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

ON4AOI_PDA on4aoi_pda at skynet.be
Tue Nov 29 19:33:46 CET 2016

Hi dish guru's ,


Sorry but I forget to write that I have a 23cm Septum feed

Its only the 70cm part where I am lost at the moment hi


Btw depending on RFHAMDESIGN there is no need for a  choke ring on the
septum feed

Because the F/d = 0.45






From: moon-net-bounces at mailman.pe1itr.com
[mailto:moon-net-bounces at mailman.pe1itr.com] On Behalf Of ON4AOI_PDA
Sent: Tuesday, November 29, 2016 5:26 PM
To: moon-net at mailman.pe1itr.com
Cc: moon-net at googlegroups.com
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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