Date   

Re: 70 cms tests

John E. Beech
 

Hi Derek,
I've just done some VSWR measurements which weren't very promising. I'm going to clean up the connections and have another go. I've only got 20 W at the Tx & the antenna has 11 dBi gain so won't be a mega signal. However, should be able to work Bath I would have thought. The antenna has some higher lobes which are elliptically polarised so might be able to work you via AS ( Fat chance!), but you never know your luck & you won't work anything unless you try.
I should be ready to Tx again by about 16:00 BST.

de John G8SEQ

-------Original Message-------
From: Derek Brown G8ECI via groups.io <g8eci=yahoo.co.uk@groups.io>
To: UKMicrowaves@groups.io <UKMicrowaves@groups.io>
Subject: Re: [UKMicrowaves] 70 cms tests
Sent: Jun 07 '20 14:47

Hi John

Large lump of Lincolnshire in the way, but will put beam in your
direction and have a listen. Derek in Jo03ai, a friend Dick G8ELW is
only QRV on 70cm with a very simple setup, he's in Bath, will tell him
to listen as well

73 Derek G8ECI

On Sunday, 7 June 2020, 13:52:16 BST, John E. Beech <john@g8seq.com>
wrote:

Hi All,
Not strictly microwave but:- will there be any activity on 70 cms
today?. I've resurrected my 432 MHz horizontally polarized omni &
would like to try it out. So if any body is available for some tests,
point your beam at Coventry & you should hear me calling CQ on 432.200
USB from time to time during the afternoon/evening.

de John G8SEQ
PS. Still no go on 23 cms having mechanical problems with new dish
feed.


Re: 70 cms tests

Derek Brown G8ECI
 

Hi John

Large lump of Lincolnshire in the way, but will put beam in your direction and have a listen. Derek in Jo03ai, a friend Dick G8ELW is only QRV on 70cm with a very simple setup, he's in Bath, will tell him to listen as well

73 Derek G8ECI

On Sunday, 7 June 2020, 13:52:16 BST, John E. Beech <john@...> wrote:


Hi All,
        Not strictly microwave but:-  will there be any activity on 70 cms today?. I've resurrected my 432 MHz horizontally polarized omni & would like to try it out. So if any body is available for some tests, point your beam at Coventry & you should hear me calling CQ on 432.200 USB from time to time during the afternoon/evening.

de John G8SEQ
PS. Still no go on 23 cms having mechanical problems with new dish feed.




70 cms tests

John E. Beech
 

Hi All,
Not strictly microwave but:- will there be any activity on 70 cms today?. I've resurrected my 432 MHz horizontally polarized omni & would like to try it out. So if any body is available for some tests, point your beam at Coventry & you should hear me calling CQ on 432.200 USB from time to time during the afternoon/evening.

de John G8SEQ
PS. Still no go on 23 cms having mechanical problems with new dish feed.


Re: dish feed advice for 13cm terrestrial advice

Mike Willis
 

 Expect about 25 dBi from the dish if fed with a small yagi feed. You might be better off with a Yagi array then a small dish on 2.4 GHz given the wind loading. The gain will be about the same with a box of 4 long (1.5m) yagis. However a dish is multi-band. RFHamDesign do multi-band and single band feeds for their mesh dishes but low F/D. 
--
Mike G0MJW


dish feed advice for 13cm terrestrial advice

G0FVI
 

 

So the uwave bug has truly bitten here and now thinking of terrestrial  operation of 13cm. I have an 85cm offset dish which will go on top of mast of 10m mast, to begin with just SGlabsTVTR mounted there (later on chipbank LDMOS amp hopefully). Just wondered what dish feeds people are using, looking at knocking up a patch feed (K3TZ without CPR) here but wondered if another approach might be better?

 

Andy G0FVI

 


Re: Activity List for the UK Microwave Group Low Band Contest Sunday 7th June

Bob_G1ZJP
 

Sorry all – Locator IO92wv21

 

Other details correct 😊

 

73

Bob, G1ZJP  / M1MHZ

 

 

 

From: Robert Offer
Sent: 07 June 2020 11:03
To: UKMicrowaves@groups.io
Subject: RE: [UKMicrowaves] Activity List for the UK Microwave Group Low Band Contest Sunday 7th June

 

Callsign: M1MHZ
Locator : IO93wv21
Band: 2320MHz 2W 67 element
Talkback: KST will be on when I am in the shack or mobile alert 07825 334407
Times: Various

 

 

 

From: Peter GW4JQP
Sent: 07 June 2020 10:54
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] Activity List for the UK Microwave Group Low Band Contest Sunday 7th June

 

Good morning

As a late addition, I hope to be able to add a 23cm signal at some point.

Callsign: GW4JQP
Locator : IO71KR
Band: 1296MHz 20W 35 element
Talkback: KST will be on when I am in the shack
Times: Various

73

Peter GW4JQP

 

 


Re: Activity List for the UK Microwave Group Low Band Contest Sunday 7th June

Tim Fern
 

I'm also QRV now for the duration..

Callsign : G4LOH
Locator: IO70JC09LW
Bands: 1296MHz 75W 4 x 44ele Ele
Talkback: via ON4KST


Re: Activity List for the UK Microwave Group Low Band Contest Sunday 7th June

Bob_G1ZJP
 

Callsign: M1MHZ
Locator : IO93wv21
Band: 2320MHz 2W 67 element
Talkback: KST will be on when I am in the shack or mobile alert 07825 334407
Times: Various

 

 

 

From: Peter GW4JQP
Sent: 07 June 2020 10:54
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] Activity List for the UK Microwave Group Low Band Contest Sunday 7th June

 

Good morning

As a late addition, I hope to be able to add a 23cm signal at some point.

Callsign: GW4JQP
Locator : IO71KR
Band: 1296MHz 20W 35 element
Talkback: KST will be on when I am in the shack
Times: Various

73

Peter GW4JQP

 


Re: Activity List for the UK Microwave Group Low Band Contest Sunday 7th June

Peter GW4JQP
 

Good morning

As a late addition, I hope to be able to add a 23cm signal at some point.

Callsign: GW4JQP
Locator : IO71KR
Band: 1296MHz 20W 35 element
Talkback: KST will be on when I am in the shack
Times: Various

73

Peter GW4JQP


Re: I want to document some RF techniques, help please

Alan Beard
 

Robin,
Can you look at my document:

and tell me where in Chapter 7 all six types are covered?

AND, tell me if there are any missing, that I need to include?

Alan VK2ZIW


On Fri, 5 Jun 2020 02:03:46 +0100, Robin Szemeti - G1YFG wrote
> Coupling loops are covered in Chapter 7 of the online book I linked you to.
>
> On Fri, 5 Jun 2020 at 00:53, Alan Beard <beardal@...> wrote:
>

> Actually Robin,
>
>

> The cavities are not the problem. For my four RFS (Radio Frequency Systems or AEA) cavities, 
> I tapped the end of the plunger, three holes, made a 100mm x 80mm cylinder and attached it
> onto the plunger - done.
>
>

> Back to the problem: Where do I find an article that has diagrams or pictures of ALL
> coupling loop types or even capacitive coupling?
>
>

> WE HAVE TO WRITE IT or there isn't one.
>
>

> Alan VK2ZIW
>
>

> On Fri, 5 Jun 2020 00:05:31 +0100, Robin Szemeti - G1YFG wrote
> > What split are you trying to achieve with 4 cavities?   Also, getting a 75MHz cavity down to 6m (50MHz) is going to be a big challenge, I don't think they will tune that far. You may have to build a new set from scratch ... alloy outer tubes, copper resonator and a invar steel compensator are the way to go ...  unless they are helical filters, you want something a little over 1/4 wave long  that's going to be a fairly big cavity!
> >
> > Generally for the amateur splits (0.6m on 144, 1.6 on 432) you need 6 cavities ... you cannot get decent performance with 4 for the typical splits we use. 4 would probably manage a 600kc split on  50mhz .. depending on the quality of the cavities.  
> >
> > I'd go for 6 cavities .. the first as a bandpass ... 3 per side ... first one tuned as a bandpass, no top cap/inductor ... and then 2 notches.   Put a 2 port isolator between the TX and the first cavity,
> >
> > On Thu, 4 Jun 2020 at 23:23, Alan Beard <beardal@...> wrote:
> >

> > Thanks Robin,
> >
> >

> > The w6nbc-duplexer-book/ch3 to 9.html pages are good general information 
> > and the tuning YouTube video is good for tuning.
> >
> > However, when your small club wants a 6m repeater and you are presented
> > with four 75MHz six inch cavities with one side entry port on each, how do you proceed?
> >
> > First, you'd like to find ALL coupling techniques possible.
> > John W6NBC does not mention in two port cavities, capacitive coupling at the hot end.
> > In his BpBr diagrams, an L or C between the ports is mentioned to swap
> > the pass and notch. What about swapping the phase of one of the loops?
> >
> > How about the RxTx Vari-Notch, a parallel L and C between two connectors?
> >
> > I've provided a document in "Files" exploring as many as I know of the techniques,
> > I want any incite here please?
> > And here, a PICTURE speaks a THOUSAND words.
> > (or a detailed diagram)
> >
> > Alan VK2ZIW
> >  
> >
> >

> > On Mon, 1 Jun 2020 10:16:33 +0100, Robin Szemeti - G1YFG wrote
> > > Try this: http://www.repeater-builder.com/antenna/w6nbc-duplexer-book/ch3.html
> > >
> > > And a couple of good YouTube videos on the subject:
> > >
> > > https://www.youtube.com/watch?v=NKw6-x4gFJI
> > >
> > > https://www.youtube.com/watch?v=2Y1aMhCcxXY
> > >
> > > The problem may be that you are trying to achieve a narrower spacing than the notch is set up for, if you are trying to achieve a 1.6 MHz spacing from a setup deigned for a 5MHz spacing there may not be enough range on the trimmers to move the notch where you want it to be.   You will struggle to achieve 1.6MHz spacing on 2 cavities a side .. 3 is the minimum and 4 is better.
> > >
> >
> > ---------------------------------------------------
> > Alan Beard
> >
> > OpenWebMail 2.53
> >
> >
> >
> >


> > --
> >
> >
Best 
regards,


> >
> > Robin Szemeti
> >
> > Redpoint Consulting Limited
> >
> > E: robin@...
> > T: +44 (0) 1299 405028
> > M: +44 (0) 7971 883371
> >
> > CONFIDENTIALITY NOTICE
> > The information contained in this e-mail is intended only for the
> > confidential use of the above named recipient. If you are not the
> > intended recipient or person responsible for delivering it to the
> > intended recipient, you have received this communication in error
> > and must not distribute or copy it.
> > Please accept the sender's apologies, notify the sender immediately
> > by return e-mail and delete this communication.
> >
> > Thank you.

>
> ---------------------------------------------------
> Alan Beard
>
> OpenWebMail 2.53
>
>
>
>


> --
>
>
Best regards,

>
> Robin Szemeti
>
> Redpoint Consulting Limited
>
> E: robin@...
> T: +44 (0) 1299 405028
> M: +44 (0) 7971 883371
>
> CONFIDENTIALITY NOTICE
> The information contained in this e-mail is intended only for the
> confidential use of the above named recipient. If you are not the
> intended recipient or person responsible for delivering it to the
> intended recipient, you have received this communication in error
> and must not distribute or copy it.
> Please accept the sender's apologies, notify the sender immediately
> by return e-mail and delete this communication.
>
> Thank you.


---------------------------------------------------
Alan Beard

OpenWebMail 2.53


Re: Ofcom EM Fields

Paul Randall G3NJV
 

Hi Graham, many thanks for the link and bringing this to my attention. I just read through the document and understand why you are so impressed. I am too. It is a superbly written response, the content is knowledgeable and informed and the document presentation is immaculate (I didn’t see any errors).

 

Absolutely full marks and my admiration to the authors, what a fine job!

 

This year I clocked up my 50 year membership of RSGB, got the badge to show for it!

I’m proud to have supported an organisation over my lifetime that can rise to the occasion and write such a professional response. Yes, worth every penny.

 

Every UK radio amateur should read that document and either feel proud to be an RSGB member, or seriously question why they are not.

 

There are many similar examples of how our highly professional members have worked with RSGB to support amateur radio; Peter Chadwick recounted his fascinating experiences here just recently.

 

No matter what your politics, supporting your national society so that it can work in this way for the benefit of all licensees is really a no-brainer.

Shame on those that free-ride, get on board and join those that have enabled this to happen.

 

A huge thank you to the many people that will have worked hard to create that document. Yes, I’m really proud of you.

Brilliant.

Paul G3NJV

 

 

 

Sent from Mail for Windows 10

 

From: Graham G3TCT
Sent: 06 June 2020 21:12
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] Ofcom EM Fields

 

I guess most of you have seen the RSGB response to this
http://rsgb.org/main/files/2020/06/200605_Ofcom-EMF-Consultation_RSGB-Response.pdf


It's the most comprehensive taking apart of an Ofcom document I've yet
to see. I'm very impressed and I can't see there's anything useful I
could add except "hear hear".  But I'm working on it!

73
Graham

 


Re: Ofcom EM Fields

Graham G3TCT
 

I guess most of you have seen the RSGB response to this
http://rsgb.org/main/files/2020/06/200605_Ofcom-EMF-Consultation_RSGB-Response.pdf


It's the most comprehensive taking apart of an Ofcom document I've yet to see. I'm very impressed and I can't see there's anything useful I could add except "hear hear". But I'm working on it!

73
Graham


Re: Beacon Spotting Expedition: Walton Hill

Stuart G1ZAR
 

Hello Iain,
Not sure of work commitments just yet, but I could probably make it to my local SOTA summit of G/CE004 with 23cm equipment.
I would think it would be an easy S2S
Would like to try contact with you on some of the other summits once you have worked out your plans.

73
Stuart
G1ZAR


Beacon Spotting Expedition: Walton Hill

Iain Young
 

Hi Folks,

Just a quick heads up to say that next Saturday (13th) June, I am
planning on climbing Walton Hill (SOTA summit G/CE-002) for a spot(!)
of beacon spotting on L/S/F/C band with my (two legged) portable uWave
SDR receiver [Raspberry Pi 4, with 10 inch touchscreen running gnuradio
if anyone is interested!]

As it is also a SOTA summit, I am intending to attempt to activate it
on 23cms FM, so contacts would be appreciated. I'm planning on doing
the beacon spotting first, so expect to be on 23cms FM no earlier than
1130-1200Z (1230-1300 Local)

I will self spot on the SOTA spotting site, but am unlikely to have
email access to notify here.

Further SOTA summits and/or high points that I am planning to do over
the next few months via train include:

Bredon Hill (G/CE-003), Caer Caradoc (G/WB-006), Long Mynd (G/WB-005),
The Wretkin (G/WB-010), Callow Hill (G/WB-015), and View Edge (G/WB-018),
so expect a few more shouts for QSO's on 23cms!

Over the same timeframe, I am also intending to develop the portable
uWave receiver to include 24GHz, and (initially) a beacon facility, to
be followed by a QSO capability, so some of the above listed sites may
allow QSO


73s

Iain


Re: Ofcom EM Fields

Dave G8KHU
 

Not a comment on the Ofcom consultation but for those who like to put numbers and formulas to practical applications https://www.etsi.org/deliver/etsi_tr/102400_102499/102457/02.01.00_60/tr_102457v020100p.pdf is a useful document.


10Ghz test

militaryoperator
 

Just tried my Kuhne 3Cm and its small feed horn on its own, 40ft up and receiving the Leicester beacon about 53/54, odd though, checking QRZ to get a distance the quoted figure and direction seems different to where I put it. 

G3VKV also sent me a signal at a nice 58 so things bode well.

Anyway, next step is to add my relay and bits and I'll see where the tx can get to.

Should have a bigger horn soon so should prove interesting to try.

Ben G4BXD


Ofcom EM Fields

Julian, G3YGF
 

This affects all of us, as Ofcom is proposing to change the licence conditions relating to EM Fields.

RSGB has published its response to the Ofcom EM Fields consultation, and there is a template for individual responses...

It would be good to have as many individual inputs as possible...
Could people have a look at the template and send one in for themselves?

https://rsgb.org/main/technical/emc/emf-exposure/

Responses have to be in by next friday, 12th June, so do it early this week to be sure of the deadline.

Julian, G3YGF


Ofcom EM Fields

Julian, G3YGF
 

This affects all of us, as Ofcom is proposing to change the licence conditions relating to EM Fields.

RSGB has published its response to the Ofcom EM Fields consultation, and there is a template for individual responses...

It would be good to have as many individual inputs as possible...
Could people have a look at the template and send one in for themselves?

https://rsgb.org/main/technical/emc/emf-exposure/

Responses have to be in by next friday, 12th June, so do it early this week to be sure of the deadline.

J


Re: [UKuG-Committee] UKMicrowave group Subscription - Cheque payments

Neil Smith G4DBN
 

I use banking and payment and purchase-enabled apps on my phone without any qualms, but then I never install games or anything other than well-verified apps, and don't visit dodgy sites on the phone. 

However, what do I know? I'm so trusting that I even use a fingerprint authorisation on my banking app.  All someone needs is my phone and finger, and they can go wild with the £137.90 in my pocket-money account. It's all about what your risk appetite is, the threat landscape, who the threat actors are and what attack vectors are available to them.

Neil G4DBN

(Cybersecurity CTO, keeping government systems, billion-pound payment services and multinational corporate client systems safe so I can use my wages to "invest" in radio/machining stuff, dog treats and other money-pits)

On 06/06/2020 13:37, Andy G4JNT wrote:
Having your mobile phone stolen with the banking app on it is no worse than having a credit card stolen (with the three-digit printed number on the back now known to them).  
I haven't studied the Lloyds banking app in much detail as I have no need to use it, just downloaded it when the bank said it was available. For payments a contactless card is quicker than getting the phone out and entering the PIN.
I don't even use the fingerprint ID option on the iPhone, a 6 digit PIN is scure enough, when it is permanently locked after ten incorrect attempts.

PINs, even short ones, are a surprisingly good security feature so long as delays are increased after a 'few' wrong attempts.   And, of course, the algorithms used to hold them use proper cryptographic techniques.
 


On Sat, 6 Jun 2020 at 12:39, John Worsnop <johnworsnop@...> wrote:
Thanks for the feedback folks. Many  have suggested I get up to date and use the cheque scanning App that Lloyds provide with their phone banking App  ;-) so I have downloaded it to my personal phone now and used it with a cheque I just got. Seemed to work once I got used to it. So I propose to use it on a trial basis for a while. 

I should point out, for avoidance of doubt, that, while my phone is password and face-recognition protected, nor are the login details stored on my phone, if my phone gets stolen and UKuG bank details are used to steal your money I will NOT be held personally responsible for refunding it.

I personally do not use mobile banking apps for this very reason due to the physical vulnerability of a handheld device.

If members, or your Committee are unhappy with this I would suggest we either return to the status quo, or use club funds to buy a Smartphone and a PAYG contract purely for this application, as I will not be held liable in any way for the loss of Club funds accessed from data on my personal stolen phone.

73

John       
 

On Sat, 6 Jun 2020 at 08:18, Martyn G3UKV <ukv@...> wrote:
Hi John
I support the BATC view (below), echoed by quite a few others posted to date. [be inclusive]
73 Martyn G3UKV


On 05/06/2020 14:16, Noel G8GTZ wrote:

FYI – BATC went through this a couple of years ago when we installed our new web shop and membership system.

 

Personally I was against keeping the cheque facility but was persuaded otherwise on the basis that it excludes a small but important group of people and it is important to make the hobby as inclusive as possible.

 

As a result BATC does still take cheques and as a result of COVID we found that you can post cheques to your branch along with a paying in slip – an easy and not time consuming process which we consider worthwhile for a few members who feel more comfortable doing this rather than on-line transactions.

 

Noel

 

From: UKuG-Committee@groups.io [mailto:UKuG-Committee@groups.io] On Behalf Of John Worsnop
Sent: 05 June 2020 11:52
To: UKMicrowaves@groups.io; UKuG-Committee@groups.io
Subject: [UKuG-Committee] UKMicrowave group Subscription - Cheque payments

 

Due to the current situation I am unable to get to the bank to pay in cheques. So if you've sent me one recently, don't expect it to clear in the foreseeable future.

 

I will of course advise the membership secretary that the sub  has been paid if you do. 

 

You could really help by not paying your £6 (!!) by cheque,  and using our Paypal facility  (ukug@...) or contact me off reflector for UKuG bank details and doing a direct transfer (UK members only)

 

On reflection I'm of the view it's time, in the 21st Century, to stop accepting cheque payments altogether.

 

I plan to raise this with the committee in due course.

 

This currently is only my personal view as treasurer as I have to get in to my car, drive 5 miles in to Cambridge, park up, and walk for 20 minutes (from the only remaining free parking close to Cambridge Centre) to take them to the bank.

 

I'd appreciate member's feedback on this proposal

 

73

John G4BAO

UKuG Treasurer

 

  



Virus-free. www.avg.com
-- 
Neil
http://g4dbn.uk


Re: [UKuG-Committee] UKMicrowave group Subscription - Cheque payments

Adrian G4UVZ
 

HBOS, Lloyds..and maybe others now support depositing of cheques by using their Ap  just take a picture of the front and rear of the cheque enter the amount and the job is done!

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