Date   

Re: Unidentified Connector

Tim Clark
 

Hi Dave,

    Looks like an SMC to me.

This chart very handy for this sort of thing: https://www.fairviewmicrowave.com/t-interface-guide.aspx

Tim, MW0RUD

On 12/10/2020 4:48 pm, Dave G8GKQ wrote:
Grateful if anyone can identify the 2 connectors on the right of this picture.  Same thread and similar size to an SMA, but a male pin and and extended cylindrical outer barrel.

SMA on the left for a size comparison.

Dave, G8GKQ


Re: Unidentified Connector

Dave G8GKQ
 

Grateful if anyone can identify the 2 connectors on the right of this picture.  Same thread and similar size to an SMA, but a male pin and and extended cylindrical outer barrel.

SMA on the left for a size comparison.

Dave, G8GKQ


Unidentified Connector

Dave G8GKQ
 

 


Re: The Perfect Microwave Absorber

Martin Phillips G4CIO
 

Quick answer: yes.

Longer answer: SHC of pure sugar around 1.4 J/g/K, jam is roughly 50% sugar. Raisins seem to be 1.63 J/g/K but oddly currants (very similar one might think) 4.06. <https://www.engineeringtoolbox.com/specific-heat-capacity-food-d_295.html>



On 12/10/20 3:56 PM, Andy G4JNT wrote:

Is the specific heat of jam / fruit significantly less than that of water ?   Coz that's the only real explanation I can think of - the cooker isn't generating more power than it should.





The Perfect Microwave Absorber

Andy G4JNT
 

The chaps at Mr Kipling cakes need to be recruited at certain microwave companies that make dummy loads.  They appear to have invented the perfect microwave absorber material.

Mr. Kipling Eccles cakes come with a warning "Do Not Microwave"  Well ...
Rules are for the Guidance of etc etc. ...
So ten seconds at 850 Watts

And were the innards HOT !

Each cake weighs 50g and lets assume this is all the fruit/jam inside
Energy = 8500 Joules, which, assuming the specific heat of Eccles cake innards  is the same as that of water, 4200J/K/kg, should have raised the temperature  40C.   They would have been about 15C to start with, but those innards tasted a lot hotter than 55C.

Is the specific heat of jam / fruit significantly less than that of water ?   Coz that's the only real explanation I can think of - the cooker isn't generating more power than it should.




Original JVL Waveguide Tranceiver

Adrian G4UVZ
 

Original G3JVL waveguide Transceiver contained within a diecast box complete with TCXO changeover etc etc 

Open to offers


10 GHz Portable Transceiver

Adrian G4UVZ
 

 10 GHz narrow band transceiver base on the famous ' White Box'

 

https://www.qsl.net/ve3hht/Download_Files/VE3SMA%20WHITEBOXrev2.pdf


Has a modified LNB preamp and a WDG PA. Changeover is by a chunky waveguide switch


I have tested it and it is very sensitive receiving SCX beacon .in my shack on the integral offset dish.

 

It transmits > 250 mwatts at 10 Ghz for 2 watts 2m input.

Operates on 12 Volts 

Looking £125 plus carriage.


Re: Omni directional antenna for 1 to 20 ghz

KENT BRITAIN
 

I'll keep that in mind.

Also a member of the Cyrpto museum at Bletchley Park.



On Sunday, October 11, 2020, 10:34:51 AM CDT, Steve - WB0DBS <steve-krull@...> wrote:


Kent,

If you happen to get out to San Jose I can put you in touch with a crypto guy that has two complete, original Enigmas, along with loads of other crypto kit from the earliest days to the not-so-distant past. He wrote a book on the history of cryptography and has spoken at numerous gatherings of black hats. He’s an interesting chap and we discovered we had some connections from back in the day. 

73,

Steve
WB0DBS



On Oct 11, 2020, at 10:12 AM, KENT BRITAIN <wa5vjb@...> wrote:


Hi Keith

Have a look at http://www.wa5vjb.com

I have 2-26 GHz and 700 MHz-26 GHz Omni's

And Log Periodics from 400 MHz to 11 GHz.

The 9-25 GHz Vivaldi's are basically rated to the SMA connector.
Using 'K' connectors I know several labs using them up to 35 GHz.

Yea, really was hoping to visit F/haven again.   Last time I bough an
Enigma Clone and have several friends hoping I can get a few more.

Cheers   Kent WA5VJB/G8EMY   (I know, an '8', but it is a full license)

On Sunday, October 11, 2020, 8:33:06 AM CDT, Keith <keith@...> wrote:


While playing with my new toys, an Adalm Pluto and a Nuand Rf Blade v2, I find the need for an omnidirectional antenna, or at very lease a reasonable gain directional antenna that i can mount on a small rotator.
I remember chatting with Kent and Sam at F/ haven in 2018 about wideband antennas but my searches are virtually friutless.
Is there anything out there that could be useful ?
Bear in mind I'm in Perth , the most isolated capital in the world so the dx to the rest of Australia isnt going to happen.
Basically just something I can use to cover the spectrum of 1 ghz and up to keep me amused.
I'm planning on both 8 ghz and 32 ghz feeds to a dish, from 60cms up to 2.4 mtrs for the DSN activity but just want to play around on local stuff.
You never know what you may hear :(
Just asking ;)
Cheers
Keith


Re: Omni directional antenna for 1 to 20 ghz

Steve - WB0DBS
 

Kent,

If you happen to get out to San Jose I can put you in touch with a crypto guy that has two complete, original Enigmas, along with loads of other crypto kit from the earliest days to the not-so-distant past. He wrote a book on the history of cryptography and has spoken at numerous gatherings of black hats. He’s an interesting chap and we discovered we had some connections from back in the day. 

73,

Steve
WB0DBS



On Oct 11, 2020, at 10:12 AM, KENT BRITAIN <wa5vjb@...> wrote:


Hi Keith

Have a look at http://www.wa5vjb.com

I have 2-26 GHz and 700 MHz-26 GHz Omni's

And Log Periodics from 400 MHz to 11 GHz.

The 9-25 GHz Vivaldi's are basically rated to the SMA connector.
Using 'K' connectors I know several labs using them up to 35 GHz.

Yea, really was hoping to visit F/haven again.   Last time I bough an
Enigma Clone and have several friends hoping I can get a few more.

Cheers   Kent WA5VJB/G8EMY   (I know, an '8', but it is a full license)

On Sunday, October 11, 2020, 8:33:06 AM CDT, Keith <keith@...> wrote:


While playing with my new toys, an Adalm Pluto and a Nuand Rf Blade v2, I find the need for an omnidirectional antenna, or at very lease a reasonable gain directional antenna that i can mount on a small rotator.
I remember chatting with Kent and Sam at F/ haven in 2018 about wideband antennas but my searches are virtually friutless.
Is there anything out there that could be useful ?
Bear in mind I'm in Perth , the most isolated capital in the world so the dx to the rest of Australia isnt going to happen.
Basically just something I can use to cover the spectrum of 1 ghz and up to keep me amused.
I'm planning on both 8 ghz and 32 ghz feeds to a dish, from 60cms up to 2.4 mtrs for the DSN activity but just want to play around on local stuff.
You never know what you may hear :(
Just asking ;)
Cheers
Keith


Re: Omni directional antenna for 1 to 20 ghz

KENT BRITAIN
 

Hi Keith

Have a look at http://www.wa5vjb.com

I have 2-26 GHz and 700 MHz-26 GHz Omni's

And Log Periodics from 400 MHz to 11 GHz.

The 9-25 GHz Vivaldi's are basically rated to the SMA connector.
Using 'K' connectors I know several labs using them up to 35 GHz.

Yea, really was hoping to visit F/haven again.   Last time I bough an
Enigma Clone and have several friends hoping I can get a few more.

Cheers   Kent WA5VJB/G8EMY   (I know, an '8', but it is a full license)

On Sunday, October 11, 2020, 8:33:06 AM CDT, Keith <keith@...> wrote:


While playing with my new toys, an Adalm Pluto and a Nuand Rf Blade v2, I find the need for an omnidirectional antenna, or at very lease a reasonable gain directional antenna that i can mount on a small rotator.
I remember chatting with Kent and Sam at F/ haven in 2018 about wideband antennas but my searches are virtually friutless.
Is there anything out there that could be useful ?
Bear in mind I'm in Perth , the most isolated capital in the world so the dx to the rest of Australia isnt going to happen.
Basically just something I can use to cover the spectrum of 1 ghz and up to keep me amused.
I'm planning on both 8 ghz and 32 ghz feeds to a dish, from 60cms up to 2.4 mtrs for the DSN activity but just want to play around on local stuff.
You never know what you may hear :(
Just asking ;)
Cheers
Keith


Omni directional antenna for 1 to 20 ghz

Keith
 

While playing with my new toys, an Adalm Pluto and a Nuand Rf Blade v2, I find the need for an omnidirectional antenna, or at very lease a reasonable gain directional antenna that i can mount on a small rotator.
I remember chatting with Kent and Sam at F/ haven in 2018 about wideband antennas but my searches are virtually friutless.
Is there anything out there that could be useful ?
Bear in mind I'm in Perth , the most isolated capital in the world so the dx to the rest of Australia isnt going to happen.
Basically just something I can use to cover the spectrum of 1 ghz and up to keep me amused.
I'm planning on both 8 ghz and 32 ghz feeds to a dish, from 60cms up to 2.4 mtrs for the DSN activity but just want to play around on local stuff.
You never know what you may hear :(
Just asking ;)
Cheers
Keith


Re: QO-100 and 13cms today from Cumbria

Nick Gregory G0HIK
 

From around 10:30 UTC.

2.5w to a POTY and 60cm dish.

Nick G0HIK


QO-100 and 13cms today from Cumbria

Nick Gregory G0HIK
 

I'm going to be QRV  on QO-100 today from a Lake District Fell. Whitfell G/LD-032 IO84IH
I'll be doing SOTA, I'm also hoping to work Jack GM4COX on a SOTA on 13cms direct.

I've got a good take off from North ,west to South, from a 2000ft vantage. If anyone fancies a contact on 13cms , message on here please.

73s

Nick G0HIK


Activity List for the UK Microwave Group 24/47/76GHz Contests - Sunday 18th October

John Quarmby
 

The third and final session in the curtailed UKuG mm-Wave contest series takes place on Sunday 18th October, from 0900-1700 GMT (1000 - 1800 BST).

Bands are 24GHz, 47GHz, and 76GHz. Roving is permitted, indeed encouraged. If roving please note in your log the 8 character locator where each QSO took place.

Please post your plans for operation on UKMicrowaves and I will compile an activity list to send out next Saturday morning.

Please use this standard format to make editing the list easier:

Callsign: G3XDY
Locator: JO02OB57
Bands: 24GHz    3W 48cm dish
Talkback: ON4KST, Zello SHF Chat, 144.390MHz
Times: Various depending on activity

73

John G3XDY


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Re: 3cm and 6cm dualband feed.

KENT BRITAIN
 

Not if you add a reflector.   There would be a different phase center for 
3 and 6 cm.    Unless you had two reflectors one tuned to each frequency. 

That's an antenna really designed for the Time Domain rather than 
the Frequency Domain.    But I look forward to the results from    
your field tests.  Kent



On Saturday, October 10, 2020, 3:44:58 PM CDT, Alan Beard <beardal@...> wrote:




> And we could get quite a discussion going on just where the phase center is.

Isn't this what their antenna is designed for, the phase centre being as close as
possible over a wide range of frequency for radar?

Back to my suggestion re feed, actually to make it very easy to build.

Alan VK2ZIW 


On Fri, 9 Oct 2020 21:30:14 +0000 (UTC), KENT BRITAIN wrote
> That is an Ultra Wideband Loop antenna.  Been around for quite some time.
> Even that paper is 9 years old.
>
> Note that the SWR is plotted in both frequency and Nano Seconds.
>
> I'm not saying you cannot make it into a dish feed, but it would take a lot of work.
> Reflector spacing that works for 6 cm would be a poor choice for 3 cm.
> And we could get quite a discussion going on just where the phase center is.
>
> Several simpler choices that are already 50 Ohm match over a broad range of
> frequencies.        Kent WA5VJB/2E0VAA/G8EMY
>
> On Friday, October 9, 2020, 4:12:54 PM CDT, Alan Beard <beardal@...> wrote:
>
> Have you seen this, the Shorted Bow Tie?
>
> https://core.ac.uk/download/pdf/70589636.pdf
>

> Now, note the back plane, could it be a Corner Reflector?
>

> As, I'm not short of "space" as in the medical use of this antenna type,
> a 90 deg corner with the petals coming out at 60 deg ie. 15 deg off the sides.
>

> Next, the balun. (Why?)
>

> With thin coax, 1/8 in. hardline, come through the backplane and wrap it around the centreline
> of the petal down to it's tip where the outer is soldered onto it's petal and the inner goes to the
> tip of the other petal. 

>

> Ah, these antenna gurus miss the obvious.
>

> The feed impedance, this is a bit confusing, one article, around 30 ohms balanced feed, the other,  2x 50 ohms
> with the petals modified wider rounded at the tip.
>

> Any thoughts?
>

> Alan VK2ZIW
>

> On Wed, 07 Oct 2020 23:23:05 -0700, Daniel DL3IAE wrote
> ... and if you switch both coaxial relays together, isolation is not a problem.
> Requires just a single sequenzer.
>
> Daniel

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

OpenWebMail 2.53, nothing in the cloud.


Re: 3cm and 6cm dualband feed.

Alan Beard
 



> And we could get quite a discussion going on just where the phase center is.

Isn't this what their antenna is designed for, the phase centre being as close as
possible over a wide range of frequency for radar?

Back to my suggestion re feed, actually to make it very easy to build.

Alan VK2ZIW 


On Fri, 9 Oct 2020 21:30:14 +0000 (UTC), KENT BRITAIN wrote

> That is an Ultra Wideband Loop antenna.  Been around for quite some time.
> Even that paper is 9 years old.
>
> Note that the SWR is plotted in both frequency and Nano Seconds.
>
> I'm not saying you cannot make it into a dish feed, but it would take a lot of work.
> Reflector spacing that works for 6 cm would be a poor choice for 3 cm.
> And we could get quite a discussion going on just where the phase center is.
>
> Several simpler choices that are already 50 Ohm match over a broad range of
> frequencies.        Kent WA5VJB/2E0VAA/G8EMY
>
> On Friday, October 9, 2020, 4:12:54 PM CDT, Alan Beard <beardal@...> wrote:
>
> Have you seen this, the Shorted Bow Tie?
>
> https://core.ac.uk/download/pdf/70589636.pdf
>

> Now, note the back plane, could it be a Corner Reflector?
>

> As, I'm not short of "space" as in the medical use of this antenna type,
> a 90 deg corner with the petals coming out at 60 deg ie. 15 deg off the sides.
>

> Next, the balun. (Why?)
>

> With thin coax, 1/8 in. hardline, come through the backplane and wrap it around the centreline
> of the petal down to it's tip where the outer is soldered onto it's petal and the inner goes to the
> tip of the other petal. 

>

> Ah, these antenna gurus miss the obvious.
>

> The feed impedance, this is a bit confusing, one article, around 30 ohms balanced feed, the other,  2x 50 ohms
> with the petals modified wider rounded at the tip.
>

> Any thoughts?
>

> Alan VK2ZIW
>

> On Wed, 07 Oct 2020 23:23:05 -0700, Daniel DL3IAE wrote
> ... and if you switch both coaxial relays together, isolation is not a problem.
> Requires just a single sequenzer.
>
> Daniel

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

OpenWebMail 2.53, nothing in the cloud.


24 Ghz on Sunday 18th

Paul G8AQA
 

We are proposing to go out roving with the 24GHz kit on Sunday for the 24GHz etc Championship.  We intend to visit a site on the Welsh border on the way up to Lancashire, where we hope to visit a number of sites.  We hope to work as many stations as possible using the callsign G(W)6ZME/P  Note the G6. This is one of the callsigns of Telford and District Amateur Radio Society.  We hope to encourage more Northerly activity on the band.

We will not have 2m talkback but will probably have KST, Zello and telephone - 07967 272 185.

Let us know where you are and info on any good sites that would make a good path.

We are hoping that the Covid rules or the weather will not clip our wings.

Paul G8AQA
Heather M0HMO


Re: 3cm and 6cm dualband feed.

KENT BRITAIN
 

That is an Ultra Wideband Loop antenna.  Been around for quite some time.
Even that paper is 9 years old.

Note that the SWR is plotted in both frequency and Nano Seconds.

I'm not saying you cannot make it into a dish feed, but it would take a lot of work.
Reflector spacing that works for 6 cm would be a poor choice for 3 cm.
And we could get quite a discussion going on just where the phase center is.

Several simpler choices that are already 50 Ohm match over a broad range of
frequencies.        Kent WA5VJB/2E0VAA/G8EMY

On Friday, October 9, 2020, 4:12:54 PM CDT, Alan Beard <beardal@...> wrote:


Have you seen this, the Shorted Bow Tie?
https://core.ac.uk/download/pdf/70589636.pdf

Now, note the back plane, could it be a Corner Reflector?

As, I'm not short of "space" as in the medical use of this antenna type,
a 90 deg corner with the petals coming out at 60 deg ie. 15 deg off the sides.

Next, the balun. (Why?)

With thin coax, 1/8 in. hardline, come through the backplane and wrap it around the centreline
of the petal down to it's tip where the outer is soldered onto it's petal and the inner goes to the
tip of the other petal. 

Ah, these antenna gurus miss the obvious.

The feed impedance, this is a bit confusing, one article, around 30 ohms balanced feed, the other,  2x 50 ohms
with the petals modified wider rounded at the tip.

Any thoughts?

Alan VK2ZIW

On Wed, 07 Oct 2020 23:23:05 -0700, Daniel DL3IAE wrote
> ... and if you switch both coaxial relays together, isolation is not a problem.
> Requires just a single sequenzer.
>
> Daniel


Re: 3cm and 6cm dualband feed.

Alan Beard
 

Have you seen this, the Shorted Bow Tie?
https://core.ac.uk/download/pdf/70589636.pdf

Now, note the back plane, could it be a Corner Reflector?

As, I'm not short of "space" as in the medical use of this antenna type,
a 90 deg corner with the petals coming out at 60 deg ie. 15 deg off the sides.

Next, the balun. (Why?)

With thin coax, 1/8 in. hardline, come through the backplane and wrap it around the centreline
of the petal down to it's tip where the outer is soldered onto it's petal and the inner goes to the
tip of the other petal. 

Ah, these antenna gurus miss the obvious.

The feed impedance, this is a bit confusing, one article, around 30 ohms balanced feed, the other,  2x 50 ohms
with the petals modified wider rounded at the tip.

Any thoughts?

Alan VK2ZIW

On Wed, 07 Oct 2020 23:23:05 -0700, Daniel DL3IAE wrote
> ... and if you switch both coaxial relays together, isolation is not a problem.
> Requires just a single sequenzer.
>
> Daniel
> _._,_._,_


Re: Shaft Encoder Details

Clint Sharp <cjaysharp@...>
 

On Fri, 9 Oct 2020 at 19:12, Chris Bartram G4DGU <chris@...> wrote:
I found what is fairly obviously a shaft encoder while tidying-up my
garage today. It has the HP logo and a type no. QEDS-7000. Does any one
have an a old HP data book with the details of it. A quick on-line
search reveals nothing.

73

Chris G4DGU








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