Hi lunatics :
Some years ago I acquired the 7289 amp in the attached pictures.
Now wanting to get more pwr. on 23cm, I pulled it out of my future
projects collection and remembered that the original project was dropped
since I had NO documentation or even a manufacturer name.
Anyone remember these ?
Craig, N8DJB/4
Les,
In late 80's -early 90's I put up about 50 dishes
for Sat-TV. Most were 10-foot mesh, a couple 12-foot.
Those accepted 3.5-inch ID black pipe (paint with
Rustoleum Paint if you don't want it to
rust). Since you need to use a smaller diameter
it would not hurt to use sched-80 black pipe to
ensure no bending under wind load. <I am
mounting my 1.8m dish on a ten-foot section of
Rohn-25 set in a 3x3x3 cube of concrete (with
tower bottom sunk into the concrete). I want the
dish support very rigid for use on 3cm-eme>
Since they were larger than your dish, I used
eight-foot long pipes set into 18-inch diameter
concrete forms set 3-4 feet deep. Commercial
name of the forms is "Sonotube". Easy to make
the hole with a clam-shell post hole digger by
hand. 18x48 inch hole is 12,215 cu-inch or 7
cu-ft (I figured about 1/3 cu-yard to be
safe). A few wheel barrows of sack-crete will
fill the hole. I made my own concrete with
Portland cement, 6-60 lb sacks of sand and 8
sacks of 3/4 inch rock. But 90 lb sack of
Portland is way more than needed for a single
dish hole, so the pre-mixed sack-crete is a lot
easier. Let pole set for 48-hours before hanging
the dish (I used to cheat and only allow
24-hours, but I was running a business so
couldn't sit on my hands for an extra day).
I drilled two holes near the bottom of the pipe
as right angles and used a short piece of rebar
(such that the ends would not touch the
sonotube. Without them dish could easily break
free and rotate. No failures over 5-years of doing this.
73, Ed
Delivered Sun-Slew drive motor and tee-bar
(2.5-inch ID sched-80 pipe welded to 4-foot 3x3
steel pipe) to my welder who is fabricating my
new dish mount for the 4.9m dish. Est. install of dish in July.
At 05:58 AM 4/25/2021, Leslie L via Moon-net wrote:
>Hi all,
>
>Looking for advice on installing an inground
>pole mast for a mesh or lightweight dish ,
>about 2.4M to 3.0M. Need a total of 6 feet
>above ground, 2 inch diameter to match my Spid
>RAS.  So I figure 3 feet in the ground, but
>how do you stop it from spinning ? Have
>you used welded fins or bolts? How much
>concrete? Post digger or
>shovel? Sonic tube? What type of pipe and
>where to you get it?  Galvanized Steel pipe? Â
>
>73
>Les
>W2LPL
>
>_______________________________________________
>Moon-Net posting and subscription instructions
>are at http://www.nlsa.com/nets/moon-net-help.html
73, Ed - KL7UW
http://www.kl7uw.com
Dubus-NA Business mail:
dubususa(a)gmail.com
What a difference compared to 2020 this year. More Italian and North
American stations active.
This makes EME contesting so nice. Even worked single Yagi, QRP and new
initials.
Conditions vary during the day. At moonrise it looked to be fully blocked.
Thought my antenna had a problem. But after sunset it really improved. Great
signals during the night.
I will be QRV today again around 45 minutes after my moonrise for the last
part. Looking for JA, VK and CW stations.
Even hope to work some more EU stations.
73, Peter PA2V (mainly around 432.073 MHz)
Hi all,
Looking for advice on installing an inground pole mast for a mesh or
lightweight dish , about 2.4M to 3.0M. Need a total of 6 feet above
ground, 2 inch diameter to match my Spid RAS. So I figure 3 feet in the
ground, but how do you stop it from spinning ? Have you used welded fins
or bolts? How much concrete? Post digger or shovel? Sonic tube?
What type of pipe and where to you get it? Galvanized Steel pipe?
73
Les
W2LPL
Peter PA2V,
I’ll set the alarm for 3.00 local (17.00Z) and hope to work you after a quick infusion of caffeine. I finished setting up my Adaptive Polarisation setup using 4x WSJT-X slices 0.45,90,135 as well as Map65 of course. Alex HB9DRI kindly remoted into my PC for 5 hours to set up the system which uses the IQ+/ UADC4/ Linrad/ WSJT-X combination. Very impressed having access the the WSJT-X decoder in the 4 WSJT-X instances using adaptive polarisation. Provides a quick view of conditions as you can see which polarities are receiving and their signal strength. It does use more screen real estate which provides that all year round sun tan but hey its going into winter here!
cheers
Mick Price
Hello,
Worked 2 inits last evening IW2FRZ #7 (loud) and SM6CKU #8. Hrd not wkd
OK2AQ.
Worked F2CT with a nice sig. Had +/- 1.4 dB of Moon noise on my tiny
1.80m, and reasonable echoes.
Not much activity on CW. Limited window, but will be on the evening
from 19z to ?
73,
Hervé F5HRY
“Sooner or later, everything old is new again”
Stephen King (thinking about analog radio modes ...)
--
L'absence de virus dans ce courrier électronique a été vérifiée par le logiciel antivirus Avast.
https://www.avast.com/antivirus
Thanks for the many replies about suitable IF frequencies and rigs. I'm
leaning towards Kuhne G5 transverter with 432MHz IF, driven with my TS2000.
I can easily solve the potential transmit spike issue.
Two further questions if I may:
1) With respect to commercially available preamps, I note the Kuhne and
DownEast Microwave devices. Any others to consider?
2) With respect to feed, has anybody experience with I0JXX feed for offset
dish?
73
David, G4YTL
I'm wondering if anyone has experience dealing with RFI from a laptop (or
other computer) when connecting audio via USB?
I have a Kuhne 3cm transverter, an FT-817, and a Rigblaster (which uses a
USB audio connection to my laptop). This has been working fine for
terrestrial contacts, but I'm running into issues trying to receive the
DL0SHF beacon.
When the USB cable is connected, there's a bunch of interference on ~144.0
MHz, with sidebands extending up at least 25kHz, which makes a mess of the
spectrum at the beacon frequency (144.025 at the IF radio, +/- doppler).
I've tried adding ferrites to the USB cable but with no effect.
The laptop is a Thinkpad T470s which has otherwise worked fine with weak
signals at higher frequencies in the band. This is running on batter
power, also.
Any ideas / suggestions?
- James W7TXT
--
James Morris
<jmorris(a)namei.org>
Congrats Gene on such a massive undertaking!
Great sigs every time you moved to a new location.
Thanks for all the new states and grids.. and major props to K2UYH for his
WAS!! Well done!
Congrats all that snagged him on his trip.
- Jay N1AV
Yesterday I worked 45 stations from Kentucky to complete operations, and
nudge several stations closer to W.A.S. The whole trip came off as planned
with no equipment failures - I heard Murphy was resting after visiting the
Texas power grid. :-)
I'll get LoTW up-to-date this afternoon, I see that I can log the Q65
contacts now.
I'd like to thank Joel, W5ZN, and Craig, N8DJB/4 for letting me squat on
their property and operate - their support made it smooth going. A thanks
also to Ben, K4QF who had a Plan B site ready for me in Alabama if things
didn't work out with the commercial campground.
Most of all a hug and thanks to my wife Joyce who rode along and thinks
that getting W.A.S. on 23 EME is a fantastic undertaking. She was jumping
up and down with excitement when K2UYH got his #50.
If you enjoyed the adventure a donation to my PayPal account would be much
appreciated. geneshea at gmail dot com
73,
Gene, KB7Q
