Date   

Re: 2320 PA Modifications?

Clint Sharp
 

As these boards have 'sense' FETs would that suggest they're using an automatic biasing scheme like the one shown in Ampleon's Doherty Amplifier App notes?

Should make it more simple to modify the biasing no?

On Thu, 22 Oct 2020 at 13:23, Robin Szemeti - G1YFG <robin@...> wrote:
The "other" type of board as per P27 of the PDF is easier to remove the circulator, 4 bolts.   I took a piece of brass bar, 10mm square, drilled a 0.141" hole through it at just the right height and soldered a piece it UT141 hardline through it with the centre conductor at board height.  Bolted down, it removes any possible strain on the junction.


On Thu, 22 Oct 2020 at 12:02, Richard White <gi4doh@...> wrote:
Not the neatest of modifications but this worked for me - if I were doing it again I would probably just wire round the circulator- I removed in in slices with a Dremel. But perfectly functional.
Other mods got a bit more oomph out of it.
73 Richard GI4DOH


--
Robin Szemeti - G1YFG



--
Clint. M0UAW IO83

No trees were harmed in the sending of this mail. However, a large number of electrons were greatly inconvenienced.


Re: 2320 PA Modifications?

Robin Szemeti - G1YFG
 

The "other" type of board as per P27 of the PDF is easier to remove the circulator, 4 bolts.   I took a piece of brass bar, 10mm square, drilled a 0.141" hole through it at just the right height and soldered a piece it UT141 hardline through it with the centre conductor at board height.  Bolted down, it removes any possible strain on the junction.


On Thu, 22 Oct 2020 at 12:02, Richard White <gi4doh@...> wrote:
Not the neatest of modifications but this worked for me - if I were doing it again I would probably just wire round the circulator- I removed in in slices with a Dremel. But perfectly functional.
Other mods got a bit more oomph out of it.
73 Richard GI4DOH


--
Robin Szemeti - G1YFG


Re: 2320 PA Modifications?

Anthony Coldman
 

Many thanks for the replies, I have now powered it up and getting rf out.  7mw in 18w out at 2320, but at 2220 its 60w for same drive.  I guess its need a little more modification and drive?  I see from varies pictures that adding copper section to some tracks has been done, fettling I believe, Is there any information available on this? 

 

Has anyone modified it so that it doesn’t draw 2amps all the time, I noticed that the heatsink starts to get rather warm after its been on for a while and even producing any O/P.

 

Robin- Thanks for the document, spent some time translating important area, shame it doesn’t give more details on the mods.

 

Richard, Thanks for the pictures, could you please email me the originals so I can zoom in and have a proper look at what you done. And also can you please confirm your drive level and resulting O/P at 2320?

 

Ben – thanks for contact and let’s keep in touch as we travel the modification road together  😊

 

Any other help/information appreciated, there seems to be a few trying this and some already done it.

 

Regards Anthony

 

From: UKMicrowaves@groups.io <UKMicrowaves@groups.io> On Behalf Of Richard White
Sent: 22 October 2020 12:02
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] 2320 PA Modifications?

 

Not the neatest of modifications but this worked for me - if I were doing it again I would probably just wire round the circulator- I removed in in slices with a Dremel. But perfectly functional.

Other mods got a bit more oomph out of it.

73 Richard GI4DOH


Re: Stainless steel N connector.

Mark GM4ISM
 

Mike

Stainless steel onto Aluminium is probably worse!

Any dissimilar metals will exhibit electrolytic corrosion over time.

One solution is to coat the mating surfaces in a corrosion inhibiting  compound. Bicon X1 is excellent, as is Unial, however the latter fell out of favour with my company as it is slightly more hazardous. You should not eat either!  Read the COSHH sheets!

These pastes really work very well (like thermal paste you don't want too much) and significantly extend the working life of components

Mark GM4ISM

On 22/10/2020 12:48, Michael Scott via groups.io wrote:
Hi All

I am looking for a four hole mounting female N connector in stainless steel ( if such a thing exists ) to replace the one on a helix feed to my QO-100 uplink antenna. After a year, the silver plated brass connector is heavily corroded where it is mounted on the aluminium reflector plate. It was originally built for Oscar 40 and wasn't intended for permanent outdoor mounting.

The alternative is to replace the aluminium plate with stainless steel and reuse the brass connector.

If anyone can help it would be appreciated!

73, Mike, G3LYP.




--
This email has been checked for viruses by AVG.
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Stainless steel N connector.

Michael Scott
 

Hi All

I am looking for a four hole mounting female N connector in stainless steel ( if such a thing exists ) to replace the one on a helix feed to my QO-100 uplink antenna. After a year, the silver plated brass connector is heavily corroded where it is mounted on the aluminium reflector plate. It was originally built for Oscar 40 and wasn't intended for permanent outdoor mounting.

The alternative is to replace the aluminium plate with stainless steel and reuse the brass connector.

If anyone can help it would be appreciated!

73, Mike, G3LYP.


Re: 2320 PA Modifications?

Richard White
 

Not the neatest of modifications but this worked for me - if I were doing it again I would probably just wire round the circulator- I removed in in slices with a Dremel. But perfectly functional.
Other mods got a bit more oomph out of it.
73 Richard GI4DOH


Re: 3cm and 6cm dualband feed.

Alan Beard
 

 Hi John,


 
> Can you make a tapered slot SWA array? intechopen.com

If I could see the pixtures (images rendered by X) there's a possibility.

Using Chrome on Linux, all the images are hijacked by BanGood.

Using Firefox, no images are displayed though in both cases I've accepted intechopen's cookie.

Trying the "download chapter", on entering name and email and Captcha I get Bad Gateway.

So, can you provide a picture?

Alan VK2ZIW 


On Mon, 19 Oct 2020 11:01:40 -0400, john pieniadz wrote
> Alan:  I agree with your big bang fact, God ,Selah "think on this thing" You say nothing in the cloud!  I know you are talking about internet. But He will be returning in the clouds..
>  73 john AK4MW
>
> Can you make a tapered slot SWA array? intechopen.com
>
> On Mon, Oct 19, 2020 at 1:02 AM Alan Beard <beardal@...> wrote:
>

> Hi guys,
>
>

> Well, I built it, double size to get to 1.3 GHz where I want it.
>
>

> The feed balun is just a short piece of 50 ohm coax in a box underneath
> going to a BNC socket.
>
>

> Analysis with a PocketVNA.
>
>

> Any comments?
>
>

> Alan VK2ZIW
>
>

> Yes it radiates but the Return Loss is horrible.
>
>

> On Sun, 11 Oct 2020 06:44:47 +1000, Alan Beard 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.
> >
> >
>
> ---------------------------------------------------
> Alan VK2ZIW
> Before the Big Bang, God, Sela.
> OpenWebMail 2.53, nothing in the cloud.
>
>
>
>


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


Re: 2320 PA Modifications?

militaryoperator
 

Looking for information on modifications for this pallet to use on 13cm?
Any help/information gratefully received
Anthony G7LRQ
-------------------

About to start on mine as well Anthony. Nice to work you on Tuesday. 

Ben G4BXD

 


Re: 2320 PA Modifications?

geoffrey pike
 

But perhaps they are adding parallel inductance
Geoff
GI0GDP

On Thursday, 22 October 2020, 00:45:52 BST, Robin Szemeti - G1YFG <robin@...> wrote:


This may help

I would ignore the pictures showing added capacitors ... anyone adding capacitors with those length leads at 2320 is having a laugh.  There are 2 types of this slab, one on page one, the type I have is shown on page 27.  The type on P27 draws about 1.9A  idle.

On Thu, 22 Oct 2020 at 00:35, Robin Szemeti <robin@...> wrote:
I have a very similar one,  basically, not a lot is needed.

I removed the circulator, replaced the input connector with an SMA, coupled to the output to some hardline and that was about it. No real "tuning" seemed to be needed, it swept OK  and showed decent gain at 2320.  

Just put 0V on the "outer" sets of pins and 28V on the inner sets of pins.   If you look carefully you can see that on each side there are 4 pins connected to the main device and one to a "driver stage" ... I would check the current draw on the 4 left main device, right main device,  drier stage and input stage and record the values for future reference.

On Thu, 22 Oct 2020 at 00:28, Anthony Coldman via groups.io <anthony.coldman=ntlworld.com@groups.io> wrote:

Looking for information on modifications for this pallet to use on 13cm?

 

Any help/information gratefully received

 

Anthony G7LRQ

 


--
Robin Szemeti - G1YFG


Re: New to me ...

Robin Szemeti - G1YFG
 

The marconi head came with a lead, so I hope I am good for that.   I'll look for some combi cable with at least two screened cores to make up the HP lead.  I always knew thos connectors as "tuschel DIN" ... they were used on the ancient "storno 500" handhelds ...

I use farnell a lot, great company, my "go to" supplier for anything really.


On Thu, 22 Oct 2020 at 02:35, Paul G8KFW <paul@...> wrote:

Regarding 6960B not recognising the sensor there is often a socket for the sensor on the back of the unit and this could be the one in use

just open it up and you can easily change it so the front socket is useable

 

Re leads

 

The Marconi use a special cable  but it appears that providing you use short lengths (1.5 Mt )   you can use nearly any think but better results ( less noise when using the low range )

are by using the lay of the cable so you don’t have input and driver signals next to each other

 

Never made up a HP cable  but again just keep the length short

The best plugs are made by Binder and sold by Farnell ( lovely company to deal with ) they have 3 versions and did cost between £10 and £15 each  

Marconi started with the cheep version then went to the expensive version as they have a better cable grip

 

Regards Paul


From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of Robin Szemeti - G1YFG
Sent: 22 October 2020 01:56
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] New to me ...

 

Yep, 6960B, picked one up on eBay for £40,  apparently does  not recognise heads .. but its all fairly simple discrete logic etc, and he confirmed it did power up and run,  most likely a broken wire, they use different voltage zeners to select head type. 

 

Thanks for the tip re HP leads/heads. I was going to just make up a lead fro the HP from plugs from Farnell.

 

 

On Thu, 22 Oct 2020 at 00:47, Paul G8KFW <paul@...> wrote:

 

Hi Robin

 

Regarding the "slightly dysfunctional" meter

If you are talking about a Marconi  6960 B   then watch out for the IEC socket as it is also a mains filter  and  they have a tendency to go bang 

I hade 3 Marconi  6960 B   on soak test  a few  years ago and within 48 hours 2 of the 3 blow their IEC mans filters replaced the IEC mans filters and all was OK

and don’t forget the Marconi lead is not compatible with the HP power meter

 

Re a 26 Ghz analyzer these tend to be expensive  suggest you look at a 18  or 22 Ghz analyser  but go for one with a preselector and external mixer facility

Then you can use an external mixer for 24 Ghz

 

A good combination is the HP 8569  and a HP 11970  wave guide mixer  either  the  18 – 26 Ghz  or the   26-40 Ghz   will be OK for 24 Ghz  as it is good to below 22 Ghz

A less expensive option is the HP8565  and this can use any single point external mixer as the dyplexer is inside the analyser

 

Feale free to PM me for more information on HP test equipment  

 

Paul


From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of Robin Szemeti - G1YFG
Sent: 21 October 2020 22:39
To: UKMicrowaves@groups.io
Subject: [UKMicrowaves] New to me ...

 

Finally picked up a nice power sensor and have a "slightly dysfunctional" meter for it coming, hopefully the meter is an easy fix.  This should address my power measurement guesstimates at least! 

 

I also managed to get a "not quite accurate, but calibrated against a good standard"  diode head for the HP meter.   It's off by about 3dB, but the seller was a t&m collector and had access to some good standards to calibrate against, so while it is "out" at least I know how much it is "out" by!

 

I also picked up a nice Marconi/IFR 100khz to 20GHz sweeper/sig gen a while ago that addresses another missing piece of the puzzle ... just need a decent 26g analyzer now to add to the 1.8G HP and I think my thirst for measurement gear will be (temporarily) abated!


Best regards,
Robin Szemeti

Redpoint Consulting Limited 

E: robin@... 

T: +44 (0) 1299 405028 

M: +44 (0) 7971 883371 

Thank you. 

Robin Szemeti - G1YFG

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


Robin Szemeti - G1YFG

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


--
Robin Szemeti - G1YFG


Re: New to me ...

Paul G8KFW
 

Regarding 6960B not recognising the sensor there is often a socket for the sensor on the back of the unit and this could be the one in use

just open it up and you can easily change it so the front socket is useable

 

Re leads

 

The Marconi use a special cable  but it appears that providing you use short lengths (1.5 Mt )   you can use nearly any think but better results ( less noise when using the low range )

are by using the lay of the cable so you don’t have input and driver signals next to each other

 

Never made up a HP cable  but again just keep the length short

The best plugs are made by Binder and sold by Farnell ( lovely company to deal with ) they have 3 versions and did cost between £10 and £15 each  

Marconi started with the cheep version then went to the expensive version as they have a better cable grip

 

Regards Paul


From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of Robin Szemeti - G1YFG
Sent: 22 October 2020 01:56
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] New to me ...

 

Yep, 6960B, picked one up on eBay for £40,  apparently does  not recognise heads .. but its all fairly simple discrete logic etc, and he confirmed it did power up and run,  most likely a broken wire, they use different voltage zeners to select head type. 

 

Thanks for the tip re HP leads/heads. I was going to just make up a lead fro the HP from plugs from Farnell.

 

 

On Thu, 22 Oct 2020 at 00:47, Paul G8KFW <paul@...> wrote:

 

Hi Robin

 

Regarding the "slightly dysfunctional" meter

If you are talking about a Marconi  6960 B   then watch out for the IEC socket as it is also a mains filter  and  they have a tendency to go bang 

I hade 3 Marconi  6960 B   on soak test  a few  years ago and within 48 hours 2 of the 3 blow their IEC mans filters replaced the IEC mans filters and all was OK

and don’t forget the Marconi lead is not compatible with the HP power meter

 

Re a 26 Ghz analyzer these tend to be expensive  suggest you look at a 18  or 22 Ghz analyser  but go for one with a preselector and external mixer facility

Then you can use an external mixer for 24 Ghz

 

A good combination is the HP 8569  and a HP 11970  wave guide mixer  either  the  18 – 26 Ghz  or the   26-40 Ghz   will be OK for 24 Ghz  as it is good to below 22 Ghz

A less expensive option is the HP8565  and this can use any single point external mixer as the dyplexer is inside the analyser

 

Feale free to PM me for more information on HP test equipment  

 

Paul


From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of Robin Szemeti - G1YFG
Sent: 21 October 2020 22:39
To: UKMicrowaves@groups.io
Subject: [UKMicrowaves] New to me ...

 

Finally picked up a nice power sensor and have a "slightly dysfunctional" meter for it coming, hopefully the meter is an easy fix.  This should address my power measurement guesstimates at least! 

 

I also managed to get a "not quite accurate, but calibrated against a good standard"  diode head for the HP meter.   It's off by about 3dB, but the seller was a t&m collector and had access to some good standards to calibrate against, so while it is "out" at least I know how much it is "out" by!

 

I also picked up a nice Marconi/IFR 100khz to 20GHz sweeper/sig gen a while ago that addresses another missing piece of the puzzle ... just need a decent 26g analyzer now to add to the 1.8G HP and I think my thirst for measurement gear will be (temporarily) abated!


Best regards,
Robin Szemeti

Redpoint Consulting Limited 

E: robin@... 

T: +44 (0) 1299 405028 

M: +44 (0) 7971 883371 

Thank you. 

Robin Szemeti - G1YFG

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


Robin Szemeti - G1YFG

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: New to me ...

Robin Szemeti - G1YFG
 

Yep, 6960B, picked one up on eBay for £40,  apparently does  not recognise heads .. but its all fairly simple discrete logic etc, and he confirmed it did power up and run,  most likely a broken wire, they use different voltage zeners to select head type. 

Thanks for the tip re HP leads/heads. I was going to just make up a lead fro the HP from plugs from Farnell.



On Thu, 22 Oct 2020 at 00:47, Paul G8KFW <paul@...> wrote:

Hi Robin

 

Regarding the "slightly dysfunctional" meter

If you are talking about a Marconi  6960 B   then watch out for the IEC socket as it is also a mains filter  and  they have a tendency to go bang 

I hade 3 Marconi  6960 B   on soak test  a few  years ago and within 48 hours 2 of the 3 blow their IEC mans filters replaced the IEC mans filters and all was OK

and don’t forget the Marconi lead is not compatible with the HP power meter

 

Re a 26 Ghz analyzer these tend to be expensive  suggest you look at a 18  or 22 Ghz analyser  but go for one with a preselector and external mixer facility

Then you can use an external mixer for 24 Ghz

 

A good combination is the HP 8569  and a HP 11970  wave guide mixer  either  the  18 – 26 Ghz  or the   26-40 Ghz   will be OK for 24 Ghz  as it is good to below 22 Ghz

A less expensive option is the HP8565  and this can use any single point external mixer as the dyplexer is inside the analyser

 

Feale free to PM me for more information on HP test equipment  

 

Paul


From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of Robin Szemeti - G1YFG
Sent: 21 October 2020 22:39
To: UKMicrowaves@groups.io
Subject: [UKMicrowaves] New to me ...

 

Finally picked up a nice power sensor and have a "slightly dysfunctional" meter for it coming, hopefully the meter is an easy fix.  This should address my power measurement guesstimates at least! 

 

I also managed to get a "not quite accurate, but calibrated against a good standard"  diode head for the HP meter.   It's off by about 3dB, but the seller was a t&m collector and had access to some good standards to calibrate against, so while it is "out" at least I know how much it is "out" by!

 

I also picked up a nice Marconi/IFR 100khz to 20GHz sweeper/sig gen a while ago that addresses another missing piece of the puzzle ... just need a decent 26g analyzer now to add to the 1.8G HP and I think my thirst for measurement gear will be (temporarily) abated!

 

image.png


--

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.


--
Robin Szemeti - G1YFG

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


--
Robin Szemeti - G1YFG


Re: New to me ...

Paul G8KFW
 

Hi Robin

 

Regarding the "slightly dysfunctional" meter

If you are talking about a Marconi  6960 B   then watch out for the IEC socket as it is also a mains filter  and  they have a tendency to go bang 

I hade 3 Marconi  6960 B   on soak test  a few  years ago and within 48 hours 2 of the 3 blow their IEC mans filters replaced the IEC mans filters and all was OK

and don’t forget the Marconi lead is not compatible with the HP power meter

 

Re a 26 Ghz analyzer these tend to be expensive  suggest you look at a 18  or 22 Ghz analyser  but go for one with a preselector and external mixer facility

Then you can use an external mixer for 24 Ghz

 

A good combination is the HP 8569  and a HP 11970  wave guide mixer  either  the  18 – 26 Ghz  or the   26-40 Ghz   will be OK for 24 Ghz  as it is good to below 22 Ghz

A less expensive option is the HP8565  and this can use any single point external mixer as the dyplexer is inside the analyser

 

Feale free to PM me for more information on HP test equipment  

 

Paul


From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of Robin Szemeti - G1YFG
Sent: 21 October 2020 22:39
To: UKMicrowaves@groups.io
Subject: [UKMicrowaves] New to me ...

 

Finally picked up a nice power sensor and have a "slightly dysfunctional" meter for it coming, hopefully the meter is an easy fix.  This should address my power measurement guesstimates at least! 

 

I also managed to get a "not quite accurate, but calibrated against a good standard"  diode head for the HP meter.   It's off by about 3dB, but the seller was a t&m collector and had access to some good standards to calibrate against, so while it is "out" at least I know how much it is "out" by!

 

I also picked up a nice Marconi/IFR 100khz to 20GHz sweeper/sig gen a while ago that addresses another missing piece of the puzzle ... just need a decent 26g analyzer now to add to the 1.8G HP and I think my thirst for measurement gear will be (temporarily) abated!

 

image.png


--

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.


--
Robin Szemeti - G1YFG

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: 2320 PA Modifications?

Robin Szemeti - G1YFG
 

This may help

I would ignore the pictures showing added capacitors ... anyone adding capacitors with those length leads at 2320 is having a laugh.  There are 2 types of this slab, one on page one, the type I have is shown on page 27.  The type on P27 draws about 1.9A  idle.


On Thu, 22 Oct 2020 at 00:35, Robin Szemeti <robin@...> wrote:
I have a very similar one,  basically, not a lot is needed.

I removed the circulator, replaced the input connector with an SMA, coupled to the output to some hardline and that was about it. No real "tuning" seemed to be needed, it swept OK  and showed decent gain at 2320.  

Just put 0V on the "outer" sets of pins and 28V on the inner sets of pins.   If you look carefully you can see that on each side there are 4 pins connected to the main device and one to a "driver stage" ... I would check the current draw on the 4 left main device, right main device,  drier stage and input stage and record the values for future reference.

On Thu, 22 Oct 2020 at 00:28, Anthony Coldman via groups.io <anthony.coldman=ntlworld.com@groups.io> wrote:

Looking for information on modifications for this pallet to use on 13cm?

 

Any help/information gratefully received

 

Anthony G7LRQ

 


--
Robin Szemeti - G1YFG


Re: 2320 PA Modifications?

Robin Szemeti - G1YFG
 

I have a very similar one,  basically, not a lot is needed.

I removed the circulator, replaced the input connector with an SMA, coupled to the output to some hardline and that was about it. No real "tuning" seemed to be needed, it swept OK  and showed decent gain at 2320.  

Just put 0V on the "outer" sets of pins and 28V on the inner sets of pins.   If you look carefully you can see that on each side there are 4 pins connected to the main device and one to a "driver stage" ... I would check the current draw on the 4 left main device, right main device,  drier stage and input stage and record the values for future reference.

On Thu, 22 Oct 2020 at 00:28, Anthony Coldman via groups.io <anthony.coldman=ntlworld.com@groups.io> wrote:

Looking for information on modifications for this pallet to use on 13cm?

 

Any help/information gratefully received

 

Anthony G7LRQ

 


--
Robin Szemeti - G1YFG


2320 PA Modifications?

Anthony Coldman
 

Looking for information on modifications for this pallet to use on 13cm?

 

Any help/information gratefully received

 

Anthony G7LRQ

 


Re: New to me ...

Clint Sharp
 

Hi, my name is Clint and I'm a Test Equipment Addict, I own two spectrum analysers, several power meters, heads, I've lost count of the number of scopes, multimeters, sig gens, sensors, adapters, analysers etc. etc. and I still cast covetous eyes on test equipment auctions, catalogues etc. 

Just give in to it, it makes life easier. 

On Wed, 21 Oct 2020, 22:39 Robin Szemeti - G1YFG, <robin@...> wrote:
Finally picked up a nice power sensor and have a "slightly dysfunctional" meter for it coming, hopefully the meter is an easy fix.  This should address my power measurement guesstimates at least! 

I also managed to get a "not quite accurate, but calibrated against a good standard"  diode head for the HP meter.   It's off by about 3dB, but the seller was a t&m collector and had access to some good standards to calibrate against, so while it is "out" at least I know how much it is "out" by!

I also picked up a nice Marconi/IFR 100khz to 20GHz sweeper/sig gen a while ago that addresses another missing piece of the puzzle ... just need a decent 26g analyzer now to add to the 1.8G HP and I think my thirst for measurement gear will be (temporarily) abated!

image.png


--
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.

--
Robin Szemeti - G1YFG


New to me ...

Robin Szemeti - G1YFG
 

Finally picked up a nice power sensor and have a "slightly dysfunctional" meter for it coming, hopefully the meter is an easy fix.  This should address my power measurement guesstimates at least! 

I also managed to get a "not quite accurate, but calibrated against a good standard"  diode head for the HP meter.   It's off by about 3dB, but the seller was a t&m collector and had access to some good standards to calibrate against, so while it is "out" at least I know how much it is "out" by!

I also picked up a nice Marconi/IFR 100khz to 20GHz sweeper/sig gen a while ago that addresses another missing piece of the puzzle ... just need a decent 26g analyzer now to add to the 1.8G HP and I think my thirst for measurement gear will be (temporarily) abated!

image.png


--
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.

--
Robin Szemeti - G1YFG


Re: Do I need any Heat Sink compound on these mating surfaces.

Nick Gregory G0HIK
 

Thanks for the confidence boost Robin

Nick G0HIK


Re: Do I need any Heat Sink compound on these mating surfaces.

Robin Szemeti - G1YFG
 

Those drive figures and output levels sound "about right" for 28V LDMOS at 2.3GHz ... LDMOS is very gainy compared to bipolar, My 23cm amp will produce 250W out for 2W of drive ... from a single 48V LDMOS device, so 70 out for 2.5 watts of drive at 2320/28V does not sound at all unreasonable.


On Wed, 21 Oct 2020 at 20:52, Nick Gregory G0HIK via groups.io <nickg0hik=googlemail.com@groups.io> wrote:
Hi Chris,

Thanks for the information.

I'm gradually building up test kit suitable for this type of work. I have thought about a Pluto, I'll put it on my Shopping / Christmas list 

I have varied the input to the amp and it windups smoothly, so there does not appear to be instability. I was not suspecting the design, more my construction. I had noted instability with transistors mounted with compound, I do not notice any now with it bolted direct to the heat spreader. But I still want to improve the contact as per Neils information.

Today my directional coupler arrived and I can measure the power more accurately.

1.25 watts in gives 50 watts out @ 4amps
2.5 watts in gives 70 watts out @ 6 amps

Nick G0HIK


--
Robin Szemeti - G1YFG