was discussed (of course). The result; I have built the prote
Isn't the discussion really what a good antenna system is all about? To my knowledge it is important to get as much power in the radiating part as possible or have as little losses as possible in the
How said the ladder line can't be equipped with a bal/un choke. I made one by winding two wires next to each other on a 4" PVC pipe. I had some 25 feet of wires and basically made a 1/1 transformer.