[TowerTalk] [Bulk] tower spacing

Grant Saviers grants2 at pacbell.net
Sat Dec 5 16:13:40 EST 2015

I have three towers about 100' apart.  I don't think there is much 
interaction of the patterns, but haven't really looked for it. Perhaps a 
bigger hazard is QRO operation coupling into another receiver.  For a 
multi-multi contest I had a temp 6m 800w station and that blew the front 
end of another 756 Pro III on HF.  K3's are near bullet proof, one 
reason they are so popular for DXpeditions. Obviously the risk is the 
greatest when yagis are pointed at each other.

For VHF/UHF yagis it might be wise to avoid boom lengths that are 
resonant on HF.  That might be a bit hard to figure out however with the 
element loading.  Otherwise, I wouldn't expect much pattern impact 
either way HF<->VHF/UHF as close stacks of them are very common.

Good bandpass filters and stubs can prevent most of the overload and 
intermod problems.

Grant KZ1W

On 12/5/2015 12:24 PM, w5jmw at towerfarm.net wrote:
> I have a hdx 555 and a ndx 455.I will be using one for hf and the 
> other for vhf/uhf.My question is how close can they be to each other? 
> I realize they should be as far apart as possible buton a lot and for 
> the coax runs etc..what is a good distance? thanjks all w5jmw john
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