[Moon-Net] Which 432 Mhz feed for a 4.5M dish in combo with 23cm Septum feed

Barry Malowanchuk ve4ma at shaw.ca
Tue Nov 29 20:16:37 CET 2016


dual dipoles for 432 with a concentric 1.2 WL W2IMU feed...think VK3UM has written it up 


Barry VE4MA 

----- Original Message -----

From: "ON4AOI_PDA" <on4aoi_pda at skynet.be> 
To: moon-net at mailman.pe1itr.com 
Cc: moon-net at googlegroups.com 
Sent: Tuesday, November 29, 2016 10:25:41 AM 
Subject: [Moon-Net] Which 432 Mhz feed for a 4.5M dish in combo with 23cm Septum feed 



Hi dish guru’s , 

After lot of reading , vk3um-sm6fhz-ok1dfc-kl6m to name a few I don’t 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 feed ………… 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 








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