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

Lars Pettersson sm4ive at telia.com
Tue Nov 29 20:50:44 CET 2016


Orginal description was K3BPP       re W2IMU and dual dipole

/Lars SM4IVE


Den 2016-11-29 kl. 20:16, skrev Barry Malowanchuk:
> dual dipoles for 432 with a concentric 1.2 WL W2IMU feed...think VK3UM 
> has written it up
>
> Barry VE4MA
>
> ------------------------------------------------------------------------
> *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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-- 
I dont do ESP QSO`s i prefere to hear the station.
CW is still King!!!!

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