Date   
Re: Millimetre Contest 15th September

G1DFL
 


I plan to be out on 24GHz roving between two sites. Taking 70MHz SSB for the 4M AFS contest from the last location. 

Realistically first site only good to M3 Basingstoke, Farleigh Wallop and Walbury. Second site much better to Walbury plus potential for sites to the West (Hackpen, Cleeve etc) and North (Dassett, Bar Beacon etc).


Callsign: G1DFL/P
Location: 1) IO91NM78 (Remenham Hill), then 2) IO891LO98 (Britwell Hill)
Band: 24GHz SSB and NBFM, 0.25W, 30cm Dish
Talkback: 144.390MHz SSB, 07713 432632, ON4KST, Zello (SHF Chat)
Times: 11:30ish till 2pm

Have fun in the sun!

Regards..Pete
G1DFL



On Saturday, September 14, 2019, 06:23:51 AM GMT+1, Barry Lewis via Groups.Io <barryplewis@...> wrote:


Hopefully 24GHz from Walbury Hill IO91GI44 from around 10:30 onwards.
UKuG loan gear, 10mW output power.
Talkback 2m and KST.
73
Barry G4SJH

Re: Millimetre Contest 15th September

Barry Lewis
 

Hopefully 24GHz from Walbury Hill IO91GI44 from around 10:30 onwards.
UKuG loan gear, 10mW output power.
Talkback 2m and KST.
73
Barry G4SJH

Re: Power rating Sanders attenuator

Nick Gregory G0HIK
 

ok thanks Alan, I'll keep a look out for higher power ones.
Nick G0HIK


Fri, Sep 13, 2019 at 11:25 PM, Alan Melia wrote:
Hi Nick, There is a 10W version in the series but the fins are about twice the diameter of those, looking at the pics in the catalogue.
 
Alan
G3NYK
----- Original Message -----
Sent: Friday, September 13, 2019 10:47 PM
Subject: Re: [UKMicrowaves] Power rating Sanders attenuator
 
Thank you Alan,
I was hoping that the larger one was rated at 10w, but that will do nicely with my current power levels.
Nick G0HIK 

 OK thanks

Re: Power rating Sanders attenuator

Alan Melia
 


Hi Nick, There is a 10W version in the series but the fins are about twice the diameter of those, looking at the pics in the catalogue.
 
Alan
G3NYK

----- Original Message -----
Sent: Friday, September 13, 2019 10:47 PM
Subject: Re: [UKMicrowaves] Power rating Sanders attenuator

Thank you Alan,
I was hoping that the larger one was rated at 10w, but that will do nicely with my current power levels.
Nick G0HIK 

Re: Power rating Sanders attenuator

Nick Gregory G0HIK
 

Thank you Alan,
I was hoping that the larger one was rated at 10w, but that will do nicely with my current power levels.
Nick G0HIK 

Re: Power rating Sanders attenuator

Alan Melia
 


Hi Nick 1990 catalogue....bothe 5w average DC to 18GHz
 
Alan
G3NYK

----- Original Message -----
Sent: Friday, September 13, 2019 9:41 PM
Subject: [UKMicrowaves] Power rating Sanders attenuator

I hoping to be picking up an old Marconi power meter shortly.
I  would like to use the two MI Sanders  attenuators that I  currently have. I  can't find them listed does anyone know their power rating..
The larger one is 6535.3.
the smaller one is 6534.1

Thank you

Nick G0HIK

Power rating Sanders attenuator

Nick Gregory G0HIK
 

I hoping to be picking up an old Marconi power meter shortly.
I  would like to use the two MI Sanders  attenuators that I  currently have. I  can't find them listed does anyone know their power rating..
The larger one is 6535.3.
the smaller one is 6534.1

Thank you

Nick G0HIK

Martlesham 2019 Talks now available to watch on MMRT YouTube Channel

Mark M5BOP
 

Hi All,

Following requests by several amateurs, the complete set of technical talks from this year's Martlesham Microwave Round Table is now available to watch on our YouTube channel - you can navigate there by using the following web shortcut:

http://www.hisimage.tv/mmrt/

Over coming weeks we plan to add talks from previous years, having delved into our archives, so if you enjoy what you see please Subscribe to our channel - that way you'll receive a notification when new videos are added!  Let me know if there is anything in particular from previous years that you'd like to see again!

Please contact me if you have any problems viewing the content

73,
Mark, M5BOP

MMRT 2019 talks added this week:
  • Practical GNUradio - Heather Lomond M0HMO
  • From Death Rays to Dinner - William Eustace M0WJE
  •  Equip for Es'hail-2 Narrowband - David Bowman G0MRF
  • DATV on Es'hail-2 - Noel Matthews G8GTZ
  • Low-pass Harmonic Filter for 23cm - John Quarmby G3XDY

CCTV security cameras via 2.4Ghz PTP links

LucL
 

HI, i am new here, and in the search for micro wave enthousiasts wiling to provide me with  some advice and their opinions concerning microwave (2.4 and 5.0 ghz) data links used for urban cctv camera observation projects.

Re: Farnham 3.4GHz Beacon Test

Dave G1EHF
 

Thanks for the report John. I believe that the TV repeater antenna is nominally omni-directional but being a slotted waveguide it could have a null in your direction. Noel will be investigating the beacon power level again next week. The concept was to try and create an almost zero-cost, narrow-band beacon but it cannot be to the detriment of the ATV signal.

73, Dave G1EHF

Re: Up Converter, another ide?

Chris Bartram G4DGU
 


On 12/09/2019 20:25, Paul Bicknell wrote:

Hi Graham

 

Just spotted your link to control a 4351 with an Arduino


I have just bought another 2  to build 2 up converters but thought I was going to have to ask a friend to program a pick for me

 

Just one note of caution from feed back relating to ADF 4351  not the component part but assembled on a PCB there are a lot of variations in performance 

 

so could this be the same with other ADF series  such as 4353  and 4355

 

The PCBs for all synthesiser chips with on-board VCOs are a pig to lay out for the best phase noise and discrete spurious signal levels. It's always not easy to choose divider ratios to get the best performance. The SV1AFN ADF4351 board seems to be a particularly good example, and I've had more than adequate performance from one multiplied to 10GHz. The 10quid boards from China seem to work, but the PCB layout could often do with serious revision.  Most synthesiser devices similar to the AFD4351 can give good performance, but they all have their quirks, and it's essential to read the data sheet, and to fully understand it before playing.  That can often be an excellent path to a headache!

Incidentally, modern synthesisers tend to need a clock at significantly higher frequencies than 10MHz. The use of 10MHz can also be a recipe for poor performance.

73

Chris

G4DGU

Re: Up Converter, another ide?

Paul G8KFW
 

Hi Graham

 

Just spotted your link to control a 4351 with an Arduino

I have just bought another 2  to build 2 up converters but thought I was going to have to ask a friend to program a pick for me

 

Just one note of caution from feed back relating to ADF 4351  not the component part but assembled on a PCB there are a lot of variations in performance 

 

so could this be the same with other ADF series  such as 4353  and 4355

 

Paul

 


From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of Graham G3TCT
Sent: 12 September 2019 11:55
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] Up Converter, another ide?

 

Ben
I don't know about that product, but thought you said you already have a ADF4351 synth.  In which case, see this page on how to control with an Arduino.
http://www.g3tct.co.uk/ADF4351.html
HTH

Graham

On Thu, Sep 12, 2019 at 10:39 AM, militaryoperator wrote:

283595161793

No virus found in this message.
Checked by AVG - www.avg.com
Version: 2016.0.8048 / Virus Database: 4793/15884 - Release Date: 08/14/18
Internal Virus Database is out of date.


--
Paul Bicknell G8KFW   South Coast UK

Re: 13cm beacons

Martyn G3UKV
 

Ah - thank you John.
I had almost convinced myself it was QRT. Geoff (NoV holder) will be relieved to read your mail.
Still not hearing it here. Need some rain scatter or something. I'll listen again this evening.
Surprisingly few reports of 13cm beacons on Beaconspot - which is a really valuable resource.
73 Martyn G3UKV

On 12/09/2019 11:45, John Lemay wrote:

GB3LES on 13cms is audible here in JO01. It’s not strong, but that is normal.

 

John G4ZTR

 

From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of Dave G4RGK .
Sent: 11 September 2019 15:35
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] 13cm beacons

 

I checked it again at 12z today, I cant hear it either.

73 Dave G4RGK

 

On 11/09/2019 11:47, G4LDR via Groups.Io wrote:

Hello Martyn,

Just checked the Farnham beacon, GB3FNM on 2320.920MHz and I can't hear it, normally 599+++ here. Not hearing the Leicester Beacon GB3LES on 2320.955MHz but don't monitor it very often. I'm hearing GB3SCS at 599 so 13cm RX is working here. I am hearing GB3LEX on 10368.955 at 419 at the moment.

73 Neil G4LDR


Re: Farnham 3.4GHz Beacon Test

John-G8ACE
 

Pretty weak in Winchester on a 90cm dish. About on a par with ZME for strength and that comes over Walberry.
No info on the antenna that I see so could be the main lobe is some other way than Winchester.
Its many dbs weaker than FNM 6cms on the adjacent site.
I think the drift shown is likely my PC/Rx as it hasnt been used since the last time but it is a strength guide.
John G8ACE

Re: Any microwavers in Anglesey??

Ron
 

Currently near Aberffraw in IO73TE16 but no 23cm gear with me.

I will be back a couple of times next year to the same area and hope to have built some 10GHz by then, failing that I'll try to get a loaner.

Ron G6BMY

On 12/09/2019 10:42, militaryoperator via Groups.Io wrote:

Just wondered if we have any uW'ers up in Anglesey??

Ben.


Virus-free. www.avg.com

Re: Any microwavers in Anglesey??

Keith
 

Sorry 70 cms was 10 years later Doh !! :(

Re: Any microwavers in Anglesey??

Keith
 

Spent my honeymoon there in 1974, but only had 70 cms with me ;)
Still one of my favourite places on the planet, especially Moelfre :)
Hope you find someone local :)
Cheers
Keith VK6EME

Re: Increasing output of pll synth

Stuart G1ZAR
 

Thanks for the suggestion Dave.
After a few emails with the vendor he has selected one that is within my required range.

73, Stuart

Re: Programming the ADF4351

militaryoperator
 

Subject: [UKMicrowaves] Programming the ADF4351

There is a very useful guide to programming the ADF4351 on the BATC Wiki: https://wiki.batc.org.uk/ADF435x_PIC.  A simple approach using a PIC. 
 
Note that the integrated oscillators and programmers may not always generate the best available signal – it may not be optimised for low phase noise (if that’s what you want).
 
Dave, G8GKQ
_._,_._,_


I'm sure its not hard Dave but, as well as getting the osc board, I would need an Ardy thing or a PIC etc etc. 

Would be a lot easier if like the LeoBod unit one just downloaded a small program on Windows and plugged in the usb lead. It takes seconds that way without having to buy another tiny computer and learn another language, hi. 

Seems I might be able to buy it already set from the Greek chappy.

Ben

Re: Up Converter, another idea?

militaryoperator
 


Ben
I don't know about that product, but thought you said you already have a ADF4351 synth.  In which case, see this page on how to control with an Arduino.
http://www.g3tct.co.uk/ADF4351.html
HTH
Graham


The one I have has a controller on it with a small lcd screen. The o/p at 1968MHz is very spiky, lots of sprogs it appears. 

DSCF1073.JPG

Have been told to try and add C around the regulator so will try that. 

cheers, Ben.