Date   

Re: 10GHz SMA to WG16

Wilko
 

I would personally go for the "brass route". I have
built a number of these sma-wg transitions. Measurements have shown that they are not at all bad. I lack equipment to measure things like
S11 at this frequency so I had to work based on mechanical dimensions and hope for the best.

Obviously the measurement results led to some smugness on my part :-)

Wilko
PA1WBU


Re: LA2T9Q ''6GHz' amplifier spec?

Keith Le Boutillier
 

Gareth

 

Take a look at https://www.ppauctions.com/lot/157880/lot-84?auction_filters=cGFnZT0z

 

And see Lot 84

 

It covers IJ bands at 400 watts its listed at £10.00 may be worth a look

 

73 Keith GU6EFB

 

From: UKMicrowaves@groups.io <UKMicrowaves@groups.io> On Behalf Of Gareth G4XAT via groups.io
Sent: 09 June 2021 08:47
To: UKMicrowaves@groups.io
Subject: [UKMicrowaves] LA2T9Q ''6GHz' amplifier spec?

 

This device is inside some cheap ALiExpress amp boards (under a tin can screen LA2T9Q). Unable to find any spec on it but wondering if it has ANY gain left at 10GHz. Very hopeful I know, but trying to raise a mW for the weekend from a Pluto 5th harmonic.
They certainly work to some degree on 5.7GHz where I got improved signals by using one in the RX chain, but other than looking at the received signal via a LNB and SDR I have no means at present of measuring any 'gain'.
The boards are typical eBay 'DC to Daylight' SMA in/out with 5vdc in, so it may be possible to swap in something of known capability at 10GHz.
Suggestions very welcome.

Gareth


Re: N plug solder for semi rigid

Keith Le Boutillier
 

Good morning all

 

See www.coax-connectors.com

 

They are UK based and have a full range of full spec connectors. I have always found them very helpful, just a happy customer

 

73 Keith GU6EFB

 

From: UKMicrowaves@groups.io <UKMicrowaves@groups.io> On Behalf Of alwyn.seeds1
Sent: 09 June 2021 08:52
To: UK Microwaves groups.io <UKMicrowaves@groups.io>
Subject: Re: [UKMicrowaves] N plug solder for semi rigid

 

Dear Ben,

 

This is now a bit of a challenge.

 

Tyco moved their production to China and the designs are different from the ex-Greenpar ones.

 

There are many distributors of N connectors who are selling parts with poor design/poor tolerances- I have measured these and they show worse return loss than what used to be available.

 

Huber and Suhner are good, also Telegartner as a lower cost option, if they meet your spec.

 

Radiall have moved the production of a lot of their N connectors to China. I have measured some samples of these and they are within spec.

 

Cinch have introduced some low spec. ranges, check spec. carefully.

 

Likewise Amphenol.

 

So, I think you now have to check spec. very carefully, and do n’t be surprised if a connector that meets the MIL spec. to 12 GHz or 18 GHz is quite pricey.

 

So far as I know, there is no longer any manufacture of N connectors in the UK.

 

Regards,

 

Alwyn G8DOH

 

 

_____________________________________________________

 

Alwyn Seeds, Director
SynOptika Ltd.,
114 Beaufort Street,
London,
SW3 6BU,
England.


SynOptika Ltd., Registered in England and Wales: No. 04606737
Registered Office: 114 Beaufort Street, London, SW3 6BU, United Kingdom.

_____________________________________________________

 


Re: N plug solder for semi rigid

alwyn.seeds1
 

Dear Ben,

This is now a bit of a challenge.

Tyco moved their production to China and the designs are different from the ex-Greenpar ones.

There are many distributors of N connectors who are selling parts with poor design/poor tolerances- I have measured these and they show worse return loss than what used to be available.

Huber and Suhner are good, also Telegartner as a lower cost option, if they meet your spec.

Radiall have moved the production of a lot of their N connectors to China. I have measured some samples of these and they are within spec.

Cinch have introduced some low spec. ranges, check spec. carefully.

Likewise Amphenol.

So, I think you now have to check spec. very carefully, and do n’t be surprised if a connector that meets the MIL spec. to 12 GHz or 18 GHz is quite pricey.

So far as I know, there is no longer any manufacture of N connectors in the UK.

Regards,

Alwyn G8DOH


_____________________________________________________

Alwyn Seeds, Director
SynOptika Ltd.,
114 Beaufort Street,
London,
SW3 6BU,
England.


SynOptika Ltd., Registered in England and Wales: No. 04606737
Registered Office: 114 Beaufort Street, London, SW3 6BU, United Kingdom.
_____________________________________________________


Re: LA2T9Q ''6GHz' amplifier spec?

geoffrey pike
 

Almost certainly it will be not very good at 10 GHz but how many mWs are you thinking of needing at 10 GHz?
Have you looked at the Franco SU-02 board
cheers
Geoff
GI0GDP

On Wednesday, 9 June 2021, 07:52:27 BST, Gareth G4XAT via groups.io <g4xat@...> wrote:


This device is inside some cheap ALiExpress amp boards (under a tin can screen LA2T9Q). Unable to find any spec on it but wondering if it has ANY gain left at 10GHz. Very hopeful I know, but trying to raise a mW for the weekend from a Pluto 5th harmonic.
They certainly work to some degree on 5.7GHz where I got improved signals by using one in the RX chain, but other than looking at the received signal via a LNB and SDR I have no means at present of measuring any 'gain'.
The boards are typical eBay 'DC to Daylight' SMA in/out with 5vdc in, so it may be possible to swap in something of known capability at 10GHz.
Suggestions very welcome.

Gareth


LA2T9Q ''6GHz' amplifier spec?

Gareth G4XAT
 

This device is inside some cheap ALiExpress amp boards (under a tin can screen LA2T9Q). Unable to find any spec on it but wondering if it has ANY gain left at 10GHz. Very hopeful I know, but trying to raise a mW for the weekend from a Pluto 5th harmonic.
They certainly work to some degree on 5.7GHz where I got improved signals by using one in the RX chain, but other than looking at the received signal via a LNB and SDR I have no means at present of measuring any 'gain'.
The boards are typical eBay 'DC to Daylight' SMA in/out with 5vdc in, so it may be possible to swap in something of known capability at 10GHz.
Suggestions very welcome.

Gareth


Re: N plug solder for semi rigid

 

On Tue, 8 Jun 2021 at 20:56, Paul G8KFW <paul@...> wrote:

Hi Ben

From my experience Fc lane specialise in mule pin not coax and have a minimum order cost

 Regards Paul

They are an (probably only) UK distributor for Huber & Suhner who make RF connectors. I know H&S connectors are not cheap - and in my opinion are over-rated. But when I want hermetically sealed N sockets, F C Lane could supply them from H&S. 

They may have a minimum order. Carriage  is  is about £6 too. 
--
Dr. David Kirkby,
Kirkby Microwave Ltd,
drkirkby@...
https://www.kirkbymicrowave.co.uk/
Telephone 01621-680100./ +44 1621 680100

Registered in England & Wales, company number 08914892.
Registered office:
Stokes Hall Lodge, Burnham Rd, Althorne, Chelmsford, Essex, CM3 6DT, United Kingdom


Re: N plug solder for semi rigid

Paul G8KFW
 

Hi Stephan  

 

I should have included Farnell, Mouser, Digikey  who I have hade very good dealings with

And Farnell for over 45 years   M0MAT is new to me and possibly others  can you please highlight there rang / key items  ?

 

Ben you can try RS as they used to be good on RF connectors  ONLY go for the brass or stainless steal body  and steer away from any think chrome plated

In the old days the ones branded RS where good connectors  but sadly times change 

 

Paul

 

From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of Stephen Tompsett
Sent: 08 June 2021 18:18
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] N plug solder for semi rigid

 

Try: M0MAT, Farnell, Mouser, Digikey...

73s

Stephen (G8LYB)

On 08/06/2021 14:54, Dr. David Kirkby, Kirkby Microwave Ltd wrote:

On Mon, 11 Jan 2021 at 21:20, militaryoperator via groups.io <Military1944=aol.com@groups.io> wrote:


Looking on ebay, can't find a UK supplier of N plug for semi-rigid, soldered. 

 

They all seem Chinese or Crimp.

 

Where to go?

 

Ben

 

Try F.C. Lane (aka Lane Electronics). 

 

01403 790661

 

They are distributors for a wide range of connectors.  They are much cheaper than resellers. 

 

Dave. 

--

Dr. David Kirkby,
Kirkby Microwave Ltd,
drkirkby@...
https://www.kirkbymicrowave.co.uk/
Telephone 01621-680100./ +44 1621 680100

Registered in England & Wales, company number 08914892.
Registered office:
Stokes Hall Lodge, Burnham Rd, Althorne, Chelmsford, Essex, CM3 6DT, United Kingdom

-- 
Stephen Tompsett


--
Paul Bicknell G8KFW   South Coast UK


Re: 10GHz SMA to WG16

John E. Beech
 

I could imagine a scenario where two Gunn diodes give more power than the sum - one could be acting as an
oscillator and the second as an amplifier with perhaps a slightly different bias on it giving a combined output of more
than two oscillators.

de John G8SEQ

-------Original Message-------
From: Dr. David Kirkby, Kirkby Microwave Ltd <drkirkby@kirkbymicrowave.co.uk>
To: UKMicrowaves@groups.io <UKMicrowaves@groups.io>
Subject: Re: [UKMicrowaves] 10GHz SMA to WG16
Sent: Jun 08 '21 20:37

On Tue, 8 Jun 2021 at 14:43, Gareth G4XAT via groups.io
<g4xat=ntlworld.com@groups.io> wrote:

> I'm hoping to build a SMA to WG16 launcher/feeder by adapting an old
> Gunn diode radar housing. I have read the article in August 07
> Radcom which has dimensions ect, and I have some brass WG16 and an
> end-stop along with suitable SMA long-pin to be the probe. I'm
> wondering of my two options which is best. i.e. adapt the Gunn diode
> housing to SMA probe feed or fit a SMA to the bare brass WG16 which
> would then need a flange making/fitting for horn mount. Both will
> also bolt up to a conical WG16 to 22mm copper dish feed that I
> bought about 20 years ago from Bob Platts. I have a new BSB small
> dish that it can fir directly to.
> I'd assume that the Gunn diode is in the 'right place' already in
> the WG16 housing. It also has a tuning screw and a detector diode
> (might this be useful for measuring my own power - only mW at the
> moment from a Pluto SDR). I have another Gunn cavity with a good
> size horn , tuning screw and an 'aperture' (not sure what it does).
> Photos supplement the above....
> So which to build or modify?
> Guidance and suggestions very welcome...
> Thanks
> Gareth

I would expect the Gunn diode to have a major effect on the cavity, so
its removal, and replacement by an SMA connector, is in my opinion
unlikely to be optimal. That said, if you have a tuning screw, it may
be possible to compensate.

I recall reading an article in an amateur radio publication about
someone combining the output of two Gunn diodes and getting more power
than the sum of the two individual diodes. I recall discussing this
with a couple of people at a meeting held at Keysight. One of the
people was an academic building THz Gunn diodes. His thoughts were it
was utter crap - totally impossible. Perpetual motion. Another person
I spoke to about this was someone from Virginia diodes, who did make
THz extenders for Keysight VNAs. He was not surprised by this at all
and said that by combining the output of two diodes you have
COMPLETELY changed the cavity they are working in. So therefore if you
completely change the cavity, you would expect things to behave very
differently. It's his comments that make me feel that removing Gunn
diodes and detectors, and expecting an SMA connector to work in the
same position, is just hoping for too much. You might be lucky, but
are more likely to be unlucky.

I would not think trying to measure your own power in the cavity with
the detector diode is a good idea. I would couple some of the RF out
some distance from the transition.

I don't know what the RadCom article is like, but W1GHz done a lot of
work on optimisation of transitions using HFSS. That would be worth
looking at.

Dave

>


Re: N plug solder for semi rigid

Paul G8KFW
 

Hi Ben

 

I suggest you try Andrews as they are quite helpful to amateurs

 

From my experience Fc lane specialise in mule pin not coax and have a minimum order cost

 

Regards Paul

 

 

From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of Dr. David Kirkby, Kirkby Microwave Ltd
Sent: 08 June 2021 14:55
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] N plug solder for semi rigid

 

On Mon, 11 Jan 2021 at 21:20, militaryoperator via groups.io <Military1944=aol.com@groups.io> wrote:


Looking on ebay, can't find a UK supplier of N plug for semi-rigid, soldered. 

 

They all seem Chinese or Crimp.

 

Where to go?

 

Ben

 

Try F.C. Lane (aka Lane Electronics). 

 

01403 790661

 

They are distributors for a wide range of connectors.  They are much cheaper than resellers. 

 

Dave. 

--

Dr. David Kirkby,
Kirkby Microwave Ltd,
drkirkby@...
https://www.kirkbymicrowave.co.uk/
Telephone 01621-680100./ +44 1621 680100

Registered in England & Wales, company number 08914892.
Registered office:
Stokes Hall Lodge, Burnham Rd, Althorne, Chelmsford, Essex, CM3 6DT, United Kingdom


--
Paul Bicknell G8KFW   South Coast UK


Re: 10GHz SMA to WG16

 

On Tue, 8 Jun 2021 at 14:43, Gareth G4XAT via groups.io <g4xat=ntlworld.com@groups.io> wrote:
I'm hoping to build a SMA to WG16 launcher/feeder by adapting an old Gunn diode radar housing. I have read the article in August 07 Radcom which has dimensions ect, and I have some brass WG16 and an end-stop along with suitable SMA long-pin to be the probe. I'm wondering of my two options which is best. i.e. adapt the Gunn diode housing to SMA probe feed or fit a SMA to the bare brass WG16 which would then need a flange making/fitting for horn mount. Both will also bolt up to a conical WG16 to 22mm copper dish feed that I bought about 20 years ago from Bob Platts. I have a new BSB small dish that it can fir directly to.
I'd assume that the Gunn diode is in the 'right place' already in the WG16 housing. It also has a tuning screw and a detector diode (might this be useful for measuring my own power - only mW at the moment from a Pluto SDR). I have another Gunn cavity with a good size horn , tuning screw and an 'aperture' (not sure what it does). Photos supplement the above....
So which to build or modify?
Guidance and suggestions very welcome...
Thanks
Gareth
I would expect the Gunn diode to have a major effect on the cavity, so its removal, and replacement by an SMA connector, is in my opinion unlikely to be optimal. That said, if you have a  tuning screw, it may be possible to compensate.

I recall reading an article in an amateur radio publication about someone combining the output of two Gunn diodes and getting more power than the sum of the two individual diodes. I recall discussing this with a couple of people at a meeting held at Keysight. One of the people was an academic building THz Gunn diodes. His thoughts were it was utter crap - totally impossible. Perpetual motion. Another person I spoke to about this was someone from Virginia diodes, who did make THz extenders for Keysight VNAs. He was not surprised by this at all and said that by combining the output of two diodes you have completely changed the cavity they are working in. So therefore if you completely change the cavity, you would expect things to behave very differently. It's his comments that make me feel that removing Gunn diodes and detectors, and expecting an SMA connector to work in the same position, is just hoping for too much. You might be lucky, but are more likely to be unlucky.

I would not think trying to measure your own power in the cavity with the detector diode is a good idea. I would couple some of the RF out some distance from the transition.

I don't know what the RadCom article is like, but W1GHz done a lot of work on optimisation of transitions using HFSS. That would be worth looking at.

Dave


Re: N plug solder for semi rigid

Stephen Tompsett
 

Try: M0MAT, Farnell, Mouser, Digikey...

73s

Stephen (G8LYB)

On 08/06/2021 14:54, Dr. David Kirkby, Kirkby Microwave Ltd wrote:
On Mon, 11 Jan 2021 at 21:20, militaryoperator via groups.io <Military1944=aol.com@groups.io> wrote:

Looking on ebay, can't find a UK supplier of N plug for semi-rigid, soldered. 

They all seem Chinese or Crimp.

Where to go?

Ben

Try F.C. Lane (aka Lane Electronics). 

01403 790661

They are distributors for a wide range of connectors.  They are much cheaper than resellers. 

Dave. 
--
Dr. David Kirkby,
Kirkby Microwave Ltd,
drkirkby@...
https://www.kirkbymicrowave.co.uk/
Telephone 01621-680100./ +44 1621 680100

Registered in England & Wales, company number 08914892.
Registered office:
Stokes Hall Lodge, Burnham Rd, Althorne, Chelmsford, Essex, CM3 6DT, United Kingdom
-- 
Stephen Tompsett


Re: N plug solder for semi rigid

Gareth G4XAT
 

If you are stuck I have some S/H ones from decent kit, cut short with snips :-( 
2.2mm or 3.5 mm hard-line stubs. Body looks like stainless steel.
Gareth


Re: N plug solder for semi rigid

Reg Woolley
 

Also try m0mat



Sent from my Galaxy


-------- Original message --------
From: "Dr. David Kirkby, Kirkby Microwave Ltd" <drkirkby@...>
Date: 08/06/2021 14:54 (GMT+00:00)
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] N plug solder for semi rigid

On Mon, 11 Jan 2021 at 21:20, militaryoperator via groups.io <Military1944=aol.com@groups.io> wrote:

Looking on ebay, can't find a UK supplier of N plug for semi-rigid, soldered. 

They all seem Chinese or Crimp.

Where to go?

Ben

Try F.C. Lane (aka Lane Electronics). 

01403 790661

They are distributors for a wide range of connectors.  They are much cheaper than resellers. 

Dave. 
--
Dr. David Kirkby,
Kirkby Microwave Ltd,
drkirkby@...
https://www.kirkbymicrowave.co.uk/
Telephone 01621-680100./ +44 1621 680100

Registered in England & Wales, company number 08914892.
Registered office:
Stokes Hall Lodge, Burnham Rd, Althorne, Chelmsford, Essex, CM3 6DT, United Kingdom


Re: N plug solder for semi rigid

 

On Mon, 11 Jan 2021 at 21:20, militaryoperator via groups.io <Military1944=aol.com@groups.io> wrote:

Looking on ebay, can't find a UK supplier of N plug for semi-rigid, soldered. 

They all seem Chinese or Crimp.

Where to go?

Ben

Try F.C. Lane (aka Lane Electronics). 

01403 790661

They are distributors for a wide range of connectors.  They are much cheaper than resellers. 

Dave. 
--
Dr. David Kirkby,
Kirkby Microwave Ltd,
drkirkby@...
https://www.kirkbymicrowave.co.uk/
Telephone 01621-680100./ +44 1621 680100

Registered in England & Wales, company number 08914892.
Registered office:
Stokes Hall Lodge, Burnham Rd, Althorne, Chelmsford, Essex, CM3 6DT, United Kingdom


10GHz SMA to WG16

Gareth G4XAT
 

I'm hoping to build a SMA to WG16 launcher/feeder by adapting an old Gunn diode radar housing. I have read the article in August 07 Radcom which has dimensions ect, and I have some brass WG16 and an end-stop along with suitable SMA long-pin to be the probe. I'm wondering of my two options which is best. i.e. adapt the Gunn diode housing to SMA probe feed or fit a SMA to the bare brass WG16 which would then need a flange making/fitting for horn mount. Both will also bolt up to a conical WG16 to 22mm copper dish feed that I bought about 20 years ago from Bob Platts. I have a new BSB small dish that it can fir directly to.
I'd assume that the Gunn diode is in the 'right place' already in the WG16 housing. It also has a tuning screw and a detector diode (might this be useful for measuring my own power - only mW at the moment from a Pluto SDR). I have another Gunn cavity with a good size horn , tuning screw and an 'aperture' (not sure what it does). Photos supplement the above....
So which to build or modify?
Guidance and suggestions very welcome...
Thanks
Gareth


Re: A quick lashup 2.3 to 3.4 GHz horn

Alan Beard
 

Hi Kent and all,

On looking at the table in my previous email, I've rebuilt the feed.
The waveguide here is 100 x 50mm OD or 47 x 97mm ID.
So I went for a 20mm wide ridge (start) and because I can't fold a curve,
I elected to widen the ridge as we move away from the feed point.

2300.1  and 3398.1 MHz are my targets.

RF measurement with the NanoVNA V2_2 SAAV2 is very difficult without
good adapters and a good low return-loss terminator in BNC. 

(So many of the BNC terminators here are from "Thin-Net" 10Mbits)

I find BNC hardware so practical.

Anyway, the horn is ready for service.

Alan VK2ZIW

On Sun, 6 Jun 2021 13:53:32 +0000 (UTC), KENT BRITAIN wrote
> Hi Alan
>
> Most of these horns are used on my antenna range and have Network Analyzer S11 and Gain tables laminated on them.   Yes, they work nicely in 50 Ohm systems.
>
> Traditionally on an exponentiation Slot or Vivaldi antenna the feed point was 1/4 wave in front of a short.
> Later is was learned that replacing the 1/4 wave slot with a circle greatly broadened the frequency response of the antenna.      As for the ridges themselves.   The size of the opening determines the lowest frequency they will work at. How close you can position the slots determines the highest frequency.   Basically it's the structure behind the feedpoint that is helping to set the impedance.
>
> Kent
>
> PS  I like to think to the Vivaldi antennas as a ridged horn without the horn! hihi
>
> On Sunday, June 6, 2021, 04:32:47 AM CDT, Alan Beard <beardal@...> wrote:
>
> Thanks Kent,
>



---------------------------------------------------
Alan VK2ZIW
Before the Big Bang, God, Sela.
OpenWebMail 2.53, nothing in the cloud.


Re: ON0EME 23 cms EME beacon

G4LDR
 

Hello Keith,

There have been postings on 'moon-net' recently. ON0EME is off the air (has been for a while now). The azimth/elevation drive has suffered a major failure which may require a crane to lift the whole dish off the drive system. They are currently looking to see if it might be possible to do the repair with the dish in place as it is difficult to get a crane onto the site.

73 Neil G4LDR.


Re: ON0EME 23 cms EME beacon

John Fell
 

A report in latest EME Newsletter Keith , but basically it is not QRV due to a mechanical issue in the drive .

73
John
G0API

On Mon, 7 Jun 2021 at 14:07, Keith <Keith@...> wrote:
Hello all,
Can anyone advise if the ON0EME 23 cms EME beacon is operational please ?
I've tried the .be website but cannot get access to find out.
Searches on mr Google have drawn a blank, or broken links so far.
Thanks
Keith VK6KB / VK6EME


ON0EME 23 cms EME beacon

Keith
 

Hello all,
Can anyone advise if the ON0EME 23 cms EME beacon is operational please ?
I've tried the .be website but cannot get access to find out.
Searches on mr Google have drawn a blank, or broken links so far.
Thanks
Keith VK6KB / VK6EME

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