[NLRS] 10ghz offset dish feed

Tue Jul 18 10:57:27 EDT 2023

Thanks all!

On 7/18/2023 2:06 AM, Zack Widup wrote:
> I don't think it matters if it's conductive or not. If you're not 
> going to use the 24 GHz part, the 10 GHz section will not be affected 
> by the 24 GHz section. When I got some WR-42 to SMA transitions, they 
> came with plastic covers. I would just put one of those over it if I'm 
> not going to use it on 24 GHz.
>
> 73, Zack W9SZ
>
> On Tue, Jul 18, 2023 at 1:16 AM Mary Brown <maryalanab at gmail.com> wrote:
>
>     Ordered the W1GHZ dual band feed, question on the 24ghz waveguide
>     port,
>     since it will sit unused cover it with a conductive plate or just
>     some
>     plastic to keep critters out?
>
>
>     Mary
>
>     W0AAT
>
>     On 7/14/2023 6:59 AM, Gary wrote:
>     > Hi Mary,
>     >
>     > Not sure what you got, but Q5 doesn't sell 10 G transverters. Do
>     you
>     > mean DownEastMicrowave? If so $500 is a good price.
>     >
>     > One way to feed the dish is to use the feed that came with it. You
>     > will need to increase the inner diameter of the feed to more the
>     > 0.75". Check KØAWU's web site for info on how he modified the
>     original
>     > dish feed. Add an SMA with the correct length probe, spaced the
>     > correct distance from the back short. Then you can use the original
>     > cover for the feed to weather proof it. The other option is to
>     follow
>     > the W1GHZ dimensions for a type M copper water pipe and build an
>     > extension of the LNB that fits on the back after having removed the
>     > PCB. It is possible to design a rectangular feed horn using the
>     > hdl-ant program by W1GHZ and build it out of brass sheet. In
>     this case
>     > you will need a SMA or N transition to wave guide. Again W1GHZ
>     > dimensions work great. I have build a few, all with better then
>     25 dB
>     > return loss. Home brew feed horns are what many of us are using.
>     >
>     > Another option is the W1GHZ dual band feed, 10 G and 24 G. He
>     made and
>     > sold the some time ago. I am sending you a link to the group
>     that is
>     > currently making them. I think it's K2UA selling them with the
>     > machining being done by another microwave ham who is a commercial
>     > machinist.
>     >
>     > Please keep in mind that this feed may not be the best for the dish
>     > that you are going to use. See the W1GHZ Antenna Book for more info.
>     >
>     > You will want some elevation ability in addition to azimuth for
>     rain
>     > scatter.
>     >
>     > Feel free to ask any questions you may have on the NLRS
>     reflector. To
>     > get in contact with those of us who are on 10 G in the upper
>     Midwest
>     > area you can join the 10ghzcontest reflector at Chris.org. That is
>     > where most of the local 10 G discussions take place.
>     >
>     > Local 10 G contest activity often takes place in the following
>     general
>     > areas: SE MN and NE Iowa-Spring Grove to Oelwein, IA. Then on
>     Sunday
>     > back north along US63; Central Iowa-starting north of Ames and
>     > traveling either East or West on Saturday and then back in the
>     > opposite direction on Sunday; Western MN-starting near
>     Montevideo then
>     > traveling west into SD and south. Ending the day in Pipestone. On
>     > Sunday traveling back NW up the Buffalo ridge before turn back
>     to the
>     > east on the way home; the Red River Valley north and south of
>     Fargo.
>     > This can give you some idea of where you could be able to turn the
>     > dish to work people.
>     >
>     > I hope this helps you get on the air on 10 G. It's a fun band.
>     >
>     > 73, Gary WBØLJC
>     >
>     >
>     > On 7/14/23 2:18 AM, Mary Brown wrote:
>     >> Are there any sellers in the USA for an offset dish feed?  I do
>     not
>     >> have the test equipment to tune one(looking into what I can
>     get...).
>     >> Will be used terrestrial at first but eventually I will pick up a
>     >> second one for EME on my 1.2 meter offset dish. EME is a ways out,
>     >> power amplifier is not in my budget right now. Lucked into a Q5
>     >> transverter for $500 and snapped it up! 3 watt version... plan on
>     >> using a DirecTV dish in the center of my 2m array, 18" isn't much
>     >> wider than the rotor/tower top so I don't see a lot of
>     interaction.
>     >> Preference is SMA or N connector instead of waveguide.
>     >>
>     >>
>     >> Mary
>     >>
>     >> W0AAT
>     >>
>     >> EN24ho
>     >>
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