Date   
Re: Farnham 3.4GHz Beacon Test

G4LDR
 

Hi Dave,

Further to my post of a few minutes ago, I've just checked the 6cm Farnham beacon and it is 599++ (virtually end stop) so there is a lift on at the moment. I'll monitor the 9cm beacon over the next few days and see what strength it is under flat band contitions.

73 Neil G4LDR.

Re: Farnham 3.4GHz Beacon Test

G4LDR
 

Hello Dave,

Just got round to listening for the new Farnham 3.4GHz Beacon.

It is currently 599 and a fairly steady signal (tower in lowered position and beaming straight into the trees that screen the lower part of the tower). I'm 61km from the beacon and it is a quite an obstructed path. Frequency measured here is 3400.740500MHz. I'm able to hear it no matter which way the dish is pointing. Hope it becomes a permanent feature. (For reference the 13cm beacon is 599++ and the 6cm beacon from the other Farnham site is usually only 519 ish).

Thanks for getting it on the air.

73 Neil G4LDR

Re: Millimetre Contest 15th September

David Robinson
 

I was at Io82lb this afternoon for the batc datv lowband contest, on 24g zme was loud on open waveguide so that band seems to work, not so convinced about my 47g system though
Will be qrv on 24 at 1200z when 4m afs finishes

Dave
G4fre/p

Re: Millimetre Contest 15th September

Roger Ray
 

I will be at Hackpen for longer, as the second location has too many trees. Likely I will move somewhere later.
Roger
G8CUB

Re: Millimetre Contest 15th September

Keith GW3TKH
 

Pete and I will be QRV form the usual place, IO81LS19. Both with 24, 47 and 76GHz.

Time from 0900 UTC, talk back via 144.390, KST, 07762885015.

73 Keith
GW3TKH



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Re: Millimetre Contest 15th September

G4LDR
 

I should be QRV on 24, 47 and 76GHz.

Probable locations are Salisbury Plain area and south west Hampshire.

Times from about 09:00UTC.

Talkback, mainly 144.390 (+/- QSY), and possibly KST.

73 Neil G4LDR

Spectrum analysers

Michael Scott
 

Hi All
 
All the SA units have been claimed, sorry!
 
Mike

Re: 122GHz Chip Transceiver

Andy G4JNT
 


On Sat, 14 Sep 2019 at 12:20, Andy G4JNT via Groups.Io <andy.g4jnt=gmail.com@groups.io> wrote:
Interesting article in the latest Dubus about a Siliconradar chip used as a transceiver for 122GHz

The chip itself has a VCO (with output at 1.9GHz from an internal  prescaler) , 0.5mW PA , LNA and quadrature downconversion to 0 - 200MHz IF

By adding of a Fract-N synth the chip can be locked and you have a standalone 122GHz transceiver for CW and any modulation  that can be done by changing the frequency .   A modern Fract-N with tiny frequency resolution will allow quite narrow step size.

Downside is, it has separate Tx and Rx antennas so mounting on a dish is problematical.   The chip can be physically shifted between Tx/Rx, or the authors have designed a combiner.

Interesting ....

122GHz Chip Transceiver

Andy G4JNT
 

Interesting article in the latest Dubus about a Siliconradar chip used as a transceiver for 122GHz

The chip itself has a VCO (with output at 1.9GHz from an internal  prescaler) , 0.5mW PA , LNA and quadrature downconversion to 0 - 200MHz IF

By adding of a Fract-N synth the chip can be locked and you have a standalone 122GHz transceiver for CW and any modulation  that can be done by changing the frequency .   A modern Fract-N with tiny frequency resolution will allow quite narrow step size.

Downside is, it has separate Tx and Rx antennas so mounting on a dish is problematical.   The chip can be physically shifted between Tx/Rx, or the authors have designed a combiner.

Interesting ....

HP141T Spectrum analysers

Michael Scott
 

Hi All
 
I have two HP141T base units and the following plug-ins: 2 x 8552B IF units, 1 x HP8553 RF unit ( 0-110MHz ) and 1 x HP8544A RF unit ( 0-18GHz ). All were working until recently but have now failed. Other than checking fuses, I haven’t done any serious investigation into the cause of the failure. I have manuals for all, either original or photocopies.
 
If anyone is willing to come and collect them and carry them out to their vehicle, they can have them for free. Even with the plug-ins removed they are heavy and I am not prepared to carry them!
 
If you are interested, please contact me direct.
 
73, Mike, G3LYP.

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