Date   

Re: 122GHz

Derek Kozel <derek.kozel@...>
 

Hi Barry,

The local group here has several of their eval chips and have been working to make 122 GHz radios from them. So far it has been going well. I talked to the CTO of Silicon Radar when he was in town for the International Microwave Symposium and he was excited by the interest outside of the radar realm. At that time the target price for the dev board was under $100 USD, but it will be interesting to see what price point they ended up meeting.

Cheers,
Derek

On Fri, Oct 28, 2016 at 9:43 AM, g4bao john@... [ukmicrowaves] <ukmicrowaves@...> wrote:
 

No prices = we're embarrassed to tell you how stupidly high our prices are......


On 28 Oct 2016 5:02 pm, "Barry Chambers b.chambers@... [ukmicrowaves]" <ukmicrowaves@...> wrote:
 

The following link might be of interest. No prices!

http://www.siliconradar.de/evalkits_e.html

--

73

Barry, G8AGN



Re: 122GHz

g4bao
 

No prices = we're embarrassed to tell you how stupidly high our prices are......


On 28 Oct 2016 5:02 pm, "Barry Chambers b.chambers@... [ukmicrowaves]" <ukmicrowaves@...> wrote:
 

The following link might be of interest. No prices!

http://www.siliconradar.de/evalkits_e.html

--

73

Barry, G8AGN


122GHz

Barry Chambers
 

The following link might be of interest. No prices!

http://www.siliconradar.de/evalkits_e.html


--

73

Barry, G8AGN


Re: New file uploaded to ukmicrowaves

Paul G8AQA
 

Hi Rien,

Thanks for the uploads. It looks as if my switches are similar but with a lower frequency spec. I suspect I will get the info I need from these.

Regards,
Paul
G8AQA


New file uploaded to ukmicrowaves

ukmicrowaves@...
 

Hello,


This email message is a notification to let you know that
a file has been uploaded to the Files area of the ukmicrowaves
group.


File : /HP-pinswitches.pdf
Uploaded by : rien_pa0jme <pa0jme@veron.nl>
Description : HP data on some of the HP33xxx series of pin-switches


You can access this file at the URL:
https://groups.yahoo.com/neo/groups/ukmicrowaves/files/HP-pinswitches.pdf


To learn more about file sharing for your group, please visit:
https://help.yahoo.com/kb/index?page=content&y=PROD_GRPS&locale=en_US&id=SLN15398


Regards,


rien_pa0jme <pa0jme@veron.nl>


Re: Right Angled SMA at 10GHz

Andy G4JNT
 

Issue sidestepped.  Managed to shoehorn with carefully use of conformable semirigid:


Consensus seems to be  "... possible, but better not to use them at 10GHz ..."


'jnt










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Re: Right Angled SMA at 10GHz

Paul G8AQA
 

Hi Rein,
That may give me some clues. Scans would be appreciated. It might be a good idea to put them in the files section of the group so everyone can refer to them.

&3
Paul
G8AQA


Re: Right Angled SMA at 10GHz

pa0jme@...
 

Hi Paul, I do not have data on these particular ones, but found some data on similar HP types 33016c 33102 and 33104. I can scan and pdf them if you like
73es Rien PA0JME


Re: 1/4" Semi-rigid Coax

DougF VK4OE
 

Hello Gordon and other readers.

'The RF Shop', a Queensland-originated operation that now is in South Australia and the UK as well, has stocked that large sized semi-rigid coax plus good quality Taiwanese-made connectors for it - at least I have made purchases through them here in VK.  Go to:  https://www.rfshop.co.uk/

If they don't have such items in stock for immediate delivery in the UK, I'm sure that they are able to get it/them in in a few days.

Very best wishes,

--Doug Friend, VK4OE.

p.s.  The usual disclaimer about having no relationship with The RF Shop other than having been a satisfied customer many times over.


On 28/10/2016 07:43, GORDONJ REASON gordonj.reason@... [ukmicrowaves] wrote:
 

-------

If you or this group can find some, and it is expensive and rare, so larger diameter semi rigid, with N type connectors ? ..... does anyone know of a source .....


Re: Right Angled SMA at 10GHz

Dr. David Kirkby (Kirkby Microwave Ltd) <drkirkby@...>
 

On 27 Oct 2016 11:25, "Andy Talbot andy.g4jnt@... [ukmicrowaves]" <ukmicrowaves@...> wrote:
>
> I remember somewhere reading comments that right angled SMA adapters have a lower frequency limit than straight through ones; at least, the sharp angled ones
...
> In the absence of a NETAN going that high, I can't make a proper test
>
> Andy  G4JNT

I don't think that they will be good,  but some are worse than others.

If you want to make up some straight SMA to SMA cables,  I can measure them for you on my HP 8720D vector network analyzer, which goes up to 20 GHz.

An actual measurement on your own devices will beat any theories or measurement results on other people's devices.

Dave, G8WRB.


waveguide on ebay

ian hope (2E0IJH)
 

Came across this lot on ebay, whilst looking for some other bits, I know nothing about waveguide beyond my level.
 
But thought link might be some use, http://www.ebay.co.uk/sch/cathodefollower/m.html?item=112184166779&hash=item1a1eb2897b%3Ag%3AaGMAAOSwZJBX--TM&rt=nc&_trksid=p2047675.l2562
 
Ian
2E0IJH


Re: Right Angled SMA at 10GHz

mjniman@...
 

In Marconi I remember we banned rightangle SMAs for anywhere near X-Band.
Not just due to poor match , but because of their potential to overmode or breakdown

The only exception was some very expensive Astrolab curved SMA-f to flanged dielectric ones

Murray G6JYB


Re: Right Angled SMA at 10GHz

John Quarmby
 

If you mean RG401 or UT250, the 0.25 inch version of semi-rigid, I have bought it (and the hand-formable version) at reasonable prices at rallies (mainly in Europe rather than the UK though).
You can also buy it new from Farnell - order code 2064898.

N Connectors for RG401 are available from Mouser or Digikey.

73

John G3XDY


On 27/10/2016 21:43, GORDONJ REASON gordonj.reason@... [ukmicrowaves] wrote:

During my employed years , in the microwave industry , we would never use 90 degree angled connectors ., as , you will be aware , microwaves , do not like going round corners ........... full stop .

We always preferred the swept corners , as they maintained a better match , although they could not be used in measurementa for phase measurements , as the swept bends could not be guaranteed to give repeatable measurement results ........... 

So , my advice , is to give the 90 degree stuff a miss , above 70 cems ..... better to make some semi rigid , diy , bends .....

If you or this group , can find some , and it is expensive and rare , so larger diameter semi rigid , with N type connectors ? ..... does anyone know of a source ..... 


On 27 October 2016 at 11:25 "Andy Talbot andy.g4jnt@... [ukmicrowaves]" wrote:

 

 

I remember somewhere reading comments that right angled SMA adapters have a lower frequency limit than straight through ones; at least, the sharp angled ones like the two on the right of    http://www.g4jnt.com/DropF/sma_rangles.jpg   .   The gentle curved on one on the left is known to behave well.

BUT, does anyone know for sure just how the sharp right angled ones really behave at 10GHz ?
In the absence of a NETAN going that high, I can't make a proper test

Andy  G4JNT



 


 


 





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New TS2000 file loaded to hupRF website

dave powis <g4hup@...>
 

Hi all,

Excuse the bandwidth, but I've just uploaded a set of notes to my PAT page on using a PAT to fed an SDR as a 2nd independent receiver with the HF/50MHz band coverage.  Given the Rx architecture of the TS2k, it is not possible to cover all it's bands with a single PAT unit - a separate one would be needed for 144/430MHz coverage, connected at a different point in the rig.

Please go to http://huprf.com/huprf/pat-board/ and scroll down to the second table on the page to find the link to these notes.

73,
Dave, G4HUP

http://hupRF.com
twitter  @hupRF


Re: Right Angled SMA at 10GHz

GORDONJ REASON <gordonj.reason@...>
 

During my employed years , in the microwave industry , we would never use 90 degree angled connectors ., as , you will be aware , microwaves , do not like going round corners ........... full stop .

We always preferred the swept corners , as they maintained a better match , although they could not be used in measurementa for phase measurements , as the swept bends could not be guaranteed to give repeatable measurement results ........... 

So , my advice , is to give the 90 degree stuff a miss , above 70 cems ..... better to make some semi rigid , diy , bends .....

If you or this group , can find some , and it is expensive and rare , so larger diameter semi rigid , with N type connectors ? ..... does anyone know of a source ..... 


On 27 October 2016 at 11:25 "Andy Talbot andy.g4jnt@... [ukmicrowaves]" <ukmicrowaves@...> wrote:

 

 

I remember somewhere reading comments that right angled SMA adapters have a lower frequency limit than straight through ones; at least, the sharp angled ones like the two on the right of    http://www.g4jnt.com/DropF/sma_rangles.jpg   .   The gentle curved on one on the left is known to behave well.

BUT, does anyone know for sure just how the sharp right angled ones really behave at 10GHz ?
In the absence of a NETAN going that high, I can't make a proper test

Andy  G4JNT



 


 


 


IN77 square.

F9oe@...
 

Gm all ! F1SRC, F5LWX and F9OE will be  /P IN77WT fm saturday 29 1400 TU to 30 1500 TU on 6 and 3 cm. CW and SSB. See ON4KST !
73 and dx !


Re: Right Angled SMA at 10GHz

Paul G8AQA
 

I have just dismantled a piece of equipment which I presume was part of a radar system.  It has a Marconi isolator Type F1096-22 marked at 9.05Ghz  It had 2 right angle SMAs and a tee. The tees have no sign of any closure cap like the ones in the article but are marked AMERICON 26805. I wonder how good they are.   I will need to find a VNA somewhere.

 The source is marked MESL Type XS-635. It appears to be tune-able but is Rusty where the shaft goes in. I wonder what range it tunes over. It works from 12V. Has anyone any further info?  Not found anything with Google.

It also had some pin switches - HP33124A and HP33122A. Does anyone have any voltage vs isolation info on these please?

Paul
G8AQA

On 27/10/2016 14:03, geoffrey pike gi0gdp@... [ukmicrowaves] wrote:
 
I have just taken dismantled a piece of ex Tornado avionics designed for 8 -18 GHz and there are no right angle SMA bits to be seen.
All connections use normal SMA connectors and  then semi-rigid coax set as necessary.
Some time ago i built a 10 GHz transverter and used right angle plugs, these have all been removed with a noticeable improvement in
measured performance, so best avoided.
Geoff
GI0GDP


On Thursday, 27 October 2016, 11:25, "Andy Talbot andy.g4jnt@... [ukmicrowaves]" wrote:


 
I remember somewhere reading comments that right angled SMA adapters have a lower frequency limit than straight through ones; at least, the sharp angled ones like the two on the right of    http://www.g4jnt.com/DropF/sma_rangles.jpg   .   The gentle curved on one on the left is known to behave well.

BUT, does anyone know for sure just how the sharp right angled ones really behave at 10GHz ?
In the absence of a NETAN going that high, I can't make a proper test

Andy  G4JNT







Re: Right Angled SMA at 10GHz

geoffrey pike
 

I have just taken dismantled a piece of ex Tornado avionics designed for 8 -18 GHz and there are no right angle SMA bits to be seen.
All connections use normal SMA connectors and  then semi-rigid coax set as necessary.
Some time ago i built a 10 GHz transverter and used right angle plugs, these have all been removed with a noticeable improvement in
measured performance, so best avoided.
Geoff
GI0GDP


On Thursday, 27 October 2016, 11:25, "Andy Talbot andy.g4jnt@... [ukmicrowaves]" wrote:


 
I remember somewhere reading comments that right angled SMA adapters have a lower frequency limit than straight through ones; at least, the sharp angled ones like the two on the right of    http://www.g4jnt.com/DropF/sma_rangles.jpg   .   The gentle curved on one on the left is known to behave well.

BUT, does anyone know for sure just how the sharp right angled ones really behave at 10GHz ?
In the absence of a NETAN going that high, I can't make a proper test

Andy  G4JNT






Re: Right Angled SMA at 10GHz

Christopher Bartram <cbartram@...>
 

Hello Andy

The performance of right-angle plugs at 10GHz is a bit of a lottery. I've looked at quite a few cables fitted with them on the incredibly ancient (but still very useful) HP8410 VNA I use above 6GHz, where my 8753s stop. The results are incredibly mixed, and the only guideline I can offer is to beware of anything which isn't rated to >12GHz - it should be possible to look-up a manufacturer's spec. on decent flexible cables.

You are more likely get good results with connectors on proper (ie. solid jacket) semi-rigid. Some of these seem OK at 24G, but I can only make scalar measurements there using a Gunn source, and a power meter.


Vy 73

Chris
GW4DGU

--


Re: Réf. : Right Angled SMA at 10GHz

Andy G4JNT
 

That's a wonderfully useful set of measurements - tnx for posting it

Perhaps they could be persuaded to let it appear in Scatterpoint ...???

Anyway, it looks as if my suspicions were correct about those RA adapters - they are just beginning to roll off at 10GHz.  Especially the cable mout right angles.  They appear worse than the actual adapters.   Which is good, as I was on the verge of thinking of using one

No doubt quite useable in non-critical applications, such as  low level stages and after LNAs, but not in front ends.     When you see a few tenths of a dB appear as ripple (rather than raw loss appearing as a monotonic slope) , you know the match is going.    Even 0.1dB of mismatch ripple corresponds to a return loss of 16dB or a VSWR of 1.3 : 1

Andy  G4JNt



On 27 October 2016 at 11:39, 'F1CHF' F1CHF@... [ukmicrowaves] <ukmicrowaves@...> wrote:
 

some ideas an mesurements here :
 
 
F1CHF
 
 
 
 
 
Envoyé a partir de mon Minitel S3B (version 4)
-------Message original-------
 
Date : 27/10/2016 12:25:50
Sujet : [ukmicrowaves] Right Angled SMA at 10GHz
 
 

I remember somewhere reading comments that right angled SMA adapters have a lower frequency limit than straight through ones; at least, the sharp angled ones like the two on the right of    http://www.g4jnt.com/DropF/sma_rangles.jpg   .   The gentle curved on one on the left is known to behave well.

BUT, does anyone know for sure just how the sharp right angled ones really behave at 10GHz ?
In the absence of a NETAN going that high, I can't make a proper test

Andy  G4JNT