On 7/4/2020 9:21 AM, gjpurden@gmail.com wrote:
For those using uses short, umbrella wire loaded verticals, I've posted an
article on adding 80m to a 160m array. It can be viewed or downloaded at:
https://w6ayc.com/w6ayc-adding-80m-to-a-160m-receive-vertical/.
73 Joe W6AYC
At the top of page 2, 2:1 VSWR is given as the bandwidth criterion.
That is somewhat irrelevant for phased arrays. In that case, the
critical issue is to have phase (especially) and amplitude tracking
between elements in the array. It would be a lot easier to do that on 2
bands by simply using relays to select individual networks for each
band, that could be optimized for each band, without interaction between
the tuning adjustments. This would also allow having a different
series resistor for each band. The control voltage could run down the
center conductor of the feedline.
73
Rick N6RK
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