Date   

Re: Phase Centre of WiFi dongle

Murray Niman
 


Plenty of small ceramic antennas around...
Look on here and you will see similar:-

https://uk.farnell.com/c/passive-components/antennas-single-band-chip

Their physical size vs freespace wavelength may not be uber-efficient though, but for short range WiFi or bluetooth it doesnt matter much

  Murray


Re: Phase Centre of WiFi dongle

Glyn M0XGT
 

I think it’s always going to be slightly tricky relying on the internal antenna in the dongle – better to either hack the board and connect via the test connector or use a device that has external antenna connectors. 
 
The solution I like is a Ubiquiti Bullet M5, or dual-chain Rocket M5, with external N-type or SMA (after RP-SMA adaptors) connectors and an Ethernet connection to a 24V POE switch or POE injector plus 24V DC-DC converter and LiPo. This lets you put the access point at the top of a mast with data and power run over a long outdoor Ethernet cable, and it leaves you with just a short coax run to the antenna ports. I get the ubiquity kit on eBay, new from Latvia or used from UK/EU.
 
I have a collection of different antennas depending on the task: 6 dBi or 8 dBi omnis for UAV ground-to-air links or general area coverage, a pair of 18 dBi patches for moderate distance, and a pair of 28 dBi dual-polarised dishes for much long point-to-point links. For short range links you can push the data-link channel bandwidth right up (300 Mb/s with 40 MHz channels, dual-chain) or dial it down to increase the range. 
 
Glyn M0XGT  
 


Re: Phase Centre of WiFi dongle

John E. Beech
 

Tnx Glynn,
I did do some tests a few years ago which showed some promise. I used a Sky/Amstrad elliptical dish (
designed for 11 GHz, so reduced gain at 2.45 GHz about 20 dB) at one end with a helical feed antenna and about
10 ft of RG58 with an SMA connector on one end to connect to the Wifi card in a desktop PC. The other end of
the link had a
60 cm diam Grampian outside broadcast microphone dish ( also about 20 dB, which I had previously used on 3 cm
WBFM) with the dongle at/near the focus. It worked over the length of my garden - hardly surprising as the distance
was only 130 feet! The "normal" wifi set-up dropped out at that distance.
I then tried it at a range of about 1 km ie between my QTH & Coventry ARS QTH with mixed results. The
path should be line of sight, across a valley, but it is obstructed. The only place I could detect it was 50 yards up the
drive (inconvenient) from the club house ( church hall). At the time I chose "middle for diddle" as far as dongle/dish
focus went.
However, since then one of the obstructions to wit a 120 ft tall Lombardy Poplar tree at the bottom of my
garden has gone - blown down in a gale and sawn up for firewood. So I thought I might try again, but this time
optimising the system a bit better. And perhaps I might get it to work via a reflectin path as there are a number of
high rise buildings dotted about the area.

de John G8SEQ

-------Original Message-------
From: Glyn M0XGT <glyn.thomas512@gmail.com>
To: UKMicrowaves@groups.io <UKMicrowaves@groups.io>
Subject: Re: [UKMicrowaves] Phase Centre of WiFi dongle
Sent: Mar 07 '21 17:15

It's usually at the far end opposite the USB connector (along with a
u.fl test connector that you can hack).
What sort of link distance are you aiming for?

Glyn M0XGT


Re: Phase Centre of WiFi dongle

John E. Beech
 

Tnx fer that Peter,
Is that white ceramic thing really an antenna for 2.45 GHz. I've never seen one like that &
wouldn't have recognised it as an antenna. Or is it a matching device or phase shifting device for a track on the
other side of the PCB that acts as an antenna. I'm thinking circular / mixed polarization. There is some symmetry to
the board which suggests there may be two antennas at right angles, if you look at the bottom LH corner of the
board.

de John G8SEQ

-------Original Message-------
From: Peter Burgess via groups.io <g4bch=yahoo.com@groups.io>
To: ukmicrowaves@groups.io <ukmicrowaves@groups.io>
Subject: Re: [UKMicrowaves] Phase Centre of WiFi dongle
Sent: Mar 07 '21 18:09

Hi John

A google search for D-link DWL-G122 H/W pcb brought up an image of a
dissasmbled unit.

http://studycasini.dx.am/d-link-dwl-g700ap-drivers-for-mac.html image
near the bottom of the page.

It looks like it uses a small ceramic chip antenna under the Act LED
label.

Peter
G4BCH


Re: Phase Centre of WiFi dongle

Peter Burgess
 

Hi John

A google search for D-link DWL-G122 H/W pcb brought up an image of a dissasmbled unit.
It looks like it uses a small ceramic chip antenna under the Act LED label.

Peter
G4BCH


Re: Phase Centre of WiFi dongle

Glyn M0XGT
 

It's usually at the far end opposite the USB connector (along with a u.fl test connector that you can hack). 
What sort of link distance are you aiming for?

Glyn M0XGT 


Phase Centre of WiFi dongle

John E. Beech
 

Hi All,
Anyone any idea od where the phase centre of the antenna inside a wiFi Dongle might be? Specifically a D-link
DWL-G122 H/W. It is 60 mm high excluding the USB connector.

I'd like to be in or near the ball bark with my mounting, as I don't have much adjustment once it is fitted to my dish f/D
ratio about 0.3. I'm trying to extend the range for a point-to-point connection.

de John G8SEQ


Re: Mast head preamp box wanted

Michael Scott
 

Hi Rich

I think I have a couple which I bought years ago and have never used, and you can have them for the cost of postage if that helps.

73, Mike, G3LYP.

On 06/03/2021 16:42, G8ZHA via groups.io wrote:

I am looking for a suitable box for a mast mounted preamp.

 

One such as the SHF-Electroink  type as shown on the attached picture.

 

I did manage to pick one up from a rally a few years ago – does anyone know who sells them?

 

Rich G8ZHA


Re: GB3KBQ

Adrian G4UVZ
 

Thanks both ...I think thatthe rainey season is on it's way again so that should help propogation!!

A


Re: Contest 7th March

Noel G8GTZ
 

I intend to be on 13 and 9cms from around 12 noon.

73
Noel - G8GTZ


Re: Mast head preamp box wanted

G8ZHA
 

Just what I need. Many thanks. Rich.

 

From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of Peter G3SMT via groups.io
Sent: 06 March 2021 16:49
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] Mast head preamp box wanted

 

Rich,

Have a look here :-  https://g3nyk.ham-radio-op.net/componen.htm

Alan has the enclosures that you are looking for and is most helpful.

73

Peter  G3SMT

 

On 06/03/2021 16:42, G8ZHA via groups.io wrote:

I am looking for a suitable box for a mast mounted preamp.

 

One such as the SHF-Electroink  type as shown on the attached picture.

 

I did manage to pick one up from a rally a few years ago – does anyone know who sells them?

 

Rich G8ZHA


--
Peter G3SMT


Re: Mast head preamp box wanted

Peter G3SMT
 

Rich,

Have a look here :-  https://g3nyk.ham-radio-op.net/componen.htm

Alan has the enclosures that you are looking for and is most helpful.

73

Peter  G3SMT


On 06/03/2021 16:42, G8ZHA via groups.io wrote:

I am looking for a suitable box for a mast mounted preamp.

 

One such as the SHF-Electroink  type as shown on the attached picture.

 

I did manage to pick one up from a rally a few years ago – does anyone know who sells them?

 

Rich G8ZHA


--
Peter G3SMT


Re: GB3OSW

geoffrey pike
 

Hi Peter,
Thanks for that, i seem to remember Tony mentioned it may be a problem, just need more reflective metal in the sky!
thanks
Geoff
GI0GDP


On Saturday, 6 March 2021, 11:01:14 GMT, Peter G3SMT via groups.io <peter.torry@...> wrote:


Hi Geoff,

I do have rising ground to the West of me and I do have some difficulty in working GI on 23cm so I would imagine that 10G reception would be rather remote unless there are some reflective paths.

Regards

Peter  G3SMT



On 06/03/2021 09:57, geoffrey pike via groups.io wrote:
How clear is its path to GI?
cheers
Geoff
GI0GDP

On Saturday, 6 March 2021, 08:19:37 GMT, Martyn G3UKV <ukv@...> wrote:


Re-send of yesterday's mail which didn't seem to arrive here . . . .
Martyn

-------- Forwarded Message --------
Subject: GB3OSW
Date: Fri, 5 Mar 2021 12:33:30 +0000
From: Martyn Vincent <ukv@...>
To: UKMicrowaves@groups.io


Welcome back beacon GB3OSW (IO82KV80) on 3cm - 10368.780 MHz.
Not many spotters so far on beaconspot.uk - so have a listen if possible.
Thanks Peter (G3SMT - beacon NoV).
73 Martyn G3UKV

Virus-free. www.avg.com

--
Peter G3SMT


Mast head preamp box wanted

G8ZHA
 

I am looking for a suitable box for a mast mounted preamp.

 

One such as the SHF-Electroink  type as shown on the attached picture.

 

I did manage to pick one up from a rally a few years ago – does anyone know who sells them?

 

Rich G8ZHA


Re: Nano VNA SAA-2N and G3XDY QRO filter

Dave G1EHF
 

The VNA SAA-2 series use the ADF4350 as source oscillators, which in theory will go to 4.4 GHz. Mine goes easily to 4 GHz, although the noise floor does start to increase above 3 GHz. That said, it can characterise a 9 cm filter or antenna easily if you're not after 70 dB of dynamic range!

73, Dave G1EHF


Re: GB3MCB current frequency?

Dave G1EHF
 

I intend to get GB3GCT installed and running once the COVID-related access restrictions are lifted from the tower.

It''ll be on 10368.935 MHz from IO91IJ51 and run PI4.

I'll announce on here when it's going.

73, Dave G1EHF


Re: GB3OSW

Peter G3SMT
 

Hi Geoff,

I do have rising ground to the West of me and I do have some difficulty in working GI on 23cm so I would imagine that 10G reception would be rather remote unless there are some reflective paths.

Regards

Peter  G3SMT



On 06/03/2021 09:57, geoffrey pike via groups.io wrote:
How clear is its path to GI?
cheers
Geoff
GI0GDP

On Saturday, 6 March 2021, 08:19:37 GMT, Martyn G3UKV <ukv@...> wrote:


Re-send of yesterday's mail which didn't seem to arrive here . . . .
Martyn

-------- Forwarded Message --------
Subject: GB3OSW
Date: Fri, 5 Mar 2021 12:33:30 +0000
From: Martyn Vincent <ukv@...>
To: UKMicrowaves@groups.io


Welcome back beacon GB3OSW (IO82KV80) on 3cm - 10368.780 MHz.
Not many spotters so far on beaconspot.uk - so have a listen if possible.
Thanks Peter (G3SMT - beacon NoV).
73 Martyn G3UKV

Virus-free. www.avg.com

--
Peter G3SMT


Re: GB3OSW

geoffrey pike
 

How clear is its path to GI?
cheers
Geoff
GI0GDP

On Saturday, 6 March 2021, 08:19:37 GMT, Martyn G3UKV <ukv@...> wrote:


Re-send of yesterday's mail which didn't seem to arrive here . . . .
Martyn

-------- Forwarded Message --------
Subject: GB3OSW
Date: Fri, 5 Mar 2021 12:33:30 +0000
From: Martyn Vincent <ukv@...>
To: UKMicrowaves@groups.io


Welcome back beacon GB3OSW (IO82KV80) on 3cm - 10368.780 MHz.
Not many spotters so far on beaconspot.uk - so have a listen if possible.
Thanks Peter (G3SMT - beacon NoV).
73 Martyn G3UKV

Virus-free. www.avg.com


GB3OSW

Martyn G3UKV
 

Re-send of yesterday's mail which didn't seem to arrive here . . . .
Martyn

-------- Forwarded Message --------
Subject: GB3OSW
Date: Fri, 5 Mar 2021 12:33:30 +0000
From: Martyn Vincent <ukv@...>
To: UKMicrowaves@groups.io


Welcome back beacon GB3OSW (IO82KV80) on 3cm - 10368.780 MHz.
Not many spotters so far on beaconspot.uk - so have a listen if possible.
Thanks Peter (G3SMT - beacon NoV).
73 Martyn G3UKV

Virus-free. www.avg.com


Contest 7th March

John Lemay
 

'Morning all

The UK Microwave Group has the first "Low Band" contest tomorrow; Sunday 7
March from 10:00 to 16:00. The Low Bands are 23, 13 and 9cms.

The first 4 hours coincide with an IARU event.

I'm planning to be active on all three bands throughout the contest period.
Hope to work many of you !

Regards

John G4ZTR
JO01KW


--
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