First UK QSO on the 122 GHz band


Chris G0FDZ
 

The first UK QSO on the 122 GHz band took place yesterday the 17th of July at 13:45 hours UTC between Roger G8CUB/P and Chris G0FDZ/P with both stations located at Hackpen, Wiltshire  (IO91CL). The distance was 120m and the CW reports were 599 both ways. An earlier attempt at 5km failed for a two way QSO. As well as signals on 134 GHz, of which only a very weak one way QSO was possible on that band, only the merest hint of a signal on 122 GHz was heard. The 122 GHz band is noted for its high signal attenuation due additionally to atmospheric oxygen as well as water vapour attenuation. The weather during the contest gave high humidity, and absorption of all millimetre wave frequencies was considered by many to be high. Although signals over the short distance were very good an attempt will be made soon over 1.5kms. Power levels were 70uW for Chris G0FDZ & 300uW for Roger G8CUB. One feature of G0FDZ’s system was the use of a slab type mixer which has been recently developed to make millimetre wave mixers easier to construct.

With a QSO being achieved on this band it means that every allocated UK band has now has had at least one QSO.

A full report on the QSO and progress will appear in the UK Microwave Groups Scatterpoint newsletter, and photos and video will be available soon.

Regards

Chris G0FDZ


Christopher Bartram <cbartram@...>
 

Well done guys!

Yes, yesterday was plagued by gas losses. With RH at very close to 100% here, even a test from home to Clee Hill on 24GHz failed ...

Keep up the good work!

73

Chris
GW4DGU

--
Christopher Bartram MIET
Christopher Bartram RF Design
Llygad yr Haul
Carno
CAERSWS
Powys SY17 5LE

phone: +44 1686 237732
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g4bao
 

Nice one Chris and Roger, just in time for September "GHz bands"

If anyone else has news of note, I'm starting to write the column this week.

73
John

On 18 July 2016 at 08:40, Christopher Bartram cbartram@... [ukmicrowaves] <ukmicrowaves@...> wrote:
 

Well done guys!

Yes, yesterday was plagued by gas losses. With RH at very close to 100%
here, even a test from home to Clee Hill on 24GHz failed ...

Keep up the good work!

73

Chris
GW4DGU

--
Christopher Bartram MIET
Christopher Bartram RF Design
Llygad yr Haul
Carno
CAERSWS
Powys SY17 5LE

phone: +44 1686 237732
mobile: +44 7545 094490
email: cbartram@...
URL: www.christopherbartramrfdesign.com

Note: This message is for the named person's use only. It may contain confidential, proprietary or legally privileged information. No confidentiality or privilege is waived or lost by any mistransmission. If you receive this message in error, please immediately delete it and all copies of it from your system, destroy any hard copies of it and notify the sender. You must not, directly or indirectly, use, disclose, distribute, print, or copy any part of this message if you are not the intended recipient. Christopher Bartram RF Design reserves the right to monitor all e-mail communications through its network. Any views expressed in this message are those of the individual sender, except where the message states otherwise and the sender is authorised to state them to be the views of any such entity.



Barry Chambers
 

Hi Chris, Roger

Another fantastic achievement! Well done.

73

Barry, G8AGN
On 18/07/2016 08:29, Chris G0FDZ chris@... [ukmicrowaves] wrote:

 

The first UK QSO on the 122 GHz band took place yesterday the 17th of July at 13:45 hours UTC between Roger G8CUB/P and Chris G0FDZ/P with both stations located at Hackpen, Wiltshire  (IO91CL). The distance was 120m and the CW reports were 599 both ways. An earlier attempt at 5km failed for a two way QSO. As well as signals on 134 GHz, of which only a very weak one way QSO was possible on that band, only the merest hint of a signal on 122 GHz was heard. The 122 GHz band is noted for its high signal attenuation due additionally to atmospheric oxygen as well as water vapour attenuation. The weather during the contest gave high humidity, and absorption of all millimetre wave frequencies was considered by many to be high. Although signals over the short distance were very good an attempt will be made soon over 1.5kms. Power levels were 70uW for Chris G0FDZ & 300uW for Roger G8CUB. One feature of G0FDZ’s system was the use of a slab type mixer which has been recently developed to make millimetre wave mixers easier to construct.

With a QSO being achieved on this band it means that every allocated UK band has now has had at least one QSO.

A full report on the QSO and progress will appear in the UK Microwave Groups Scatterpoint newsletter, and photos and video will be available soon.

Regards

Chris G0FDZ


mjniman@...
 


Congrats on another mmWave first!

Whilst we have often not favoured the 122GHz band due to the Oxgyen resonance losses (similar to the 60 GHz band)  - all activity counts! - and like the exempt 60Ghz band is expected to see a growth in new chips and short range devices

73

 Murray G6JYB

PS Video/pics welcome of course!