[MAMS] 47 GHz

[Dr. Gerald N. Johnson]

Very good. Looks like the 1 foot dish at 47 Ghz has abaout 41 dB gain so 
a quarter mw works out to about 2.5 watts ERP. Unfortunately 1.5 degrees 
beamwidth for difficult aiming. Not everyone is consitently successful 
with the 5 degree beamwidth of the Ku band TV dish on 10 GHz. The 3 KW 
ERP sure helps distance on 10 GHz.

73, Jerry, K0CQ

On 11/13/2017 12:58 AM, Zack Widup wrote:
> Pete K9PW came down to my area on Saturday Nov. 11 to see how far we
> could work on 47 GHz. Pete is using the new DB6NT system that has a
> receive preamp and a power amp with about 100 mW output (I think). He
> has a 1 foot diameter dish and a horn antenna. His station is
> configured to use a baseball switch so that when one antenna is on
> transmit, the other is on receive and vice versa. That way he can
> rotate the setup 90 degrees to use the other antenna. I have a basic
> DB6NT harmonic mixer with no preamp or power amp. I estimate the power
> out is 150 - 250 uW. I also have a 1 foot diameter dish.
>
> We started out with me on a hill on a country road that stretched for
> some miles. We worked at 5, 10 and 15 km distances on SSB with Pete
> increasing distances from me along the road. At 5 km we were pinning
> each others' s-meters. Pete was still pinning my s-meter at 10 km and
> I think he was hearing me at 40 over 9 then. At 15 km he was 40 over 9
> at my end and and I think I was 20 over 9 at his end. These were all
> line-of-sight paths.
>
> Pete then drove to another hill which is line-of-sight from where I
> was. I was in EN60af and he was in EN50ue. It was about a 25 km path.
> I was copying him at least 20 over 9 from there and he was copying me
> 10 dB over 9. We made another QSO on SSB on that path.
>
> Things were going a lot better than we expected, so I moved to the
> hill I like to use for contesting in EN50rl. The EN50ue to EN50rl path
> is 40 km. This is the longest line-of-sight path that I know of
> anywhere in this area. I got set up there and, once we got the dishes
> aligned, I was copying him S9 and he was copying me S4 to S5. We
> worked on CW this time.
>
> This was far better than I expected and it made my day! I'd been
> wondering for a long time if a couple hundred microwatts could make
> that path.
>
> 73, Zack W9SZ
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