Date   

Re: Cardiff Roundtable March 7: Mesh networks, beacons, GaN, HD Video, Amplifiers

Paul G8KFW
 

Hi could they be streamed  also the comments from the audience

 

Alternatively if the presentation is available in electronic format could that be made available

 

Paul

 

 

 

From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of Neil Smith G4DBN
Sent: 05 March 2020 22:53
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] Cardiff Roundtable March 7: Mesh networks, beacons, GaN, HD Video, Amplifiers

 

Ref Raynet: Interesting example locally this week of what happens when the cellphone network dies and then the emergency services radio system stops working, and all the roads are under water and the power is off, and the landlines aren't working and there is no internet service and the water just keeps coming. Local Raynet group were called out and provided comms for the police and ambulance and council during the flooding, and as the local 4x4 response volunteers had the foresight to get licenced and work with Raynet, things went smoothly.  I guess the folks who sold the radio system will make some weedy excuse about nobody telling them it had to work with the kit under water and without mains power.  I heard a rumour that the fire service had, er, "forgotten" to scrap their old low-band VHF sets when the fabby new system went live, so they managed nicely as a result. Now if the local Raynet group also had a mesh network and an uplink from an area with internet and power, they could have provided an even better service.

Are the talks going to be recorded or streamed?
Neil G4DBN

No virus found in this message.
Checked by AVG - www.avg.com
Version: 2016.0.8048 / Virus Database: 4793/15886 - Release Date: 08/14/18
Internal Virus Database is out of date.


--
Paul Bicknell G8KFW   South Coast UK


Re: Cardiff Roundtable March 7: Mesh networks, beacons, GaN, HD Video, Amplifiers

Neil Smith G4DBN
 

Ref Raynet: Interesting example locally this week of what happens when the cellphone network dies and then the emergency services radio system stops working, and all the roads are under water and the power is off, and the landlines aren't working and there is no internet service and the water just keeps coming. Local Raynet group were called out and provided comms for the police and ambulance and council during the flooding, and as the local 4x4 response volunteers had the foresight to get licenced and work with Raynet, things went smoothly.  I guess the folks who sold the radio system will make some weedy excuse about nobody telling them it had to work with the kit under water and without mains power.  I heard a rumour that the fire service had, er, "forgotten" to scrap their old low-band VHF sets when the fabby new system went live, so they managed nicely as a result. Now if the local Raynet group also had a mesh network and an uplink from an area with internet and power, they could have provided an even better service.

Are the talks going to be recorded or streamed?
Neil G4DBN


Re: Connector ID please?

Derek Kozel
 

Looks like SMP to me?

On 05/03/2020 20:33, Wilko wrote:
I just received 2 surplus 13cm PA from Poland which have coax connectors as show below. Is this a standard connector type? My junk box did not have anything that fits. Suggestions most welcome!

73 Wilko



Re: UK Microwave Group - Low Band Contest - March 8th

Brian Howie GM4DIJ
 

No 13cm 3.4GHz is a bit optimistic. UVR might be workable.

Depends on weather.

Callsign: GM4DIJ/P
Locator: IO74MU10CA
Bands: 1.3GHz 20W 27ele QLY
3.4GHz 2W 7 ele PCB yagi
Talkback: ON4KST
Times: roughly 14.00 to 16.00 after 144/432 ends


73, Brian GM4DIJ
--
Brian


Connector ID please?

Wilko
 

I just received 2 surplus 13cm PA from Poland which have coax connectors as show below. Is this a standard connector type? My junk box did not have anything that fits. Suggestions most welcome!

73 Wilko


Re: UK Microwave Group - Low Band Contest - March 8th

ian hope (2E0IJH)
 

For this one there should be lot of activity on 2m, as it's also the 144/432 contest weekend, due to weather and having to alter site and kit, we are unlikely to able to pull the 23cm kit out as well, but hopefully some of the larger groups will also have some microwave kit out as well as the 144/432
 
Ian
2E0IJH

 
 
Sent: Thursday, March 05, 2020 at 8:19 PM
From: "Martyn G3UKV" <ukv@...>
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] UK Microwave Group - Low Band Contest - March 8th
Hi Ben
Good to hear 2m talkback is being used by some ops. I prefer it to 'KST, but needs must . . . .
I keep 144.390 monitored most of the day, so hope to catch you.
Operational 1.3, 2.3 most of day, and 3.4G for the last hour or two.
73 Martyn G3UKV
IO82RR (Telford area)

 
On 05/03/2020 10:00, militaryoperator via Groups.Io wrote:
 
Hi John,
I plan to be active as follows:
Callsign: G4BXD
Locator: IO82UJ
Bands:  1.3GHz 25W DUAL BI-QUAD
2.32GHz 20W 44 el*
Talkback: DIRECT 2Mtrs
Times: Throughout the event
 
 
 
 
Virus-free. www.avg.com


Re: UK Microwave Group - Low Band Contest - March 8th

Martyn G3UKV
 

Hi Ben
Good to hear 2m talkback is being used by some ops. I prefer it to 'KST, but needs must . . . .
I keep 144.390 monitored most of the day, so hope to catch you.
Operational 1.3, 2.3 most of day, and 3.4G for the last hour or two.
73 Martyn G3UKV
IO82RR (Telford area)

On 05/03/2020 10:00, militaryoperator via Groups.Io wrote:

Hi John,
I plan to be active as follows:
Callsign: G4BXD
Locator: IO82UJ
Bands:  1.3GHz 25W DUAL BI-QUAD
2.32GHz 20W 44 el*
Talkback: DIRECT 2Mtrs
Times: Throughout the event



Virus-free. www.avg.com


122 ghz TRA_122_002 chip

Paul G8KFW
 

 

Hi all   just a heads  up

 

Those that have ordered parts for the 122 Ghz project 

From my information 69 made up PCB’s have been ordered  for the UK

and 35 blank PCB’s for the UK

 

The last quotation I had for the  TRA_122_002  chip (November 2019) was 22.40 euro each But the shipping cost is  80 euro

 

Please note these are not available form any of the normal component suppliers

 

I personally would have preferred the UK microwave group to ordered  35 and held stock

but I do not think they intend to So I am just looking a placing an order for the

 

TRA_122_002  chips  and will be ordering 10 chips for 10 of the blank PCB’s currently on order

 

Leaving a shortfall of 25 against  blank PCB’s on order

 

Your comments please Paul

 

 

 

 

 

 

 

 


--
Paul Bicknell G8KFW   South Coast UK


FS/trade: motorised servo vane attenuator for WR90

Wilko
 

Found one of these 'projects that got stuck' today.  It is a true beauty of mechanical engineering,
a motorised WR90  vane attenuator that has a potentiometer for exact feedback. I was planning on adding 
a microcontroller to "make it tick" but alas it is unlikely I'll find time to do so.  Too many projects, so little time.

So, it is up for sale or trade for something that I can use. Location is Arnhem, the Netherlands. Local pickup is of course ok, will ship at cost.

73 Wilko
PA1WBU

Let the pictures


Re: UK Microwave Group - Low Band Contest - March 8th

John Fell
 

John,
Cardiff City centre area is full of exhibitions ,large civic buildings , waterways and masses of top end shops .
Take a bus tour and see the layout of the centre and get the history .
Cardiff was the World centre of trade in Coal at the start of the 20th Cent. and now Coal is imported from VK into it ....
Well worth the effort to visit - like much of Wales this area has seen a lot of EU funded re-development .

73
John
G0API

On Thu, 5 Mar 2020 at 10:35, John Worsnop <johnworsnop@...> wrote:
Sorry John et al. I'll be in Cardiff that day as I've paid non-returnable /non-changeable hotel and return train bookings that were originally planned for the Gnu Radio course that got cancelled due to lack of interest!

Anyone any ideas what to do in Cardiff on wet Sunday in March?

Probably just take a good book!

73 John




On Thu, 5 Mar 2020, 09:22 Phil Guttridge G3TCU, <p.guttridge@...> wrote:
Hi John,

We plan to be out as usual:

Callsign: M0HNA/P
Locator: IO91GI44
Bands: 1.3GHz 250W 67ele
2.30 & 2.32GHz 60W 0.9m dish
3.4GHz 15W 1.1m dish
Talkback: ON4KST, (23cm M0HNA-1, 9&13cm M0HNA-2) plus direct CQ on 23cm.
Times: Throughout the event


73, Phil G3TCU






On 29/02/2020 17:18, John Quarmby via Groups.Io wrote:
The first UKuG contest of 2020 takes place next Sunday 8th March, from 1000 - 1600 GMT, on the 1296, 2300, 2320, and 3400MHz bands.

Full rules are here: https://microwave.rsgbcc.org/cgi-bin/contest_rules.pl?year=2020&contest=lb_contest

I can collate information on your planned operation and produce an activity list next Saturday from inputs received up to early Saturday. Please use this format:

Callsign: G3XDY
Locator: JO02OB
Bands: 1296MHz  400W 4 x 23ele
             2300MHz  200W 0.8m dish
             2320MHz  200W 0.8m dish
             3400MHz  20W 0.8m dish
Talkback: Direct CQ on 1296MHz, ON4KST
Times: Various throughout

73

John G3XDY
UKuG Contest Manager







Re: Rotator question

alwyn.seeds1
 

Dear All,

Yes, the pot arrangement on the PSTs is not a great piece of design. I replaced the original pot with a plastic shaft Bourns type and took great care with the alignment of the assembly to avoid lateral stresses to the pot shaft. The mounting plate I use has a large hole underneath the PST, so that water cannot accumulate, despite the exposed location. So far so good.

I do wish Prosistel would re-engineer this.

Regards,

Alwyn



_____________________________________________________

Alwyn Seeds, Director
114 Beaufort Street (Management) Company Ltd.,
114 Beaufort Street,
London,
SW3 6BU

114 Beaufort Street (Management) Company Ltd., Registered in England and Wales: No. 02797775 Registered Office Address: 114 Beaufort Street, London, SW3 6BU
______________________________________________________


Re: Rotator question

Reg Woolley
 

One tip.  Get some rope,  wrap it lots of times around the pole and cage. That way you can then slide the pole back enough to get the rotor out. The rope will hold everything in place while you fix the rotor. Then you can slide the pole back in. Bit of a faff but better than a total strip down of all the aerials.

Reg G8vhi 



Sent from Samsung tablet.


-------- Original message --------
From: Graham G3TCT <g3tct@...>
Date: 05/03/2020 10:53 (GMT+00:00)
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] Rotator question

A postscript -
Thanks to all who made suggestions about the PST rotators and their pots. I managed to find a day to remove mine and replace the pot (installed 5 years ago). Martin GM6VXB suggested the Bourns pot sold by Leo Bodnar - this turned out to be the best solution - plastic shaft and better casing than the Vishay, albeit not sealed.
http://www.leobodnar.com/shop/index.php?main_page=product_info&cPath=103_81&products_id=194

Sealed ones appear in the Bourns catalog but are no longer made. I sealed mine with silicone rubber, and also mounted the rotator on washers as suggested.
I pulled the old one apart and found no damage or corrosion or water.  Measuring it with a multimeter  showed it working perfectly. So I conclude that water had got in but evaporated by the time I measured it. 
73
Graham


Re: Rotator question

Graham G3TCT
 

A postscript -
Thanks to all who made suggestions about the PST rotators and their pots. I managed to find a day to remove mine and replace the pot (installed 5 years ago). Martin GM6VXB suggested the Bourns pot sold by Leo Bodnar - this turned out to be the best solution - plastic shaft and better casing than the Vishay, albeit not sealed.
http://www.leobodnar.com/shop/index.php?main_page=product_info&cPath=103_81&products_id=194

Sealed ones appear in the Bourns catalog but are no longer made. I sealed mine with silicone rubber, and also mounted the rotator on washers as suggested.
I pulled the old one apart and found no damage or corrosion or water.  Measuring it with a multimeter  showed it working perfectly. So I conclude that water had got in but evaporated by the time I measured it. 
73
Graham


Re: UK Microwave Group - Low Band Contest - March 8th

Reg Woolley
 

If it's nice go and visit the Welsh Folk museum at St Fagans. If its rain and you have a car go to big pit. Both will apeal as they are free! Cardiff you have the Museum, a tour of the principality stadium or Cardiff Castle 

Reg g8vhi



Sent from Samsung tablet.


-------- Original message --------
From: John Worsnop <johnworsnop@...>
Date: 05/03/2020 10:35 (GMT+00:00)
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] UK Microwave Group - Low Band Contest - March 8th

Sorry John et al. I'll be in Cardiff that day as I've paid non-returnable /non-changeable hotel and return train bookings that were originally planned for the Gnu Radio course that got cancelled due to lack of interest!

Anyone any ideas what to do in Cardiff on wet Sunday in March?

Probably just take a good book!

73 John




On Thu, 5 Mar 2020, 09:22 Phil Guttridge G3TCU, <p.guttridge@...> wrote:
Hi John,

We plan to be out as usual:

Callsign: M0HNA/P
Locator: IO91GI44
Bands: 1.3GHz 250W 67ele
2.30 & 2.32GHz 60W 0.9m dish
3.4GHz 15W 1.1m dish
Talkback: ON4KST, (23cm M0HNA-1, 9&13cm M0HNA-2) plus direct CQ on 23cm.
Times: Throughout the event


73, Phil G3TCU






On 29/02/2020 17:18, John Quarmby via Groups.Io wrote:
The first UKuG contest of 2020 takes place next Sunday 8th March, from 1000 - 1600 GMT, on the 1296, 2300, 2320, and 3400MHz bands.

Full rules are here: https://microwave.rsgbcc.org/cgi-bin/contest_rules.pl?year=2020&contest=lb_contest

I can collate information on your planned operation and produce an activity list next Saturday from inputs received up to early Saturday. Please use this format:

Callsign: G3XDY
Locator: JO02OB
Bands: 1296MHz  400W 4 x 23ele
             2300MHz  200W 0.8m dish
             2320MHz  200W 0.8m dish
             3400MHz  20W 0.8m dish
Talkback: Direct CQ on 1296MHz, ON4KST
Times: Various throughout

73

John G3XDY
UKuG Contest Manager







Re: UK Microwave Group - Low Band Contest - March 8th

John Worsnop
 

Sorry John et al. I'll be in Cardiff that day as I've paid non-returnable /non-changeable hotel and return train bookings that were originally planned for the Gnu Radio course that got cancelled due to lack of interest!

Anyone any ideas what to do in Cardiff on wet Sunday in March?

Probably just take a good book!

73 John




On Thu, 5 Mar 2020, 09:22 Phil Guttridge G3TCU, <p.guttridge@...> wrote:
Hi John,

We plan to be out as usual:

Callsign: M0HNA/P
Locator: IO91GI44
Bands: 1.3GHz 250W 67ele
2.30 & 2.32GHz 60W 0.9m dish
3.4GHz 15W 1.1m dish
Talkback: ON4KST, (23cm M0HNA-1, 9&13cm M0HNA-2) plus direct CQ on 23cm.
Times: Throughout the event


73, Phil G3TCU






On 29/02/2020 17:18, John Quarmby via Groups.Io wrote:
The first UKuG contest of 2020 takes place next Sunday 8th March, from 1000 - 1600 GMT, on the 1296, 2300, 2320, and 3400MHz bands.

Full rules are here: https://microwave.rsgbcc.org/cgi-bin/contest_rules.pl?year=2020&contest=lb_contest

I can collate information on your planned operation and produce an activity list next Saturday from inputs received up to early Saturday. Please use this format:

Callsign: G3XDY
Locator: JO02OB
Bands: 1296MHz  400W 4 x 23ele
             2300MHz  200W 0.8m dish
             2320MHz  200W 0.8m dish
             3400MHz  20W 0.8m dish
Talkback: Direct CQ on 1296MHz, ON4KST
Times: Various throughout

73

John G3XDY
UKuG Contest Manager







Re: UK Microwave Group - Low Band Contest - March 8th

militaryoperator
 


Hi John,
I plan to be active as follows:
Callsign: G4BXD
Locator: IO82UJ
Bands:  1.3GHz 25W DUAL BI-QUAD
2.32GHz 20W 44 el*
Talkback: DIRECT 2Mtrs
Times: Throughout the event


Re: UK Microwave Group - Low Band Contest - March 8th

Martin - GM8IEM
 

Hi John,

I plan to be active as follows:

Callsign: GM8IEM

Locator: IO78HF

Bands:  1.3GHz 180W 60 el

2.30 & 2.32GHz 80W 67 el*

Talkback: ON4KST

Times: Throughout the event

*(only if I can get the antenna feed coax repaired before the contest – at the moment the TX output isn’t getting to the antenna.  The RX side is operational, so maybe the possibility of half points for one‐way (i.e. crossband) contacts if that remains the case?)  

The latest version of AirScout will help me to keep an eye out for aircraft scatter possibilities on multiple paths simultaneously.  Let’s hope there are some decent planes about, although the demise of Flybe doesn’t help .  I can usually work stations as far south as Yorkshire with a suitable plane, and beyond under the right conditions.

73, Martin

GM8IEM

 

-----Original Message-----
From: UKMicrowaves@groups.io On Behalf Of John Quarmby via Groups.Io
Sent: 29 February 2020 17:19
To: UKMicrowaves@groups.io
Subject: [UKMicrowaves] UK Microwave Group - Low Band Contest - March 8th

 

The first UKuG contest of 2020 takes place next Sunday 8th March, from

1000 - 1600 GMT, on the 1296, 2300, 2320, and 3400MHz bands.

 

Full rules are here:

https://microwave.rsgbcc.org/cgi-bin/contest_rules.pl?year=2020&contest=lb_contest

 

I can collate information on your planned operation and produce an activity list next Saturday from inputs received up to early Saturday.

Please use this format:

 

Callsign: G3XDY

Locator: JO02OB

Bands: 1296MHz  400W 4 x 23ele

             2300MHz  200W 0.8m dish

             2320MHz  200W 0.8m dish

             3400MHz  20W 0.8m dish

Talkback: Direct CQ on 1296MHz, ON4KST

Times: Various throughout

 

73

 

John G3XDY

UKuG Contest Manager

 

 


Re: UK Microwave Group - Low Band Contest - March 8th

Phil Guttridge G3TCU
 

Hi John,

We plan to be out as usual:

Callsign: M0HNA/P
Locator: IO91GI44
Bands: 1.3GHz 250W 67ele
2.30 & 2.32GHz 60W 0.9m dish
3.4GHz 15W 1.1m dish
Talkback: ON4KST, (23cm M0HNA-1, 9&13cm M0HNA-2) plus direct CQ on 23cm.
Times: Throughout the event


73, Phil G3TCU






On 29/02/2020 17:18, John Quarmby via Groups.Io wrote:
The first UKuG contest of 2020 takes place next Sunday 8th March, from 1000 - 1600 GMT, on the 1296, 2300, 2320, and 3400MHz bands.

Full rules are here: https://microwave.rsgbcc.org/cgi-bin/contest_rules.pl?year=2020&contest=lb_contest

I can collate information on your planned operation and produce an activity list next Saturday from inputs received up to early Saturday. Please use this format:

Callsign: G3XDY
Locator: JO02OB
Bands: 1296MHz  400W 4 x 23ele
             2300MHz  200W 0.8m dish
             2320MHz  200W 0.8m dish
             3400MHz  20W 0.8m dish
Talkback: Direct CQ on 1296MHz, ON4KST
Times: Various throughout

73

John G3XDY
UKuG Contest Manager







Re: ADF5355 Synthesizer

Andy G4JNT
 

Status update. 
 I now have PIC code (16F628) for controlling this chip in 10Hz steps over its full range from a rotary encoder + pushbuttons with LCD, along with a keypad for direct frequency entry.   (Strictly speaking, it uses two PICs.   The keypad has its own 16F688 and communicates with the main controller over a two wire interface - it was simpler that way)

I'll write it all up as soon as I've packaged everything and completed my hardware into a single box,  but it's working straggled all over the bench at the moment.  Anyone who wants an advance copy of the PIC source code for  your own use, please contact me.  It'll be on the website when fully documented.

BTW, the frequency will be subject to a very minor systematic frequency setting error.  Although this is a PLL synthesizer, which would normally result in exact settings for output frequency given a 'perfect' reference and a frequency tuning grid, this particular chip is programmed more like a DDS and is subject to a quantisation error.  In this case it amounts to rounding a 37 bit word representing the wanted frequency with 80MHz Fcomp so something of the order of 0.0006Hz.     See RadCom Dec 2018 page 44 for a detailed explanation of the maths behind programming this device.  (Hint,  here D2 = 8192) 





On Fri, 31 Jan 2020 at 17:03, Dave G8GKQ <dave.g8gkq@...> wrote:

Hi Andy

 

I have used one as a local oscillator driver (at 11.8 GHz) in my 24 GHz Transverter for the last year.  I recently replaced it with a Nort SLO https://wiki.microwavers.org.uk/Nort_SLO which has higher output, but a more limited frequency range.

 

The output level on my Chinese eBay ADF5355 board was of course lower than the spec sheet, but in all other areas its performance was as expected.  It took quite a lot of playing to get the phase noise to acceptable levels for both SSB and DATV (good for one does not necessarily mean good for the other).  I initially put high value electrolytics (in parallel with low ESR ceramics) on the supplied regulators, but later replaced them with Brian GM8BJF’s excellent low noise PSU PCB https://gm8bjf.joomla.com/past-talks/15-reducing-phase-noise-pn-on-chinese-adf5355-boards.  I also set the maximum charge pump current possible and used the in-built doubler for the on-board reference frequency.

 

I started work on driving it from the touchscreen signal generator that is built into the Portsdown DATV system (currently using an ADF4351), but got distracted before I had finished.  In fact the button labelled ADF5355 now sets up an Elcom synth driver (must correct that....).

 

After initial tests using a Raspberry Pi to send the spi commands, I then used a simple PIC circuit https://wiki.batc.org.uk/ADF435x_PIC for single-frequency operation.

 

The price of the bare boards appears to have risen from £65 to £90+, but as I already have one, I would be interested in (PIC) code to control it in a flexible fashion.  It’s one of those things that I have wanted to design, but there is always something more important!

 

I have no experience of the Chinese controllers.

 

Dave, G8GKQ

 

From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of Andy G4JNT
Sent: 31 January 2020 13:24
To: UK Microwaves groups.io
Subject: [UKMicrowaves] ADF5355 Synthesizer

 

What is the current state / Am radio usage of this synthesizer chip? And where have people got in evaluating it?   I know there are a number of Chinese made Touchscreen / OLED controllers out there, but are they any good.

 

I started looking at this chip in the latter half of 2017, but a certain medical diagnosis sort of made me ignore projects underway at that time and kick start new ones.   Now just slowly looking back through the junk box and computer records,  picking up a few that seem worth pursuing and which chucking.  This seems one of them for restarting

 

Looking at adapting a PIC controller based on the ADF4351 with pushbutton and rotary control + LCD.   Any interest, or have the Chinks done it all well enough to just buy and forget?

 

 

Andy

 


Re: Mystery antennas

Chris G8BKE
 

Yes Andy,  i was getting round to thinking that Lymington was a possibility since you mentioned the possible maritime connection.

Maybe a sortie to Lymington one day is in order. ;-)

73