Dear Friends
After the great success in 13cm I'm looking fwd to expand my operations from
South Africa in 9cm and 6cm (later on 3cm).
For 9cm I have 100% everything I need, transverter, preamp, DB6NT 120w SSPA
and of course a functional 3.6m solid dish.
9cm is a matter of the South African authorities if they will give me a
special research permit to operate in that band, we are waiting.
My original plan was to move directly to 10GHz but I want to evaluate if is
good to move to 6cm in between, the effort will be almost the same (probably
more expensive in 10GHz).
I have nothing for 6cm, in that way, based on your experience I will request
your kindly advice about:
- Transverter.
- Feed for my dish f/d 0.5
- Preamp
- Good RF power (not marginal), the maximum legal power in SA in 6cm is
400watts
I have already the numbers for 10GHz provide by Dan HB9CRQ and our 3cm
project in HB9Q but I want to see if 6cm could be a good intermediate step.
Especially if I fail in the permission to use 9cm
Ok, 6cm EMEr's, your feedback is welcome
73 de Alex, ZS6EME (HB9DRI)
Tom, if the azimuth axis is not perfectly vertical (never is perfect) the
actual azimuth direction has a built in error that is related to the amount
and direction of the axis tilt and the elevation angle.
Without getting into the details I will give you an extreme example of the
obscure and not well understood problem:
Assume you live at a latitude that allows the moon to reach an elevation of
90 degrees. Further assume that there is an azimuth axis tilt of .5
degrees toward the east and the moon is passing through a calculated direction of
180 degrees.
The calculated azimuth axis would be straight up. The tilt toward the east
changes the axis from a calculated value of 180 degrees to an actual angle
of only 90 degrees. The elevation angle is reduced from 90 degrees to 89.5
degrees.
This is an extreme example but the trend and concept is present for other
latitudes and tilt directions. This is the same problem that is encountered
with multiple side by side feeds in a dish. Working with Al, W5LUA in the
past we have been able to mathematically correct his errors to a large
degree. On my own system, the tower has a slight lean toward the southeast that
requires a correction of about 2 degrees in azimuth as the moon passes
through zenith. The correction varies as the declination and elevation angle
varies.
I hope this is the issue you were asking about. If not, please ignore this.
73,
Gerald K5GW
In a message dated 7/26/2016 4:41:53 P.M. Central Daylight Time,
w2drz(a)ramcoinc.com writes:
Hi,
If on 3 cm auto tracking and must correct moon noise during a QSO?
I am trying to understand why the auto tracking does not do 100% correct
TRACKING,
the cause may be various reasons?.
Those on 3 cm or 5760 and auto tracking,
drop a note on what you find and if have found a cure of the error problem.
Try to change the W2DRZ controller and AB encoders to hi res (16 bit) on
the
encoders to see if that changes the tracking error.
the USD encoders will then do about 14 bit resolution or "1 tenth a degree"
(0.01) degree.
tom W2DRZ
http://www.w2drz.ramcoinc.com/http://www.w2drz.ramcoinc.com/ProgNotes.htm
_______________________________________________
Moon-Net posting and subscription instructions are at
http://www.nlsa.com/nets/moon-net-help.html
I'm trying to track down a source of broadand source of noise on 432. There's an overall rise in noise level, plus sharp "clicks" at an irregular rate of maybe 1-5 per second. Since I don't do much tropo work from this QTH it's mainly giving me a problem on EME, where the side lobes seem to be picking it up at various antenna positions. My tropo antenna shows a fairly sharp peak at one bean heading. I attempted to triangulate a position by moving maybe 1/4 line away and got a rough direction with a small Yagi. The direction was different from that of my QTH, which suggests the source is local. However - and this is the problem - when I drive over to the place where the two directions cross - about 1/2 mile away - I hear absolutely nothing!
The rise in background noise is around 5 or 6dB on the tropo antenna and the clicks are very loud. The noise blanker lowers them, but can't remove them. I don't hear it on 144 -there I have a different noise source, on a different beam heading and I've tracked that one down to what appears to be a large roof mounted metal box on a residential building, but as far as I can tell it's not putting out anything at 432.
Has anyone experienced anything similar? For those skilled in tracking down UHF noise, what's the typical range over which something like an arcing power line can be heard? I'm assuming it's fairly local since the bean heading seemed to change by 15-20 degrees with a small change in location. I've yet to come up with an explanation of why I hear nothing at the beam heading crossing point. There is a local municipal public works building at that location, but I can't detect any 432 RF (or any other RF) coming from it when parked 50 yards away with a line of sight view.
It would be good to get more than two directions for triangulation, but I'm on a ridge and when I move off the ridge I'm down in the treed and I lose the signal. It's been a very frustrating process so far... The noise is 24/7, so it's not likely to be any sort of household or even business appliance or lighting or HVAC. My guess is an arcing power line or pole transformer, but I've driven the local roads and heard nothing.
Bob
KA1GT
Hi All,
Because there have been so many questions regarding soundcards that work
and don't work with various operating systems, various pieces of
software, etc. I have decided to create a publicsoundcard database.
It can be referenced at this link:
http://w3sz.x10.mx/Soundcards/SoundCardDataBaseMainForm.html
Right now it contains just "fake" data that I used for testing.
If you are interested, please check it out, try entering more fake data,
etc.
Once you enter a record you cannot change it. I did this to maximize
the security of the database. So if you make a mistake (once it is
taking real data) you would need to email me to get the bad data corrected.
I am looking for comments on whether the forms are easy to use, whether
the data display is easy to understand, whether data fields should be
added (or removed if they are felt to be unnecessary). Because the data
is stored in a MySQL database, it is trivial to add new fields. But too
many fields would make the display more difficult to read, so there is a
trade-off in this respect. It is of course also trivial to change fields.
My thought is to leave this in its testing phase with "fake" data until
after the EME conference, in order to give enough time for comments and
discussion. If there is consensus on revisions, I will make them as
such consensus emerges. I will return to the USA from the EME
conference September 1, so the testing phase will continue until then as
I don't know if I will have computer access while in Europe.
I am posting this initially to the Linrad and EME lists. I will later
make separate postings to the other SDR lists, but I want to start with
a smaller and more technically sophisticated audience, and so I have
chosen the lists that contain such an audience for this posting.
Thanks in advance,
Roger Rehr W3SZ
I regret to inform you of the passing of Gunter VE7CLD on July 14th . Gunter was active on 24 GHz EME in 2002/3 and attended many of the Microwave Update conferences throughout the USA.
73
Barry VE4MA
Gabi,
One thing I would want....
Please put it into production before the UK leaves the EU...
Otherwise anyone in UK will have to pay customs duties, VAT and admin costs and not just the VAT!!
Peter G4URT
PS Do not blame me - I voted Remain.
Hi Lunatics,
I finally made myself some free time to do some initial test on my 3cm system (3m@ dl3bpc preamp)
and tnx to Peter for organising the AW. it is a nice opportunity to test the system
stations hrd
sp6jlw
oz1lpr
oh2ahx
ok1kir
wa3lbi
db6nt
sa6bun
pa3dzl
hb9q
sm6cku
iz2djp
even some ssb qso’s were spotted :)
haven’t done a decent moon/sun noise measurement yet , I do hear moon noise.
the tracking seems ok, rx system need some adjustment ( tuning feed and position )
but so far so good :)
Jurgen PE1LWT
