Thanks Grant, I worked with Greg, '8WWV, for quite a bit of the modeling - he would run my models using NEC4 ... and although he'd get a slight shift in frequency his results were similar to mine tha
now this is where I get a bit frustrated ... MY experience in modeling height change is that it doesn't reliably predict it! I am using NEC2 (although models checked have been re-checked courtesy of
AH HA! Ok - so there is a difference between a dipole and a yagi. Great to know! And if indeed that new model re a yagi shows similar results that would be quite encouraging. My apologies if I missed
Ok... so here is my situation. I will have 6/6 on 15 with the top at 90. I will have the 40M4LLDD at 124 so just 34 above it (a good distance for stacking on 15!) I had asked for others with this ant
Hi Grant - my numbers were as found on a recently calibrated (by Larry) LP100 as well as the rig as well as the SPE 2K. All agree quite closely. I've not seen any irregularities here using the SARK s
If some are seeing an SWR much closer to 1:1 ... then there WILL be interaction guaranteed. Is it hurting anything? Was that rhetorical? I ask because although I've done quite well in range testing t
Sorry Jim - you've misunderstood where I am going .... I'm using SWR as a 'worst offender" indicator. I am not at all worried about SWR, or at least not in it as a single indicator - but in all the m
I had planned on using 1/2 thimbles to couple 5/16 EHS to 5/16 EHS (pieces I have from a purchase) ... as well as at their ends of course ... and the same for coupling from the 11200 philly to the 5/
the Optibeam is designed NOT to be resonant... funny how that works. One would think ALL antennas, if there is that likelihood, would be designed as such or at least an optional kit. Especially since
Thanks Jim.... re the factors you mention: the antenna is 34' away, about 2/3 wave at 15 meters so quite close enough and an oft used stacking distance, it is in the same plane as the 15 ... and re t
Jim, But as noted before I can't get a model to work! Therein lies the issue. If I could get a model to do something close to reality I'd feel considerably more comfortable - I've heard several say t
Ok ... so the plan is to have 6/6 on 15M at 90/45 and Im worried about (the unknown) interaction from a 4 el 40 mounted 34 above the top 15. One option I have is to simply rotate the 40M 90 degrees a
Thanks Jim, Yes - a rotating tower so all antennas are fixed to the tower yes - the Optibeam and the F12 as well as the JK are all designed to play nice with a 15... M2 not so much. The 80 is already
I have a used K0XG rotating tower system... so I dont have info on how install this thing.... Im mechanically inclined but am curious how one grounds the tower with one of these!? I had a RTS system
An FYI for those interested. Note this is ONLY about an M2 40M4LLDD. There are other 40 antennas that are/were intentionally designed not to have an interaction issue with 15 meters. JK, Optibeam, (s
this is the one that is about 76 long with 26 t bars... mine is somewhere in all these boxes after so many moves ... emailed pdf would be more than fine if someone has one and can scan and email it.
I bought 120 of R55 used ... it came with 2 sets of guys both 5/16 ... all preassembled using 1/2 thimbles and big grips at one end and 1/2 thimbles and clamps at the other ... Their individual lengt
I have a few sections from a used yagi purchase that are like this - a few of them I managed to get apart with lots of effort using a screw driver in an existing hole and lots of pulling ... the rest
generally I find its not only corrosion but metal bits from holes that weren't cleaned on the inside (how would one do that!?) ... THEY put the breaks on BIG time... the one I did manage to separate
THAT was the stuff - PB Blaster... let it sit for DAYS ... nothing - nada. Tried WD-40 just for SnG's, and yes I'm aware its water displacement but it also does work in some lubrication cases - works