Date   

Re: Activity List for the UK Microwave Group Low Band Contest - Sunday 15th November

Pete - GM4BYF
 

Callsign: GM4BYF
Locator: IO85JV
Bands: 1296MHz 100W 55 el
            2320MHz 100W 1.2m dish OR if string winds 67 ele Wimo

Talkback: ON4KST and direct CQ on 1.3GHz
Times: throughout

73
Pete GM4BYF

On 08/11/20 15:37, John Quarmby via groups.io wrote:
Callsign: G3XDY
Locator: JO02OB
Bands: 1296MHz 400W 4x23 el
             2300/2320MHz 200W 0.8m dish
             3400MHz 20W 0.8m dish
Talkback: ON4KST and direct CQ on 1.3GHz
Times: Various throughout
--
vry 73
Pete GM4BYF


3400MHz

DF6NA Rainer
 

Hi All,

I will sell all my 9cm equipment. There is a DB6NT transverter (& PLL
Oszillator with 10MHz input) with Toshiba driver and DL2AM PA (130 W !).
The 130W PA and preamp are mast mounted and fed with ~15m ECOFLEX15.

If you are interested please let me know direct. Pictures on request.

vy 73, Rainer
df6na@df6na.de


Re: Tap-breakers and Swearers Club

Ian White
 

Thanks to everyone who replied.

I've learned a lot (including answers to questions I hadn't even thought of asking) and can now see how to do it.

73 from Ian GM3SEK


On 10/11/2020 10:22, Ian White wrote:

One of the next jobs here will be to drill a precise pattern of holes in the heatsink of an existing SSPA, and tap them for M2.5 screws.



Re: Activity List for the UK Microwave Group Low Band Contest - Sunday 15th November

Phil Guttridge G3TCU
 

I plan to be giving some points away at home:

Callsign: G3TCU
Locator: IO91QE
Bands: 1296MHz 250W 44 el
Talkback: ON4KST and direct CQ on 1.3GHz
Times: Various throughout.

On KST when QRV.




On 08/11/2020 15:37, John Quarmby via groups.io wrote:
The final UKuG contest of 2020 will take place next Sunday 15th November from 1000 - 1400gmt, on the 1296,2300,2320, and 3400MHz bands.

Full rules are here:
https://microwave.rsgbcc.org/cgi-bin/contest_rules.pl?year=2020&contest=lb_contest

Portable entries from England will not be accepted for this event. Please obey local Covid-19 restrictions in force at the time of the event throughout the UK and Crown Dependencies.

I will compile an activity list for circulation next Saturday. Please use the usual format:

Callsign: G3XDY
Locator: JO02OB
Bands: 1296MHz 400W 4x23 el
             2300/2320MHz 200W 0.8m dish
             3400MHz 20W 0.8m dish
Talkback: ON4KST and direct CQ on 1.3GHz
Times: Various throughout

73

John G3XDY



Virus-free. www.avast.com


Re: SG-Labs,

Nigel G8IFN
 

I ordered a 9cm transverter today.
Hristiyan responded to my enquiry within 40min
I'm located in Essex looks like there is a few active in the vicinity so maybe a good chance of a QSO in 3-4 weeks time.
--
Nigel G8IFN


Re: 47 GHz

Roger Ray
 

Mark, I think it is x4 only. But it is possible to hit it harder at 11..G . I think 50mW may be possible.
Roger


On 13 Nov 2020, at 12:26, Mark GM4ISM via groups.io <gm4ism@...> wrote:



Hi Roger

Have you tried hitting the Pasolink multiplier  with 23.5GHz,  x2?

 I'm hoping for maybe a little more than the 15mW for the CSB Beacon.  I have some 100mW 23GHz Power amps from old Siae links, they don't go up to 24 but work fine at 23.5

On 13/11/2020 10:09, Roger Ray via groups.io wrote:
Sorry forgot to mention high pass filters. I don’t think you will find anything in wr-28.
I did find some wr-28 style flange, but wr-22 band pass filters centred on 50GHz a while ago. But not any lately. 1296 is good idea for IF though, it would make a home constructed filter easier.
Roger


On 13 Nov 2020, at 09:12, John Lambo <pa7jb@...> wrote:





Hi Roger,
Do you have a photo off this switch?
And i wonder if any one made a highpass filter in WR28 waveguide for 47ghz?
I want to use 1296mhz as IF
Thank you for reply...

73  John  PA7JB




Op 12-11-2020 om 20:05 schreef Roger Ray via groups.io:
Hi Barry, I need to draw it really. However if you look down on the switch, with the antenna port at 12.00. The mixer rf port is on the 3.00 wg switch port. The wg 6.00 port connects to waveguide going round to the mixer LO port. The Multiplier connects to the switch 9.00 port.
Tx . the LO links to Ant port.
RX . Ant connects to mixer RF, plus the Multiplier connects via waveguide to mixer LO port.

I hope that makes sense

Roger
G8CUB


On 12 Nov 2020, at 18:31, Barry VE4MA <ve4ma@...> wrote:


GE Roger,

I don't understand how you are configuring  the WG switch to do that?  I assume it is a standard 4 port switch without the thru position? Can you explain a little more?
Thanks

Best 73
Barry VE4MA



Virus-free. www.avg.com


Re: 47 GHz

John Lambo
 

Hi Roger,
Thank you for the link.
I  understand that i will not find this filter.
But i want to make one.
But how to calculate this that is not so easy i think?
Any help will be welcome..

73  John  PA7JB




Op 13-11-2020 om 11:09 schreef Roger Ray via groups.io:

Sorry forgot to mention high pass filters. I don’t think you will find anything in wr-28.
I did find some wr-28 style flange, but wr-22 band pass filters centred on 50GHz a while ago. But not any lately. 1296 is good idea for IF though, it would make a home constructed filter easier.
Roger


On 13 Nov 2020, at 09:12, John Lambo <pa7jb@...> wrote:





Hi Roger,
Do you have a photo off this switch?
And i wonder if any one made a highpass filter in WR28 waveguide for 47ghz?
I want to use 1296mhz as IF
Thank you for reply...

73  John  PA7JB




Op 12-11-2020 om 20:05 schreef Roger Ray via groups.io:
Hi Barry, I need to draw it really. However if you look down on the switch, with the antenna port at 12.00. The mixer rf port is on the 3.00 wg switch port. The wg 6.00 port connects to waveguide going round to the mixer LO port. The Multiplier connects to the switch 9.00 port.
Tx . the LO links to Ant port.
RX . Ant connects to mixer RF, plus the Multiplier connects via waveguide to mixer LO port.

I hope that makes sense

Roger
G8CUB


On 12 Nov 2020, at 18:31, Barry VE4MA <ve4ma@...> wrote:


GE Roger,

I don't understand how you are configuring  the WG switch to do that?  I assume it is a standard 4 port switch without the thru position? Can you explain a little more?
Thanks

Best 73
Barry VE4MA




Re: 47 GHz

Mark GM4ISM
 

Hi Roger

Have you tried hitting the Pasolink multiplier  with 23.5GHz,  x2?

 I'm hoping for maybe a little more than the 15mW for the CSB Beacon.  I have some 100mW 23GHz Power amps from old Siae links, they don't go up to 24 but work fine at 23.5

On 13/11/2020 10:09, Roger Ray via groups.io wrote:
Sorry forgot to mention high pass filters. I don’t think you will find anything in wr-28.
I did find some wr-28 style flange, but wr-22 band pass filters centred on 50GHz a while ago. But not any lately. 1296 is good idea for IF though, it would make a home constructed filter easier.
Roger


On 13 Nov 2020, at 09:12, John Lambo <pa7jb@...> wrote:





Hi Roger,
Do you have a photo off this switch?
And i wonder if any one made a highpass filter in WR28 waveguide for 47ghz?
I want to use 1296mhz as IF
Thank you for reply...

73  John  PA7JB




Op 12-11-2020 om 20:05 schreef Roger Ray via groups.io:
Hi Barry, I need to draw it really. However if you look down on the switch, with the antenna port at 12.00. The mixer rf port is on the 3.00 wg switch port. The wg 6.00 port connects to waveguide going round to the mixer LO port. The Multiplier connects to the switch 9.00 port.
Tx . the LO links to Ant port.
RX . Ant connects to mixer RF, plus the Multiplier connects via waveguide to mixer LO port.

I hope that makes sense

Roger
G8CUB


On 12 Nov 2020, at 18:31, Barry VE4MA <ve4ma@...> wrote:


GE Roger,

I don't understand how you are configuring  the WG switch to do that?  I assume it is a standard 4 port switch without the thru position? Can you explain a little more?
Thanks

Best 73
Barry VE4MA



Virus-free. www.avg.com


Re: 47 GHz

Roger Ray
 

Sorry forgot to mention high pass filters. I don’t think you will find anything in wr-28.
I did find some wr-28 style flange, but wr-22 band pass filters centred on 50GHz a while ago. But not any lately. 1296 is good idea for IF though, it would make a home constructed filter easier.
Roger


On 13 Nov 2020, at 09:12, John Lambo <pa7jb@...> wrote:





Hi Roger,
Do you have a photo off this switch?
And i wonder if any one made a highpass filter in WR28 waveguide for 47ghz?
I want to use 1296mhz as IF
Thank you for reply...

73  John  PA7JB




Op 12-11-2020 om 20:05 schreef Roger Ray via groups.io:
Hi Barry, I need to draw it really. However if you look down on the switch, with the antenna port at 12.00. The mixer rf port is on the 3.00 wg switch port. The wg 6.00 port connects to waveguide going round to the mixer LO port. The Multiplier connects to the switch 9.00 port.
Tx . the LO links to Ant port.
RX . Ant connects to mixer RF, plus the Multiplier connects via waveguide to mixer LO port.

I hope that makes sense

Roger
G8CUB


On 12 Nov 2020, at 18:31, Barry VE4MA <ve4ma@...> wrote:


GE Roger,

I don't understand how you are configuring  the WG switch to do that?  I assume it is a standard 4 port switch without the thru position? Can you explain a little more?
Thanks

Best 73
Barry VE4MA



Re: 47 GHz

Roger Ray
 

Hi John,

The waveguide switch can clearly be seen, in my article. ‘simple 47GHz transverter’.

It is on my website.  www.rfdesign.co.uk/microwave

I see wr-28 mixer on epay for $61. Looks like it has a pre-amp, but that can be linked out.

Roger


On 13 Nov 2020, at 09:12, John Lambo <pa7jb@...> wrote:





Hi Roger,
Do you have a photo off this switch?
And i wonder if any one made a highpass filter in WR28 waveguide for 47ghz?
I want to use 1296mhz as IF
Thank you for reply...

73  John  PA7JB




Op 12-11-2020 om 20:05 schreef Roger Ray via groups.io:
Hi Barry, I need to draw it really. However if you look down on the switch, with the antenna port at 12.00. The mixer rf port is on the 3.00 wg switch port. The wg 6.00 port connects to waveguide going round to the mixer LO port. The Multiplier connects to the switch 9.00 port.
Tx . the LO links to Ant port.
RX . Ant connects to mixer RF, plus the Multiplier connects via waveguide to mixer LO port.

I hope that makes sense

Roger
G8CUB


On 12 Nov 2020, at 18:31, Barry VE4MA <ve4ma@...> wrote:


GE Roger,

I don't understand how you are configuring  the WG switch to do that?  I assume it is a standard 4 port switch without the thru position? Can you explain a little more?
Thanks

Best 73
Barry VE4MA



Re: 47 GHz

John Lambo
 




Hi Roger,
Do you have a photo off this switch?
And i wonder if any one made a highpass filter in WR28 waveguide for 47ghz?
I want to use 1296mhz as IF
Thank you for reply...

73  John  PA7JB




Op 12-11-2020 om 20:05 schreef Roger Ray via groups.io:

Hi Barry, I need to draw it really. However if you look down on the switch, with the antenna port at 12.00. The mixer rf port is on the 3.00 wg switch port. The wg 6.00 port connects to waveguide going round to the mixer LO port. The Multiplier connects to the switch 9.00 port.
Tx . the LO links to Ant port.
RX . Ant connects to mixer RF, plus the Multiplier connects via waveguide to mixer LO port.

I hope that makes sense

Roger
G8CUB


On 12 Nov 2020, at 18:31, Barry VE4MA <ve4ma@...> wrote:


GE Roger,

I don't understand how you are configuring  the WG switch to do that?  I assume it is a standard 4 port switch without the thru position? Can you explain a little more?
Thanks

Best 73
Barry VE4MA



Re: Cutting Fluids

Dave
 

I agree with Ray’s suggestion, and if you use a pillar drill for the hole , then the tap will naturally follow the square line of the hole. 
David G4GLT.


On 12 Nov 2020, at 21:57, Raymond Brooks <g8kps@...> wrote:


Ian, one way to keep the tap vertical is to put it in a piller drill, disconnect from mains and disconnect drive belt and turn by hand with light downward pressure.

Alternatively make a guide by chucking a piece of steel in lathe, face off and drill a guide hole the size of the tap, part off at convenient length. Place faced end over hole hold in place and insert tap, I think you get the idea.

Paraffin isn't available as once it was I have used both heating oil and diesel wth good effect when taping aluminium, except for the smell.

On 12 Nov 2020 11:11 am, Colin Ranson <g8lbs@...> wrote:

Roger,

 

Concur with Waxoyl,  My automotive supply company used to sell it, one day we had a leaking 5l tin, very useful stuff for all sorts of non-critical lubrication jobs.  Still got some of it after 30 years – not used it for tapping though – will try it next time.

 

Regards to all, - still building my 73 ele QLY for 9cm !

 

Colin de G8LBS.

 

Sent from Mail for Windows 10

 

From: R Hopkins via groups.io
Sent: 11 November 2020 23:35
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] Cutting Fluids

 


I've used Waxoyl the car undersealer for over 40 years. Works well when tapping aluminium with small
taps. I think it has a paraffin base but could be wrong. I haven't snapped many taps in that time.

I keep a jar of it next to my pillar drill.
 Roger   GW4NOS

 On Tue, 10 Nov 2020 14:51:53 +0000 (UTC), you wrote:

>
> Are you using any cutting fluid?  
>That reduces the chances of breaking a tap at least 10 dB.
>Can't speak for the UK, but around here the tool stores do sell 
>Aluminum specific cutting fluid.  Greatly reduces the effort needed to 
>turn the tap and makes very clean chips.  Might be worth a quick search.  
>
>
>
>
>    On Tuesday, November 10, 2020, 4:23:16 AM CST, Ian White <gm3sek@...> wrote:
>
>
>One of the next jobs here will be to drill a precise pattern of holes in the heatsink of an existing SSPA, and tap them for M2.5 screws.
>
>
>The heatsink will just about balance on the table of the drill press, so drilling the 2.05mm holes shouldn't be too much of a problem. But I'm very worried about breaking a tap, because then I'm really in trouble - there'll be no way forward and no way back.
>
>
>Any suggestions, please?
>
>
>Methods I've already tried: Doing it freehand with traditional T-shaped tap wrench is very dodgy, because I find the rotating wrist action is a very good way to snap a fragile tap. Tapping holes on the drill press (with the belt removed, of course) has never worked well for me either. It requires two right arms, and the return spring is far too strong which ruins the all-important 'feel'.
>
>
>How about a pin chuck with an ordinary control knob attached to the spindle? One hand can concentrate entirely on holding the spindle straight, while the other one very gently and carefully rotates the knob.
>
>
>A final thought: any recommendations for lubricating the steel tap in hard aluminium, please?
>
>
>73 from Ian GM3SEK
>
>
>
>
>






 



--
Raymond G8KPS


Re: Cutting Fluids

Raymond Brooks
 

Ian, one way to keep the tap vertical is to put it in a piller drill, disconnect from mains and disconnect drive belt and turn by hand with light downward pressure.

Alternatively make a guide by chucking a piece of steel in lathe, face off and drill a guide hole the size of the tap, part off at convenient length. Place faced end over hole hold in place and insert tap, I think you get the idea.

Paraffin isn't available as once it was I have used both heating oil and diesel wth good effect when taping aluminium, except for the smell.

On 12 Nov 2020 11:11 am, Colin Ranson <g8lbs@...> wrote:

Roger,

 

Concur with Waxoyl,  My automotive supply company used to sell it, one day we had a leaking 5l tin, very useful stuff for all sorts of non-critical lubrication jobs.  Still got some of it after 30 years – not used it for tapping though – will try it next time.

 

Regards to all, - still building my 73 ele QLY for 9cm !

 

Colin de G8LBS.

 

Sent from Mail for Windows 10

 

From: R Hopkins via groups.io
Sent: 11 November 2020 23:35
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] Cutting Fluids

 


I've used Waxoyl the car undersealer for over 40 years. Works well when tapping aluminium with small
taps. I think it has a paraffin base but could be wrong. I haven't snapped many taps in that time.

I keep a jar of it next to my pillar drill.
 Roger   GW4NOS

 On Tue, 10 Nov 2020 14:51:53 +0000 (UTC), you wrote:

>
> Are you using any cutting fluid?  
>That reduces the chances of breaking a tap at least 10 dB.
>Can't speak for the UK, but around here the tool stores do sell 
>Aluminum specific cutting fluid.  Greatly reduces the effort needed to 
>turn the tap and makes very clean chips.  Might be worth a quick search.  
>
>
>
>
>    On Tuesday, November 10, 2020, 4:23:16 AM CST, Ian White <gm3sek@...> wrote:
>
>
>One of the next jobs here will be to drill a precise pattern of holes in the heatsink of an existing SSPA, and tap them for M2.5 screws.
>
>
>The heatsink will just about balance on the table of the drill press, so drilling the 2.05mm holes shouldn't be too much of a problem. But I'm very worried about breaking a tap, because then I'm really in trouble - there'll be no way forward and no way back.
>
>
>Any suggestions, please?
>
>
>Methods I've already tried: Doing it freehand with traditional T-shaped tap wrench is very dodgy, because I find the rotating wrist action is a very good way to snap a fragile tap. Tapping holes on the drill press (with the belt removed, of course) has never worked well for me either. It requires two right arms, and the return spring is far too strong which ruins the all-important 'feel'.
>
>
>How about a pin chuck with an ordinary control knob attached to the spindle? One hand can concentrate entirely on holding the spindle straight, while the other one very gently and carefully rotates the knob.
>
>
>A final thought: any recommendations for lubricating the steel tap in hard aluminium, please?
>
>
>73 from Ian GM3SEK
>
>
>
>
>






 



--
Raymond G8KPS


Re: 47 GHz

Barry VE4MA <ve4ma@...>
 




GE Roger,

Thanks for that.! Yes a picture helps.

I have never had to go that way , so never thought about it....it is a nice option 

I have not seen any fundamental mixers for 40 ( 47 GHz) , usually the LO multiplier is built in .

Best 73
Barry VE4MA


Re: EMF Exposure - RSGB Latest Update

Brian Howie GM4DIJ
 

I've been looking at the Ofcom spreadsheet and been comparing with others including my own calculations. It looks like Ofcom have included "ground gain" in the calculations - roughly 2.56 times. I'm a bit uneasy about that being included for close in to the antenna cases. I might comment on it. At the very least that assumption should be stated.

Brian GM4DIJ


Re: 47 GHz

Paul G8KFW
 

Hi Roger

 

There were a lot of 3 port  waveguide switches in wave guide 22  available and these are also usable for 47 ghz

 

Paul

 


From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of Roger Ray via groups.io
Sent: 12 November 2020 19:05
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] 47 GHz

 

Hi Barry, I need to draw it really. However if you look down on the switch, with the antenna port at 12.00. The mixer rf port is on the 3.00 wg switch port. The wg 6.00 port connects to waveguide going round to the mixer LO port. The Multiplier connects to the switch 9.00 port.

Tx . the LO links to Ant port.

RX . Ant connects to mixer RF, plus the Multiplier connects via waveguide to mixer LO port.

 

I hope that makes sense

 

Roger

G8CUB



On 12 Nov 2020, at 18:31, Barry VE4MA <ve4ma@...> wrote:



GE Roger,

 

I don't understand how you are configuring  the WG switch to do that?  I assume it is a standard 4 port switch without the thru position? Can you explain a little more?

Thanks

 

Best 73

Barry VE4MA

 

No virus found in this message.
Checked by AVG - www.avg.com
Version: 2016.0.8048 / Virus Database: 4793/15886 - Release Date: 08/14/18
Internal Virus Database is out of date.


--
Paul Bicknell G8KFW   South Coast UK


Re: 47 GHz

Roger Ray
 

Hi Barry, I need to draw it really. However if you look down on the switch, with the antenna port at 12.00. The mixer rf port is on the 3.00 wg switch port. The wg 6.00 port connects to waveguide going round to the mixer LO port. The Multiplier connects to the switch 9.00 port.
Tx . the LO links to Ant port.
RX . Ant connects to mixer RF, plus the Multiplier connects via waveguide to mixer LO port.

I hope that makes sense

Roger
G8CUB


On 12 Nov 2020, at 18:31, Barry VE4MA <ve4ma@...> wrote:


GE Roger,

I don't understand how you are configuring  the WG switch to do that?  I assume it is a standard 4 port switch without the thru position? Can you explain a little more?
Thanks

Best 73
Barry VE4MA


47 GHz

Barry VE4MA <ve4ma@...>
 

GE Roger,

I don't understand how you are configuring  the WG switch to do that?  I assume it is a standard 4 port switch without the thru position? Can you explain a little more?
Thanks

Best 73
Barry VE4MA


Re: First UKuW group talk tomorrow the 11th of November

Pete - GM4BYF
 

I was about to ask the same question.

73
Pete GM4BYF
On 12/11/20 16:20, militaryoperator via groups.io wrote:


Millimetre Waves – By Chris Whitmarsh G0FDZ

A UK Microwave Group Online Lecture streamed by the BATC
Wednesday 11th November 2020 at 20:00


Is it recorded anywhere, youtube? etc. 

Ben

--------------------------------------
Curator, Owner and Display coordinator
Military Wireless Museum
Kidderminster, UK.

This message was meant for the recipient
Any likeness to persons living or dead is odd
---------------------------------------


--
vry 73
Pete GM4BYF


Re: First UKuW group talk tomorrow the 11th of November

militaryoperator
 


Millimetre Waves – By Chris Whitmarsh G0FDZ

A UK Microwave Group Online Lecture streamed by the BATC
Wednesday 11th November 2020 at 20:00


Is it recorded anywhere, youtube? etc. 

Ben

--------------------------------------
Curator, Owner and Display coordinator
Military Wireless Museum
Kidderminster, UK.

This message was meant for the recipient
Any likeness to persons living or dead is odd
---------------------------------------

5801 - 5820 of 65009