I have been playing with a new Triquint ULNA device (TQP3M9036). It
Shows a lot of promise. It is like a MAR or MSA device in that it is
50ohm in and out. and has a claimed NF about .4db nf ( their numbers).
I have built several pramps to test them and have gotten even better
than they claim and they cover 50-1296 with ease and NF is .4ish or
below. The S11 and S22 are both great and the OIP3 is +35db also
...very nice device. It has great promise as a good terrestrial LNA.
Preamps are foolproof to build and would cost under $50 if all the best
quality parts are used.
Just for information only ...
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I’m ready on 6cm with the same dish I’m using on 3cm.
Despite the strong local 5 GHz WiFi noise, had a nice 579/569 first QSO with this setup today with HB9Q, thank you Dan !
Setup is a 3.7m dish and 60W at CP feeder.
I can be QRV on 6cm or 3cm most of the days, skeds and tests are very welcome, as usual.
qrv 70cm, 33cm, 23cm, 13cm, 9cm, 6cm and 3cm.
This weekend I operated 6cm using just 16 Watts to a 1.9m PF dish with an
SM6FHZ septum feed (kindly loaned to me by G3LTF) On RX, a single stage
0.9dB LNA based on a "Franco" LNB board. See RSGB RadCom "GHz Bands" column
July 2014 for details.
I had 7.5dB sun noise and 0,25dB Moon noise.
On CW I worked OK1KIR, HB9Q and DF3RU. "Gotaways" on CW were OK1CA, OF2DG,
ES5PC, PY2BS all identified calling CQ. I need more power!
On JT4F I worked HB9Q, OK1KIR, OK1CA UA3PTW, OZ1LPR and PY2BS.
A good start to the 6cm project at G4BAO. Watch this space, more power
Just wondering when there will be some activity on 13cm ?
I am on HB9Q logger (13-9cm) every day but not much people around there.
Every month there are separate band contests at the best propagation
In between most switch to the next band and have no time to try other bands
Except for a few that I managed to work and on my request put the correct
feed in there system.
If activity is only at 13cm contest weekends then this was sure a waste of
Lucky I had the fun to assemble all parts and have it all working.
Guy ON4AOI - OT7K
Yes I've successfully completed the mods and will write up the work in due
On 9 Jun 2017 10:01, "Donald Hawbaker donaldhawbaker(a)yahoo.com
[ukmicrowaves]" <ukmicrowaves(a)yahoogroups.com> wrote:
Have you made any progress on this project? I recently began using a DRO
Machine readout for elevation. It's the only way I can tell where my
elevation is pointed. After only a few minutes of bumping the elevation up
and down, the SPID readout is off by 6 degrees. Don't have a solution for
azimuth. I am experimenting with the higher bands now, so something has
got to be done. I guess I will first take a look at what is going on, what
do the pulses look like, do I have excessive noise. I have already moved
the sense circuits to a seperate cable, but no help. It still miscounts.
Maybe look at shielded cable, but in such a system, it's hard to tell
exactly where is ground. 73
Sent from Yahoo Mail for iPad <https://yho.com/footer0>
On Thursday, February 9, 2017, 12:58 PM, g4bao john(a)g4bao.com
[ukmicrowaves] <ukmicrowaves(a)yahoogroups.com> wrote:
Befefore I reinvent the wheel this spring and before I strip down my RAS,
has anyone out there fitted absolute rotary encoders of the MAB 25 style to
a SPID RAS and more importantly documented it?
Also if anyone has stripped down and rebuilt a RAS I'd be interested in any
tips, pitfalls and gotchas.
I used to regularly strip down and rebuild a a Suzuki T500 charger engine
in my youth,so I'm not scared to have a go but I had a Haynes manual!
You could save me a lot of time and headscratching.
Also an exploded diagram of the rotator would be nice
Answers on a postcard to.......
Posted by: Donald Hawbaker <donaldhawbaker(a)yahoo.com>
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I'm just putting my 432 eme antennas back up, having installed motorized drives for Alt, Az and polarization. The antenna (2 x 29el yagia) has been down for about 6 months. While testing the Rx I found a couple of problems.
(1) First is I'm getting a 140ms burst of noise every 18.75 seconds. Analyzing it, it's a short burst of digital data (coded as brief 5-10 cycle bursts of 30kHz modulation). It's spreading all across the band and originates at 433.95 MHz, so I assume it's a bad ISM transmitter somewhere in the area. It appears to be real and not due to preamp or receiver issue, since it's still there with no preamap and a 3dB line loss. The fact that it's as regular as a Pulsar suggests it's some sort of automatic telemetry device(?) rather than a garage or car door opener. I see quite a few ISM signals pop up in the 433.9 region, but only this one is regular and spreads out all over the 432-435 region.
My question is how resilient digital modes (JT65) are to this type of QRM. The pulses are quite easily audible (maybe 5-10dB out of the noise)? Noise blanker has no effect since they are relatively long (140ms). It's annoying but if it's not going to significantly degrade performance, I can live with it. I will try to locate the course of course, but previous attempts at finding the source of QRM haven't usually been successful.
(2) The other odd thing is that, based on sun noise, the beam pattern of the two yagis (horizontal stacked) seems to be about 5 degres off boresight in the horizontal plane. I'd never noticed this before, but I'd never had the ability to remotely sweep the array across the sun and take measurements. The antennas are physically aligned well, have identical (within a few mm) length feed lines of the same coax from the same spool and the power splitter is symmetrical to within a couple of mm. I wouldn't expect 100% perfect boresight alignment, but 5 degrees just seems like a lot when the beamwitdh of the whole thing is around 15 degrees.
Any thoughts? I'll try switching around feed lines etc. to see what effect that has, but is there something I may be missing. I'm no antenna expert.
I'm wrestling with the thought of moving up in frequency from 432. While I have a working system (2x28el and 550W) and made 26 QSOs in last year's contest, I'm plagued with all kinds of local noise at 432. I have bursts from ISM devices every 18 seconds (still not found the source), which I can live with since they are short (200ms) and infrequent. What's worse Is I just "mapped" part of the sky to measure noise. In some areas I see 5 to 6 dB more noise than my 50 ohm load (it's not real sky noise of course, it's too loud and it doesn't move as the earth rotates). In the quietest directions I see about 2.5-3dB less noise than my 50 ohm load (should be closer to 4.5 dB less in theory if everything is working right). The excess noise varies as I rotate polarization which might be due to the pattern of the antenna changing or the noise may be polarized. There van be as much as 5dB difference in noise between H and V polarization. When I'm seeing 5dB higher noise from the antenna than a 50 ohm load, I'm pretty deaf to weak EME signals. On top of all that, this is what my local 432 spectrum looks like:
You can see why my preferred operating frequency is 432.075 (the horizontal line half way up is a broadband burst of ISM noise). I doubt there's anything I can do to clean up the local RF environment enough to make much of a difference. I think I'm fighting a loosing battle on 432.
In the hope of getting away from all the RF crud, I'm considering moving up in frequency. The obvious choices are 1296 and 10GHz from the point of view of activity level and available equipment. I have an old SOTA transverter from the 1970s which probably still works OK. I also have 10W solid state and 1, 2 and 6 tube (2C39) amps for 1296. None have been on the air in a few decades, but they can probably be revived. I have a solid 100W+ from the 2 tube amp in a case with power supplies and bias. Should be turnkey operation. The 6 tube hasn't really been tested. I remember it as a bit of a pig to tune up. I've also got a bunch of 1980's vintage GaAsFET preamps, so getting a 1296 station with 100W out should be postly a case of connecting up wires!
On 10Ghz I have the component parts of the old SSB electronics 10GHz transverter. They may need some work to get a signal on the air and power out would be 100-200mW at best. No amplifier.
The other part of the equation is antenna limitation. The biggest dish I can accommodate would be a 6ft (or 2m). For multiple reasons I cant do 8ft or bigger. 6ft is very small for 1296, but a fair size on 10GHz (requiring precision aiming).
So the question is, where to put resources? I can probably (relatively) quite easily get on 1296 with a 6ft dish and 100W. Hopefully the noise level will be much better than on 432 (I'm going to try to check that out pretty soon). I know that's enough to make a few contacts, but does anyone with a similar system have a comment on just how effective it might be? There's a chance I could get to 400W, but I still only have a small dish so my hearing ability would be limited.
10GHz would be more work and more uncertain (can I get the parts I have assembled into a working transverter - with good frequency stability? Can I generate enough power? Can I get/buld the needed components such as feed horns, relays etc.). How hard is it going to be to generate enough power (and how much power do I need). From rough calculations it seems like 10W might be enough to start, but how hard to build/buy (and expensive) is that kind of power on 10GHz these days? How much harder is it working 10GHz (fading, frequency stability, pointing accuracy etc.) than 1296?
I guess the way to go would be to try to get a 6ft dish installed and then listen on both bands before looking at power generation, but I'd appreciate comments from small 1296 stations and from anyone who has built a 10GHz system from commercially available (surplus or new) components (or kits).
I'm not giving up on 432 yet and I now have working motorized Alt, AZ and polarization control. It's just that it's a real battle fighting the noise and it's a battle I'm not likely to win. I'll be QRV on 432 again later in the year.
I FINALLY got several versions of WSJTX set up & spent two weeks testing on receive only.
My set up was WSJT 7 & WSJTX version 1.7.0 & also WSJTX 1.7.1. I used my Signalink USB sound card
To my desktop computer Window 7. & JT65B & had the three windows running
What I noticed is Wsjtx decodes rapidly may be 1/2 a second faster than wsjt & also has lower decodes than WSJT of about 1 to 2db but at no time it decoded signals that was not decoded on WSJT.
So I am trying to find a reason to use it. I like the colors, i like the WIDE GRAPH settings after talking to every one who would listen to me & kindly explained how to set it up. No more false decodes after setting up the advanced window correctly. I left the Synch at -1 & voila!!
Now if anyone can give me a reason why I should use it please email me directly so that I do not drive 1357 people who monitors the reflector to insanity.