[UK-CONTEST] Guy insulators

[Ken]

No maths needed Derek!

The ARRL Antenna handbook says "remain clear of any HF amateur band 
resonance the longest unbroken length should be 10% less than a half 
wave (or multiple of) on the highest frequency" i.e.14ft. There's a 
table in Ch22-13 showing lengths of (ungrounded) guys to avoid 
resonance. If 24 MHz is ignored then it seems that 38ft. doesn't 
resonate on any of the other bands.

I saw a good demonstration of a resonant wire at the GPO Ongar HF 
transmitting station (now long since QRT) when a feeder post guy wire 
wasn't bonded to its ground post and was arcing in time with the CW 
transmission. (I bet that caused some TVI in the local vilage).

73...

Ken

G3LVP



On 05/09/2012 07:31, Derek Thom wrote:
> The 6 "original" HF bands are harmonically related so it was fairly 
> easy to determine a non-resonant length when breaking-up guys/stays 
> with insulators. Now that we have the so called WARC bands as well, is 
> there actually a length which is sufficiently non-harmonically related 
> to all the current 9 bands? Has anyone done the maths?
>
> Derek G3NKS
>
>
>
>