Date   

Re: Airscout

Dave
 

I loaded up the new version v1-3-3-5 and with David G4ASR’s suggestion let it load up all night. The outcome is that I can at last see the top window for the first time. The only problem now is that it is not populated with any planes at all. Do I need to change a setting?
73
Dave G4GLT. 


On 16 Feb 2021, at 20:08, Tony G4NBS via groups.io <anthony.collett@...> wrote:

I was using both Virtual Radar Server and Planefinder with the same results last Tuesday in the UKAC John.

Switched to only using OpenSky after Paul G3YDY suggestion - did not need to re-install anything, it simply worked OK since.

Regards
Tony G4NBS


Re: SSB Electronic LT33S

Steve - WB0DBS
 

Looks promising, time for some reading and Google Translate!

Cheers,

Steve
WB0DBS



On Feb 16, 2021, at 5:34 PM, Robin Szemeti - G1YFG <robin@...> wrote:


I might be remembering it wrong, but I thought the LT23S was based on their "Microline 3" modules, the UEK-3 and the .USM-3

Anyway, usually its tweak up the LO for maximum smoke, then tweak up the transmit strip ... the full instructions for the UEK-3  are here:


and


They are in German, but it's easy enough to get the gist of it.

The PA unit is here, but no alignment instructions for that:




On Tue, 16 Feb 2021 at 20:38, Steve - WB0DBS <steve-krull@...> wrote:
Does anyone have alignment instructions for the old SSB Electronic LT33S? It’s based on the LT23S and I believe alignment instructions for the 23 would give a clue as to what to do for the 33 as they share the same circuitry. The LT33 main assembly and the RF output power meter even say LT23 on them. I have one I’m testing for a SK estate and with proper drive it’s only delivering 5-6 watts instead of 10. I have the LT23S manual and the LT33S supplement but neither contain alignment procedures.

Cheers,

Steve
WB0DBS









--
Robin Szemeti - G1YFG


13cm pre looks good

Robin Szemeti - G1YFG
 

Managed to find a bit of time to drop the SAV541 into the 13cm preamp board and run it up.

Looks good so far ... DC it is spot on, the auto-bias scheme resulted in 3V Vds and 60mA Id exactly as planned, the gain looks good and the gain roll-off is exactly where it was predicted.

Just needs a look up the input with the analyser tomorrow to confirm the input match is where I planned it and I'll make an attempt at a noise figure measurement ...

The only screw-up was the pinout on the PNP transistor pair used for the current mirror in the bias ... it was swapped left-right doh!  Easily sorted on the test board, just flip the device over and bend the legs ..  I must have made a mistake when creating the symbol from the datasheet ... I went back to PCB symbols to put the error right for version 1.1 and ... it was a mistake in the symbol downloaded from a commercial symbol library!! .. When you want something done right, do it yourself!

image.png


--
Best regards,

Robin Szemeti

Redpoint Consulting Limited

E: robin@...
T: +44 (0) 1299 405028
M: +44 (0) 7971 883371

CONFIDENTIALITY NOTICE
The information contained in this e-mail is intended only for the
confidential use of the above named recipient. If you are not the
intended recipient or person responsible for delivering it to the
intended recipient, you have received this communication in error
and must not distribute or copy it.
Please accept the sender's apologies, notify the sender immediately
by return e-mail and delete this communication.

Thank you.

--
Robin Szemeti - G1YFG


Re: SSB Electronic LT33S

Robin Szemeti - G1YFG
 

I might be remembering it wrong, but I thought the LT23S was based on their "Microline 3" modules, the UEK-3 and the .USM-3

Anyway, usually its tweak up the LO for maximum smoke, then tweak up the transmit strip ... the full instructions for the UEK-3  are here:


and


They are in German, but it's easy enough to get the gist of it.

The PA unit is here, but no alignment instructions for that:




On Tue, 16 Feb 2021 at 20:38, Steve - WB0DBS <steve-krull@...> wrote:
Does anyone have alignment instructions for the old SSB Electronic LT33S? It’s based on the LT23S and I believe alignment instructions for the 23 would give a clue as to what to do for the 33 as they share the same circuitry. The LT33 main assembly and the RF output power meter even say LT23 on them. I have one I’m testing for a SK estate and with proper drive it’s only delivering 5-6 watts instead of 10. I have the LT23S manual and the LT33S supplement but neither contain alignment procedures.

Cheers,

Steve
WB0DBS









--
Robin Szemeti - G1YFG


432 Yagi/ hgh VSWR

g4zod@btinternet.com
 

Once again my thanks for all the advice given on this group and also by private E mail.

Today I had the use of a calibrated Procom VSWR/ Frequency generator and tested the coax lead up to the antenna. I swept a range of frequencies and confirmed that there was a 6-1 VSWR

I charged up my Nano VNA tonight and will do some more tests tomorrow if time allows.

On my club net this afternoon we put togeather a team to drop my mast when the restrictions are eased.

In the mean time I will sort out my /p 5 element MET Yagi and get that up on a pole if H.M.G. decides there will be further long term restrictions on working parties. (and the Dragon does not throw a wobbly about more masts in the garden.)

Julian G4ZOD


SSB Electronic LT33S

Steve - WB0DBS
 

Does anyone have alignment instructions for the old SSB Electronic LT33S? It’s based on the LT23S and I believe alignment instructions for the 23 would give a clue as to what to do for the 33 as they share the same circuitry. The LT33 main assembly and the RF output power meter even say LT23 on them. I have one I’m testing for a SK estate and with proper drive it’s only delivering 5-6 watts instead of 10. I have the LT23S manual and the LT33S supplement but neither contain alignment procedures.

Cheers,

Steve
WB0DBS


Re: Airscout

Tony G4NBS
 

I was using both Virtual Radar Server and Planefinder with the same results last Tuesday in the UKAC John.

Switched to only using OpenSky after Paul G3YDY suggestion - did not need to re-install anything, it simply worked OK since.

Regards
Tony G4NBS


Re: High VSWR on 432 MHz

Tony G4NBS
 

Hi Julian
 
Many years ago I had a problem with water in coax on 23cms - strangely it made little difference to my Rx performance but the SWR was rather high and not a lot of it actually got radiated!

What happens if you put a short patch lead in line? I would guess that would alter the SWR the rig sees and might help explain why it sees worse than your SWR meter?
I'm inclined to agree with others that the problem might be worse than you suspect but might prove it either way.........

Good luck
73
Tony G4NBS 


Re: Questions, UK Microwave Group On-line Talk Wednesday 10th February 2021, at 20:00UTC

Alan Beard
 

Hi all,

Are there any comments re. my questions?

On Thu, 11 Feb 2021 08:13:29 +1000, Alan Beard via groups.io wrote
> Hi all,
> Practical questions:
>
>

> 1) Going for around 15db of gain on 23cm, home made, would you build a yagi or corner reflector
>      for a home tower installation?
>
>

> 2) The waveguide fed yagi, does this simplify the feed where it's size is practical?
>
>

> 3) Thick elements, you touched on this. Are there any design tables?
>
>

> Great talk, thanks.
>
>

> Alan VK2ZIW
>
>

>
>

> On Tue, 09 Feb 2021 03:32:46 -0800, G4LDR via groups.io wrote
> > The next UKuG on-line talk will be;
> >
> > Care and Feeding of Yagi’s – by Kent Britain WA5VJB - Wednesday Feb-10 at 20:00 UTC
> > Some interesting ways to doing Yagi’s and myths of Yagi Stacking.
> >
> > The talks will be streamed on this URL: batc.org.uk/live/ukmicrowave
> >
> > 73 Neil G4LDR.
>
> ---------------------------------------------------
> Alan VK2ZIW
> Before the Big Bang, God, Sela.
> OpenWebMail 2.53, nothing in the cloud.
>
>


---------------------------------------------------
Alan VK2ZIW
Before the Big Bang, God, Sela.
OpenWebMail 2.53, nothing in the cloud.


Aircraft Raytheon Window Part of Radar L Band System WMT650 PT6017 28-365-003S

matthew twyman <matthew222twyman@...>
 



Look at this on eBay
Aircraft Raytheon Window Part of Radar L Band System WMT650 PT6017 28-365-003S

Interesting just 4 W input is that 4KW output or 40KW (30 or 40dB gain)

No power supply ...

Think 

I will stick with 1 watt 

73

Matthew G6KOA 



222


Re: Since I was a bit bored ...

Neil Smith G4DBN
 

Nice!

Also prompts me to ask the question "What would you get up to if you were VERY bored?"

Neil G4DBN

On 16/02/2021 13:59, Robin Szemeti - G1YFG wrote:
So, not much going on over the weekend, work seems a little quiet, I thought you might like a bit of an update on what I've been up to with my SMD pick and place machine.


Re: Airscout

DAVID G4ASR
 

mine is running ok  ..i re-installed it yesterday and left it updating all the databases  .... it was running ok last night .... and all today .... so far 

RTL290 .... Open Sky .....  Virtual Radar Server 

David G4ASR


Re: 432MHz ATU?

John E. Beech
 

Hi Julian,
I'm going to suggest you build a K4ERO turnstile out of wood & wire. Only 6dB gain, omnidirectional and
horizontally polarised. OK, what you hear will be several S points down on what you are used to hearing and vice versa
but you WILL be able to work stuff without damaging your rig.

de John G8SEQ

-------Original Message-------
From: Robin Szemeti - G1YFG <robin@redpoint.org.uk>
To: UKMicrowaves@groups.io <UKMicrowaves@groups.io>
Subject: Re: [UKMicrowaves] 432MHz ATU?
Sent: Feb 16 '21 00:12

I would have to agree with others, with a 3dB return loss (6:1 VSWR)
the chances are the aerial is no longer connected and you just have
feeder left. 1.5dB up, 1.5dB on the way back down and there you are.

You may do better to erect a temporary aerial, even a small 9ele beam
on a bit of pole might be a significant improvement.

On Mon, 15 Feb 2021 at 23:44, Gordon REASON via groups.io
<gordonj.reason=virgin.net@groups.io> wrote:

> Your club members are coming to do some work ...Thats ofk .
>
> But do'nt gather for drinks and sarnies .
>
>> On 15 February 2021 at 23:03 "g4zod@btinternet.com via groups.io"
>> <g4zod=btinternet.com@groups.io> wrote:
>>
>> I have a long term problem with my 17 element MET Yagi. The VSWR
>> is rather high at about 6-1 and I cannot risk blowing my new
>> radio!
>>
>> I have no way of taking down my pump up mast to adjust the
>> matching on the antenna. The current restrictions mean I cannot
>> get my fellow club members around to help me drop the mast.
>>
>> As this means my activities on 432MHz have to be put on hold for
>> possibly many more months I need to find an interim solution. In
>> the mist and cobwebs of mind I recall an ATU for UHF frequencies.
>> I did a quick search and nothing came up.
>>
>> Can any group member confirm if an ATU for 432 MHz is practical
>> and if so any reference to one?
>>
>> Many thanks
>>
>> Julian G4ZOD
>
>>

--
Robin Szemeti - G1YFG


Re: Since I was a bit bored ...

G0FCU
 

Thanks for posting this Robin, very interesting.


On Tue, 16 Feb 2021, 13:59 Robin Szemeti - G1YFG, <robin@...> wrote:
So, not much going on over the weekend, work seems a little quiet, I thought you might like a bit of an update on what I've been up to with my SMD pick and place machine.

I usually use it for stuff I do at work, and we have a chap who has the offline programming software who comes in and sets up the programs for us, which is fine for paying production runs, but I have long wanted to be able to program it myself for ad-hoc projects and prototypes. I can enter all the parts manually, but that is no fun, and I really wanted to be able to go direct from a PCB in Eagle to a completed board popping out of the machine.

With lockdown showing no signs of ending, and we have another 2 of these machines in the USA for production, I dragged the one back home from my unit to my shed, where I could waste many hours on it. When it's just at the bottom of the garden it seems an easier task than driving into town to the unit.

image.png

The official offline programming software costs a fortune, so i couldn't really justify it for projects but I did find some free software[1]  that will parse an Eagle PCB file and write a production file for the machine, but sadly, only for a slightly different version of machine firmware.  After a bit of asking around, I managed to get a later version of the machine firmware. 

For added fun, the firmware I managed to get was DOS files ... and it is stored on the machine in some EPROMS.  I managed to read out the contents of the EPROMS, combine them together into one file and mount it as a DOS FAT12 file system, then replace the files with the new ones, split it up into 3 eproms worth and re-write the eproms. Its years since I wrote an eprom and finding a computer with a working parallel port was quite a big hurdle!

Unfortunately, after all that effort, even this new version of firmware did not work with the "free" programming tool, so, I wrote my own.  Reverse engineering the binary file format was a bit of a task, lots of trial and error. After many, many hours of work, I had a pretty good "map" of the binary file format, althoug I never quite managed to get to the bottom of some of the internal checksums, so the first time it loads it moans about checksum error, but once re-saved to disc it is fine.

The first version succesfully read an Eagle file and spat out a Juki PCB machine file ... assigning all components to feeders and you just tell the machine to ignore the ones you don't have

It ran the bulk components on the Ionica 9cm transverter boards without issue:


That got a bunch of the "reel fed" components done, but there was still a significant number of "odds and sods" to sort out and I really did not fancy doing them by hand.:

image.png

Small runs and prototypes often need just a few weird one off components, not something you would want to buy a whole reel of .. and with 70 or 80 different components on a design, even if you buy part reels, there is a £3.50 re-reeling charge from Farnell for each one, it soon adds up!

What the machine can do, as well as picking from reels and stick feeders is pick parts from a tray, with a grid of components ... I had the idea if I could arrange strips of cut-tape components on a flat surface, the machine could treat it like a matrix tray (in strips of 20x1 components, 2mm or 4mm pitch) ... lay each strip down next to each other and tell it that it has 40 "trays", each one column wide and 20 components long.

I modified the board parser software to pull the data out of the board file and put it into a database,  then produced a simple web interface to go through the database and let me decide if the component is going to be "reel fed", "tray" or "hand placement" ...

So in the web interface, I have a list of boards:

image.png


And for each board, I have a list of components, with their position, rotation, package data:
image.png
And finally, I have a list of feeders, with how many components of each type are needed.

image.png


To make the construction of the "trays" idiot proof, I print out a sheet of A4 on the laser printer that has the components laid out in cut strip, with the value and package shown, along with the quantity required.  I'm going to stick these down to A4 pieces of MDF, use sticky spray to mount the component strips and then mount the pre-prepared slab in the machine, removing the plastic top tape when its all set up.

image.png




The production file is all set up with the machine position offsets, so in theory I just load the bulk components on the reels, the oddballs onto the "sticky A4 sheet", use the camera and cross-hairs to confirm the base pick positions and off it should go!  Providing I don't jiggle the tray and bounce the components out anyway ...

I'll stick the software on GitHub[2], just in case it is ever useful to anyone apart from me, which I very much doubt.



--
Best regards,

Robin Szemeti
G1YFG


--
Robin Szemeti - G1YFG


Re: Since I was a bit bored ...

Maarten PA0MHE
 

Very nice job !!! congratulations.


Since I was a bit bored ...

Robin Szemeti - G1YFG
 

So, not much going on over the weekend, work seems a little quiet, I thought you might like a bit of an update on what I've been up to with my SMD pick and place machine.

I usually use it for stuff I do at work, and we have a chap who has the offline programming software who comes in and sets up the programs for us, which is fine for paying production runs, but I have long wanted to be able to program it myself for ad-hoc projects and prototypes. I can enter all the parts manually, but that is no fun, and I really wanted to be able to go direct from a PCB in Eagle to a completed board popping out of the machine.

With lockdown showing no signs of ending, and we have another 2 of these machines in the USA for production, I dragged the one back home from my unit to my shed, where I could waste many hours on it. When it's just at the bottom of the garden it seems an easier task than driving into town to the unit.

image.png

The official offline programming software costs a fortune, so i couldn't really justify it for projects but I did find some free software[1]  that will parse an Eagle PCB file and write a production file for the machine, but sadly, only for a slightly different version of machine firmware.  After a bit of asking around, I managed to get a later version of the machine firmware. 

For added fun, the firmware I managed to get was DOS files ... and it is stored on the machine in some EPROMS.  I managed to read out the contents of the EPROMS, combine them together into one file and mount it as a DOS FAT12 file system, then replace the files with the new ones, split it up into 3 eproms worth and re-write the eproms. Its years since I wrote an eprom and finding a computer with a working parallel port was quite a big hurdle!

Unfortunately, after all that effort, even this new version of firmware did not work with the "free" programming tool, so, I wrote my own.  Reverse engineering the binary file format was a bit of a task, lots of trial and error. After many, many hours of work, I had a pretty good "map" of the binary file format, althoug I never quite managed to get to the bottom of some of the internal checksums, so the first time it loads it moans about checksum error, but once re-saved to disc it is fine.

The first version succesfully read an Eagle file and spat out a Juki PCB machine file ... assigning all components to feeders and you just tell the machine to ignore the ones you don't have

It ran the bulk components on the Ionica 9cm transverter boards without issue:


That got a bunch of the "reel fed" components done, but there was still a significant number of "odds and sods" to sort out and I really did not fancy doing them by hand.:

image.png

Small runs and prototypes often need just a few weird one off components, not something you would want to buy a whole reel of .. and with 70 or 80 different components on a design, even if you buy part reels, there is a £3.50 re-reeling charge from Farnell for each one, it soon adds up!

What the machine can do, as well as picking from reels and stick feeders is pick parts from a tray, with a grid of components ... I had the idea if I could arrange strips of cut-tape components on a flat surface, the machine could treat it like a matrix tray (in strips of 20x1 components, 2mm or 4mm pitch) ... lay each strip down next to each other and tell it that it has 40 "trays", each one column wide and 20 components long.

I modified the board parser software to pull the data out of the board file and put it into a database,  then produced a simple web interface to go through the database and let me decide if the component is going to be "reel fed", "tray" or "hand placement" ...

So in the web interface, I have a list of boards:

image.png


And for each board, I have a list of components, with their position, rotation, package data:
image.png
And finally, I have a list of feeders, with how many components of each type are needed.

image.png


To make the construction of the "trays" idiot proof, I print out a sheet of A4 on the laser printer that has the components laid out in cut strip, with the value and package shown, along with the quantity required.  I'm going to stick these down to A4 pieces of MDF, use sticky spray to mount the component strips and then mount the pre-prepared slab in the machine, removing the plastic top tape when its all set up.

image.png




The production file is all set up with the machine position offsets, so in theory I just load the bulk components on the reels, the oddballs onto the "sticky A4 sheet", use the camera and cross-hairs to confirm the base pick positions and off it should go!  Providing I don't jiggle the tray and bounce the components out anyway ...

I'll stick the software on GitHub[2], just in case it is ever useful to anyone apart from me, which I very much doubt.



--
Best regards,

Robin Szemeti
G1YFG


--
Robin Szemeti - G1YFG


Re: Airscout

neil whiting
 

Anything in the log file? 
That's a very good question Neil.

I found the log file and indeed the error in mine is associated with the radarbox24 feed.
I removed that one from my selected feeds and no longer get the same error.
There were a couple of:
System.Net.WebException: The underlying connection was closed: The connection was closed unexpectedly
but the planes are showing again despite these messages.

I don't know how to set that ADSB Exchange feed path in the options.

Thanks/73
Neil G4BRK


High VSWR on 432 MHz

g4zod@btinternet.com
 

Good morning all.

Thank you all for your helpful feed back.

It is interesting that I can still hear the Beacon PI7CIS with my mast down. (and I am in Greater London) This seems to indicate that the Coax is still connected to the Antenna.

The last time I dropped the Scam Mast to change the seals and worked on the various Yagis, I found when we heaved the mast up, the VSWR had gone up up on the 70CMs Yagi .

What is interesting is that the VSWR goes up and down slightly depending on which meter I use to test it. ( But I can understand why I get these variation) (I did use a Bird Meter with a 800 MHz slug and it gave me a VSWR reading of about 3-1.)

It seems that my new radio senses a higher VSWR then all my other stand alone meters.

Until HMG and Boris ease the the restrictions sufficiently to get a "Working Party" around to my house I will stick to my 70Cms Colinear.

Thank you for the advice about the possible use of a suitable ATU. I think I will shelve the idea.

The good news is the my 2 Metre 5 element MET and 23 CMs 14 over 14 Tonna which have been on my mast for 28 Years are still working perfectly, so I can still get some contacts.

Julian G4ZOD



Re: 432MHz ATU?

Mike Willis
 

ATU is a waste of time. Sounds like the coax connection is broken at the top. Enjoy 23cms and up until you can get it fixed.
--
Mike G0MJW


Re: Airscout

Neil Smith G4DBN
 

Anything in the log file?  I'm using the ADSB Exchange feed with the internal API key and query URL string

https://public-api.adsbexchange.com/VirtualRadar/AircraftList.json?fNBnd=%MAXLAT%&fSBnd=%MINLAT%&fWBnd=%MINLON%&fEBnd=%MAXLON%&fAltL=%MINALTFT%&fAltU=%MAXALTFT%

and it seems to be working normally at the moment.

Neil G4DBN

On 16/02/2021 09:13, John Lemay wrote:
For the past week or so, Airscout has not been working well, and I see error
messages like "the remote server returned an error; (500) internal server
error".

I've disabled the Planefinder.net feed, which has improved things somewhat,
but it's not a cure.

Are others seeing error messages, and what can be done ?

Thanks,

John G4ZTR

1861 - 1880 of 62970