Date   

Re: F/GM0USI/P IN78/88 3cm next week

John McCarthy
 

Yep you've picked a week of good weather Wednesday is good for me, have to be somewhere in the morning but should be done by lunch so will head straight over to lane end 
73 John


On Mon, 18 Jul, 2016 at 16:28, Alan Dimmick dimmickalan@... [ukmicrowaves]
wrote:
 

Hi there,

Have arrived in the Roscoff area and am staying for a week in St Pol de.Leon just to the south...wx looks extremely warm tomorrow so thinking Wednesday around 13-1500local...local time here is 1 hour ahead...
I can use my phone for calls and data so l can easily phone or attempt to get on KST...l will be using 10368.120...cw possible also
Kit is only around 1.75w to a flatflat panel antenna of around 20db...
Hopefully l haven't forgotten anything..
If Wednesday doesn't suit l may be able to make time on another occasion. .
Locator should be about IN88AQ but that may change if l can't get a parking space hi.
73 Alan F/GM0USI/P 07785744643




Sent from my Samsung device
-------- Original message --------
From: "Alan Dimmick dimmickalan@... [ukmicrowaves]" <ukmicrowaves@...>
Date: 18/07/2016 01:03 (GMT+01:00)
To: ukmicrowaves@...
Subject: Re: [ukmicrowaves] Re: F/GM0USI/P IN78/88 3cm next week

 

No probs Adrian,

Am.on the ferry as l write...l think tues or wed is looking possible but will post further details. .

73 Alan



Sent from my Samsung device


-------- Original message --------
From: "Adrian whatmore g4uvz@... [ukmicrowaves]"
Date: 17/07/2016 14:41 (GMT+00:00)
To: ukmicrowaves@...
Subject: [ukmicrowaves] Re: F/GM0USI/P IN78/88 3cm next week

 

I too am keen to work across from the south west from one of my sites near Taunton ..I think that you plan to work Edward VPF ..so could deploy at a similar time ..Happy for a timed sked if neccessary,,I too run the DGU but now with a 7 watt PA ,so we should have no problems
Adrian 07778 523 832   adrianwhatmore248@...


Re: F/GM0USI/P IN78/88 3cm next week

Alan
 

Hi there,

Have arrived in the Roscoff area and am staying for a week in St Pol de.Leon just to the south...wx looks extremely warm tomorrow so thinking Wednesday around 13-1500local...local time here is 1 hour ahead...
I can use my phone for calls and data so l can easily phone or attempt to get on KST...l will be using 10368.120...cw possible also
Kit is only around 1.75w to a flatflat panel antenna of around 20db...
Hopefully l haven't forgotten anything..
If Wednesday doesn't suit l may be able to make time on another occasion. .
Locator should be about IN88AQ but that may change if l can't get a parking space hi.
73 Alan F/GM0USI/P 07785744643




Sent from my Samsung device

-------- Original message --------
From: "Alan Dimmick dimmickalan@... [ukmicrowaves]"
Date: 18/07/2016 01:03 (GMT+01:00)
To: ukmicrowaves@...
Subject: Re: [ukmicrowaves] Re: F/GM0USI/P IN78/88 3cm next week

 

No probs Adrian,

Am.on the ferry as l write...l think tues or wed is looking possible but will post further details. .

73 Alan



Sent from my Samsung device


-------- Original message --------
From: "Adrian whatmore g4uvz@... [ukmicrowaves]"
Date: 17/07/2016 14:41 (GMT+00:00)
To: ukmicrowaves@...
Subject: [ukmicrowaves] Re: F/GM0USI/P IN78/88 3cm next week

 

I too am keen to work across from the south west from one of my sites near Taunton ..I think that you plan to work Edward VPF ..so could deploy at a similar time ..Happy for a timed sked if neccessary,,I too run the DGU but now with a 7 watt PA ,so we should have no problems
Adrian 07778 523 832   adrianwhatmore248@...


Re: Further Millimetric report Sunday 17th July

Roger Ray
 

John - That is a great achievement considering the high humidity.
That means there was some form of communication on Sunday, on all bands 24GHz and above.
Thats a first!!

Roger
G8CUB


Measuring Noise Figure

richard@...
 

Hi all


I watched a Youtube video recently about measuring noise figure using the measured gain of an amplifier and a spectrum analyser. The thing that I found odd was that the video maker did not terminate the input of the amplifier - he said it did not matter. I can think of two reasons why it might matter:


1) the input load resistor provides the base thermal noise level (I suppose it might not matter much if the amplifier is very noisy)

2) some amplifiers are not entirely stable when un-terminated.


Would you agree?


73 Richard G3CWI


Re: First UK QSO on the 122 GHz band

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!


Further Millimetric report Sunday 17th July

usuallyqrt@...
 

To add a bit more to Sundays Millimetric activity reports. G8KQW was able to receive my 241020 MHz auto keyer signal at 5 by 3 by  3.9Km distance LOS across Winchester.  This was one way reception. So signals a bit stronger at this shorter distance than my previous test distance of  6.75km a month ago which was marginal for signal level.

73 John G8ACE  


10GHz JT4G test Tuesday Evening

Andy G4JNT
 

Tomorrow (Tuesday 19th)   I'll be lending moral support to someone taking part in the 1.3GHz AC event.   Operating from Crabwood Farm near Winchester IO91HB65

I'll take along my 10GHz PortaBeacon and leave it running for the duration.

Crabwood Farm is one of the few sites local to me with any take off to te north, so will be pointing the 20 degree beamwidth horn that way.   In fact, trees screen the site for other directions, so NW to NE is about its only good direction for proper uWaves.

Mode JT4G only, odd and even minute transmissions carry different messages. Frequency 10368.350MHz  (Tone 0),   use SSB tuning ref 10368.3492MHz. Frequency is determined by OCXO alone, so expect a few tens of Hz uncertainty  Power around 8dBW EIRP, ie about the same as GB3SCX

If anyone wants the horn tweaked, my mobile no is 07576 765856,  and I may even have KST on hand as 3G coverage is excellent up there, being right under one of their masts.

Andy  G4JNT


Re: First UK QSO on the 122 GHz band

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


OZ5N Auto PLL

geoffrey pike
 

Back to DC matters at 10.368 GHz, i finally fitted my OZ5N auto pll and this is what happened.
Well it really didn't want to lock up at all, i changed the 82 p at the crystal to 56p. I gave everything some time to warm up and although
the blue LED flashed at 1 sec intervals it just wasn't for locking up.I adjusted the coil for a resting frequency about 200 Hz high and tried again and it locked up OK. I measured the control voltage at 1.04v and readjusted for 1.7v as i thought that this would be better and sure enough when i tried it all again the lock up was within 2 seconds.
So from a cold DB6NT it takes about 2 secs to lock but when the 10 MHz ref is removed and the xtal is up to temp it takes about 10 secs to lock.
I then put it all back together again and got my signal source fro 10.368200 GHz going and tuned in spot on 144.200 on the 290 and it just sits there rock steady T9. So that only leaves azimuth control of the dish as an unknown !.
regards
Geoff
GI0GDP
I measured the crystal frequency on the collector of the first tripler via a 22p cap


Re: First UK QSO on the 122 GHz band

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.



Re: 134 GHz frequency allocation

Roger Ray
 

Hi Bill,

The way most of us get to 134GHz. Is Elcom synthesiser on 11.2GHz, a Broadern module (X3 and Amp) giving 33.6GHz into the mixer. With the same for LO, 11.23666 x3 to 33.71 (134.84), giving 440MHz IF.
Although fine for TX the Broadern is a bit noisy as LO, so for >10km range I use a separate X3/amp in the RX LO chain.

Broadern modules are still on ebay, although the supply of 11.2-12GHz Elcom synthesisers seams to have dried up.

Roger
G8CUB


Re: Question - DBES105A Flip Chip Diodes ?

Roger Ray
 

Alan.

I did a 'last time' buy of these diodes last year of 100. However these have all now been distributed, leaving me with less than intended. So unless anyone has bought some, and are not going to use them, you will find it difficult now to find any now unfortunately.

A great pity they stopped production!

Roger
G8CUB


Re: First UK QSO on the 122 GHz band

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
mobile: +44 7545 094490
email: cbartram@theiet.org
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.


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


Question - DBES105A Flip Chip Diodes ?

Alan
 

Gidday All,
I'm wondering if there is anyone out there in Millimetre Wave land who has some of these Diodes they are willing to part with ?

We all know how the MA4E-1317 & 1318 & 1310 series of Diodes perform but I was wanting to Test these (now obsolete) Anti Parallel Diodes in a Millimetre Wave application.

Have tried all the "usual" Sources inc UMS. but no luck.

Can anyone assist me please ?
Will gladly cover all $costs for a small QTY.

Cheers,

Alan - VK3XPD

Alan Devlin.


Re: F/GM0USI/P IN78/88 3cm next week

Alan
 

No probs Adrian,

Am.on the ferry as l write...l think tues or wed is looking possible but will post further details. .

73 Alan



Sent from my Samsung device


-------- Original message --------
From: "Adrian whatmore g4uvz@... [ukmicrowaves]"
Date: 17/07/2016 14:41 (GMT+00:00)
To: ukmicrowaves@...
Subject: [ukmicrowaves] Re: F/GM0USI/P IN78/88 3cm next week

 

I too am keen to work across from the south west from one of my sites near Taunton ..I think that you plan to work Edward VPF ..so could deploy at a similar time ..Happy for a timed sked if neccessary,,I too run the DGU but now with a 7 watt PA ,so we should have no problems
Adrian 07778 523 832   adrianwhatmore248@...


Re: 134400 MHz Frequency - Its recent history as I understand it as a user

Barry Chambers
 

John

Re 241, some Elcom DFS1301 will lock up at 13.390G which also gives 241.02G

While waiting for Gordon to sort his 134G rig out, I've built a 76G rig which uses an Elcom DFS1295, so I have 75.980G for Tx and 76.410G for Rx, giving a nominal IF of 430 - 434M on the FT817.

I've also built up a programmable marker using one of the Chinese ADF4350 synth boards. For 76G, I start at 4.2209G and amplify using a Mini Circuits ZX60-33LN. This then goes into a back-to-back diode pair on the end of a piece of .141 coax. It sounds quite loud at 76.980G. The next step is to listen for it on 134G. The marker has useful frequencies programmed in for all bands from 2m up to 241G and these are chosen with a simple button press to cycle round from one to the next. The synth board is referenced to a 10MHz double oven OCXO. It also has a LCD display to show lock, synth frequency and harmonic number for the marker frequency.

73

Barry, G8AGN
On 17/07/2016 15:23, usuallyqrt@... [ukmicrowaves] wrote:

 

Back around 2000 the Wessex gang of Golfists built and had worthwhile success with 76GHz.

Following that success of course there was the next band up to be explored.  So around 2002 a start was made on 134GHz and as the technology then was to use crystals for determining the frequency a channel was chosen of 134400 and for simplicity of the overall system others would use 134545 creating a 2m 145 MHz IF for a polarplexor style of operation.  Just why 134400 was chosen I forget but with hundreds of MHz available it was highly unlikely anyone else coming later would make the same frequency choice and sure enough they didn't and as we had no worthwhile success with the 2002 constructions to publicise the original use of 134400 so it remained a secret.

Two years ago I picked up the interest in 134 again and so it was easiest to start with the previous parts both of my own and the others.  So my initial 134 equipment runs on 134400 and 134545 and is crystal controlled plus RDDS etc for stability.  With others also having built for 134 more recently it was discovered that the synths would cover 134400 (but not 134545) as well as on or near the new choice of frequencies further up the band. So the original UK working frequency chosen around 2002 became rediscovered so to speak enabling the larger group to work together. What's known as a switch together with LO on the low or alternatively high side now enables either low or high band and either 2m or 70cm IF to be used enabling better compatibility between active stations.  I hope the above gives a more complete picture of frequency developments.


As an addition to the above.  For 241GHz 241020MHz looks to be a friendly frequency between current UK users and so is likely to be one of our parking spots until there is some sufficient reason to move elsewhere. DMC bricks offer the means to get on 134400 using 13.44MHz and doubling then multiplying by five with a diode.  The IF will be none standard using the next frequency step of the synth.  Likewise a DMC brick will do 241 GHz by chosing the correct brick variant then multiplying by three with a 40G tripler amplifier and then using a x6 diode multiplier. An odd and parhaps high IF will result switching the synth one step for receive I have not explored the Rx side just limited to using the DMC for Tx purposes.  


73 John


 


134400 MHz Frequency - Its recent history as I understand it as a user

usuallyqrt@...
 

Back around 2000 the Wessex gang of Golfists built and had worthwhile success with 76GHz.

Following that success of course there was the next band up to be explored.  So around 2002 a start was made on 134GHz and as the technology then was to use crystals for determining the frequency a channel was chosen of 134400 and for simplicity of the overall system others would use 134545 creating a 2m 145 MHz IF for a polarplexor style of operation.  Just why 134400 was chosen I forget but with hundreds of MHz available it was highly unlikely anyone else coming later would make the same frequency choice and sure enough they didn't and as we had no worthwhile success with the 2002 constructions to publicise the original use of 134400 so it remained a secret.

Two years ago I picked up the interest in 134 again and so it was easiest to start with the previous parts both of my own and the others.  So my initial 134 equipment runs on 134400 and 134545 and is crystal controlled plus RDDS etc for stability.  With others also having built for 134 more recently it was discovered that the synths would cover 134400 (but not 134545) as well as on or near the new choice of frequencies further up the band. So the original UK working frequency chosen around 2002 became rediscovered so to speak enabling the larger group to work together. What's known as a switch together with LO on the low or alternatively high side now enables either low or high band and either 2m or 70cm IF to be used enabling better compatibility between active stations.  I hope the above gives a more complete picture of frequency developments.


As an addition to the above.  For 241GHz 241020MHz looks to be a friendly frequency between current UK users and so is likely to be one of our parking spots until there is some sufficient reason to move elsewhere. DMC bricks offer the means to get on 134400 using 13.44MHz and doubling then multiplying by five with a diode.  The IF will be none standard using the next frequency step of the synth.  Likewise a DMC brick will do 241 GHz by chosing the correct brick variant then multiplying by three with a 40G tripler amplifier and then using a x6 diode multiplier. An odd and parhaps high IF will result switching the synth one step for receive I have not explored the Rx side just limited to using the DMC for Tx purposes.  


73 John


 


Re: F/GM0USI/P IN78/88 3cm next week

Adrian whatmore <g4uvz@...>
 

I too am keen to work across from the south west from one of my sites near Taunton ..I think that you plan to work Edward VPF ..so could deploy at a similar time ..Happy for a timed sked if neccessary,,I too run the DGU but now with a 7 watt PA ,so we should have no problems
Adrian 07778 523 832   adrianwhatmore248@...


Re: Ofcom 5GHz Wi-Fi consultation reminder - REPLIES NEEDED!

ian hope (2E0IJH)
 

For example http://www.crestron.com/downloads/pdf/spec_sheets/commercial_and_residential/cen-wap-1500.pdf
 
Ian
2E0IJH

 
Sent: Sunday, July 17, 2016 at 1:11 PM
From: "ian ian@... [ukmicrowaves]"
To: ukmicrowaves@...
Subject: Re: [ukmicrowaves] Ofcom 5GHz Wi-Fi consultation reminder - REPLIES NEEDED!
 

 

I know nothing about 5ghz on Amateur Kit, But would just like to say. I have seen WIFI kit on Top End Home automation systems Like Crestron and Lutron, which are USA based, setup on 5ghz in this country, As I service a lot of backbone stuff, like dimmers and lights for a couple of the Home automation firms.
How widespread the use is I have no idea, but I've seen it.
 
Ian
2E0IJH
 
Sent: Sunday, July 17, 2016 at 12:35 PM
From: "mjniman@... [ukmicrowaves]"
To: ukmicrowaves@...
Subject: [ukmicrowaves] Ofcom 5GHz Wi-Fi consultation reminder - REPLIES NEEDED!
 

 

Dear all

 

The UKuG website now has a big reminder and response form for this

 

Deadline is 5pm this Friday Jul-22

 

I would encourage lots of individual replies rather than cloned copies - though you will see the RSGB draft  in a day or so  which may be a bit too detailed for some. Basically Ofcoms homework which has its flaws has almost entirely dismissed amateurs  as incumbents (a word search will find us in a few line sin teh annex)

 

Basically outdoor use affecting 5760 (and 5840 satellite) weaksignal  reception is especially unwelcome 

 

Whilst Indoor use may be less harmful - technically it will  be largely useless in any case for many consumers due to building losses - unless its an indoor crowded shopping mall , stadium etc etc

 

The other thing is, as written, it (and the RED) will cripple any future use for Amateur radio mesh/data  as well

(given we are heavily restricted in our UK 5GHz allocations compared to others)

 

 

 Murray

 
PS This is not just a UK issue   - it will affect all CEPT/Region-1 countries too as its a WRC agenda item too.
(whereas in the USA the band is already WiFi with 4-6W permitted -so it could be a lot more erp than 2.4) 
 
PPS Amsat-UK have a nice item here as well