[MAMS] 47 GHz

[Zack Widup]

Yeah, it was more difficult to align than my 10 GHz dish (we used 10
GHz for initial alignment). I noticed that the dish I have, an Andrew
VHLP1-370 which is meant for use at 39 GHz, works fine on 47 GHz but
has several sidelobes on either side of the main lobe. Making sure I
had the main lobe was the hardest part.

73, Zack W9SZ


On Mon, Nov 13, 2017 at 10:14 AM, Dr. Gerald N. Johnson
<geraldj at netins.net> wrote:
> 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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