Date   

Re: Es'hail

Glyn M0XGT
 

One option that saves a lot of hassle (but costs more than hacking an LNB) is to use a Kuhne MKU LNC QO-100 block down-converter, 10 GHz -> 433-435 MHz, 10 MHz ext ref in, NF 1.7dB, along with the matching KU BT 10REF bias-tee.

This gives you an easy remote power-over-coax solution and an LO precisely locked to your 10 MHz lab reference. 
 
Glyn M0XGT


Es'hail

Tony Pugh GW8ASD
 

Hi everyone!

I’m looking for recommendations for what’s currently the best choice of LNB.

Initially RX only, it’s up and running but chasing signals around isn’t fun  J , hopefully TX in a while.

 

Cheers

 

Tony

 


Test

Tony Pugh GW8ASD
 

First input test.


Re: 23cm quadrature hybrid for circular polarisation

John E. Beech
 

Paper 35 is Pages 216 to 221 of the pdf file - should make it a bit easier to find.

de John G8SEQ

-------Original Message-------
From: Alan Beard <beardal@unixservice.com.au>
To: UKMicrowaves@groups.io <UKMicrowaves@groups.io>
Subject: [UKMicrowaves] 23cm quadrature hybrid for circular polarisation
Sent: Jun 08 '20 07:08

Hi guys,

Has anybody built a hybrid coupler such as this in paper 35
of this compilation?

https://espace.library.uq.edu.au/view/UQ:307019/Abbosh_DEng_2013_F.pdf?
dsi_version=2a799c6f85b860cd6dacb73529bb448c


The circular "slot" and tracks either side of a groundplane
do not look to hard to make at 1/4 wave size for 23cm.

I also found another "mountain" shape design, even better.
https://core.ac.uk/download/pdf/30312032.pdf


---------------------------------------------------
Alan VK2ZIW

OpenWebMail 2.53





23cm quadrature hybrid for circular polarisation

Alan Beard
 

Hi guys,

Has anybody built a hybrid coupler such as this in paper 35
of this compilation?

https://espace.library.uq.edu.au/view/UQ:307019/Abbosh_DEng_2013_F.pdf?
dsi_version=2a799c6f85b860cd6dacb73529bb448c


The circular "slot" and tracks either side of a groundplane
do not look to hard to make at 1/4 wave size for 23cm.

I also found another "mountain" shape design, even better.
https://core.ac.uk/download/pdf/30312032.pdf


---------------------------------------------------
Alan VK2ZIW

OpenWebMail 2.53


Re: 70 cms tests

Derek Brown G8ECI
 

Hi John,

Left the 2nd RX of the new toy IC-9700 on 432.200, whilst monitoring GB3MCB on 144 Mhz for AS while I had Air Scout setup on your Loc, got quite a few AS reflections from MCB, but nowt seen or heard on .200, I also tried with Dick down in Bath on FT8 on AS, as I saw suitable aircraft in the region where he should have got something, but he also saw nothing on his system, although his antenna is probably worse than yours its an Hentenna attached to the inside of a window which faces North, but he gets regular decodes from GB3UHF and also some from NGI. I have found band condx plummet during the last few days, I cannot hear UHF at the present, whereas it was there on Thursday when I had the TS2000X on the bench, as that was turned into a IC-9700 by the act of the folding stuff and trading various Radios that I had collected over the years, I cannot believe that the 9700 is a worse receiver than the 2000X, I can still here PI7CIS on 70cm and other PI beacons on 2M, cannot normally hear any beacons on 23cm, but I think QHN in PA land comes up when ever there's a bit of an inversion over the North Sea, with the current weather thats not going to occur any day soon.

But did have some success, although on a even lower band than 144Mhz, worked WP4 on 6M, ! so not a total waste of an afternoon....

73 Derek G8ECI


On Sunday, 7 June 2020, 15:38:07 BST, John E. Beech <john@...> wrote:


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@...>
>  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: 10Ghz test

Adrian G4UVZ
 

Listen out for GB3KBQ 10368.870     when there is rain about!


70 cms tests - suspended

John E. Beech
 

Hi All,
I've suspended any further tests until I've got my antenna sorted. The corrosion is worse than I thought, so it will have to be a complete strip down & re-build. I also suspect water may have gotten in to the foam dielectric of the phasing harness so that may have to be replaced. I did put some CQ's out but the ALC was limiting o/p pwr to 5 W because of the high VSWR. Thanks to anyone that listened.

de John G8SEQ

-------Original Message-------
From: John E. Beech <john@g8seq.com>
To: UKMicrowaves@groups.io <UKMicrowaves@groups.io>
Subject: Re: [UKMicrowaves] 70 cms tests
Sent: Jun 07 '20 15:38

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

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

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