[NLRS] 10ghz offset dish feed

[Mary Brown]

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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