Make sure all Xc values are negative. Xl and R are positive numbers. Perhaps the concept should be "self resonance is over rated". We all spend a lot of time to achieve resonance more or less by adju
Phil, if the rotator is located at the first guy level, the pier pin base or concrete base is ok. In this case, you might consider using the six guy torq assembly at the first guy level to help absor
At onlinemetals.com 6061-T6 with 2.75 O.D. and .25" wall is listed for about $22 per ft. This diameter will require less machining to fit the i.d. of the 3" material. If the tolerances are out of pha
Mike, a simple L network will match a huge range of impedances. If you can characterize the R +-j at the end of your gamma no doubt you will be able match it with one of the four available L configur
Rick has the answer. Fishing the center conductor through the opening in the shield is easier if you provide a few inches of extra length and push the shield up the coax so it increases diameter a bi
Pete, the problem is there are no instructions for connecting coax to open wire.We were talking about fishing the center conductor through the braid to do the job. No connector involved at all in thi
Jim, Pasternack has N, HN, LC, SC and 7/16DIN connectors for RG218. Think of RG218 as a very heavy duty version of RG213/U. Due to the solid dielectric, it is a tad on the stiff side but at one time
A Google search for liquid tape thinner didn't turn up an immediate answer but did turn up a pdf from GC Electronics containing a spec sheet for liquid tape. In this spec sheet was a listing of compo
The GC-048 is the same as the supplied mast clamps with the Yaesu G2800SDX rotator. These clamps fit both the top and the bottom of the G2800SDX. 73, Gerald K5GW In a message dated 11/21/2009 7:19:43
Dick, the ohm meter test is d.c. only but it will detect a shorted or open cable. The loss has to be determined with real r.f.. Starting with say, 100 watts, how much power is present at the end? Com
Also, having a non-contaminating jacket is important for long life. Cheap CB type cables don't usually have a ncv jacket and the loss begins deteriorating the day it is installed and exposed to uv li
Joe, that is not quite correct. You can buy 6ft or 12ft tubing from Texas Towers and the price is the same per foot. 6 ft lengths can ship via UPS and 12 ft lengths can ship by truck freight for huge
Hi Jim and Pete, measuring the deflection of a mast is not the data that matters in wind survival. With a given diameter and wall thickness, the deflection will be about the same for all steel alloys
1/4 wavelength at the second harmonic is only 1/8 wavelength at the operating frequency. If you make the connection 1/4 wavelength away at the operating frequency, the described transformation does n
Hi Paul, I think you are confusing impedance and resistance here. There is an infinite number of resistance and reactance combinations that will equal 50 ohms impedance but the only ones with low vsw
Jim, you are right, it was a 200 ft length for 432 MHz and 100 ft for higher frequencies. This is a great application for old RG8 coax that has gone bad. 200ft of new RG213 measures right at 4.5 dB/1
You are exactly right Mike. Most of my measurements have been on 1296 MHz in recent years and that is where the 100ft cable is used. I use two 100ft cables for 432MHz, 73, Gerald K5GW In a message da
Hi Dan, they are still a stock item at Texas Towers. You can order by telephone at 800 272 3467 or via email at _sales@texastowers.com_ (mailto:sales@texastowers.com) . 73, Gerald K5GW In a message d
If I was an avid hf contester (I am not) and I thought 1 dB would make the difference between running and winning, and I had some extra $$ to blow, I would easily pay $1000 for a dB. 73, Gerald K5GW