[Moon-Net] Which 432 Mhz feed for a 4.5M dish in combo with 23cm Septum feed
Edward R Cole
kl7uw at acsalaska.net
Tue Nov 29 18:02:33 CET 2016
Back when I was still considering running
dual-band 432/1296, I was thinking to duplicate VK3UM's dish feed:
I am using a W2IMU feed on 1296 same as Doug so
his was a good design for me even though my 4.9m
dish is half the size of his. I suspect you can
use using a septum feed for 1296 in the center of
a dual-dipole, dual-pol 432 feed.
You would not have the ideal polarity matching of
a rotable 432 feed, but one could use a dual-pol
receiver like the IQ+ to do adaptive-pol on Rx.
That was the direction I was considering. But
concerns of the extra feed blockage for operating
1296 plus expense of adding a custom-built
dual-Rx transverter ($800+), two preamps/relay
matrix ($400-500), and 1kW amplifier ($1200+)
plus the feed dissuaded me from doing 432, so
just installed the 1296 W2IMU horn.
73, Ed - KL7UW
At 07:25 AM 11/29/2016, ON4AOI_PDA wrote:
>Hi dish gurus ,
>After lot of reading , vk3um-sm6fhz-ok1dfc-kl6m
>to name a few I dont know what will be the best choice anymore.
>I have a 4.5M (15ft) dish F/d = 0.45
>(unassembled) from RFHAMDESIGN since January
>waiting to get on a lift crane system ( NEKO 400A)
>First intention was for 23cm only with a septum
but my 4 x 38 elem M2 on 432Mhz are a big pain in the
>When its dry they work FB even for single yagi
>stations like TO2EME - PJ7/PE1L - E44CM but asap
>that it rains or even when humidity gets high
>SWR goes up dramatically and kicks out my AMP.
>I am for now the only ON qrv on 432Mhz but limited to weather conditions.
>Depending on the specs from the 4.5M dish the
>gain will be equal to the 4 stack except that I
>will have the benefit of switching H-V ,
>With a motor even all in between.
>Will it be possible (with min of losses) to have
>both 23cm (septum feed ) and 70cm mounted together ?
>If YES what feed do I need to build or buy for 70cm to have both H and V
>If NO what will be my best option for a 4.5M - F/d = 0.45 dish ?
>73 Guy ON4AOI OT7K
>Moon-Net posting and subscription instructions
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73, Ed - KL7UW
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