Date   

Andrew LDF1-50 connector

DF6NA Rainer
 

Happy New Year,

just found two large pieces of LDF1-50 in my garage.
I'm now looking for a few connectors.

Please reply direct.

vy 73, Rainer


Marconi power meter for disposal.

g3zqu
 

Hi all,
I have a working Marconi 6960 power meter for disposal. Comes complete with the connecting lead, 6920 sensor head and the 30dB attenuator, these 3 items are in the correct plastic storage box.
All working but not been calibrated for a long while!
Any interest contact me off the forum, callsign at btinternet dot com.
 
Martin G3ZQU


Re: EuMW 2020

John Worsnop
 

I've been asked to publicise this event amongst the amateur GHz community. Seems like there's some post-registration events that should be of interest.

See below 


On Sun, 3 Jan 2021, 11:51 Vliet, F.E. (Frank) van, <frank.vanvliet@...> wrote:

Hi, John,

 

As said, I am the General Chair of the European Microwave Week 2020, the largest professional Microwave & Radar event in Europe. Usually 5000-6000 visitors.

 

The event travels through Europe, and would have been held in Utrecht, The Netherlands in September 2020. It has been delayed to January 2020 hoping that we could leave the in-person nature intact, but Covid killed that. We have transformed the event from mid November onward into a virtual event and will run the event virtual between 10-15 January 2021.

 

Some handy links:

Registration: Register Now (eumweek.com)

Programme book (130+ pages): https://www.eumweek.com/docs/programme.pdf

Shortform programme (20+ pages): EuMW2020_Mini-Programme_10092020.pdf

Logo (use that if you like for posts): attached

Accounts that promote this on twitter: @eumweek ; @eumassociation

Accounts that promote this on LinkedIn: European Microwave Association , European Microwave Week

 

You can find the VERY extensive list of activities in a 130 page programme book. It is really incredible how much there is to do.

This programme book was for the in-person event, but will largely be identical for the on-line event. Update is ongoing.

 

Access to the conference for individuals is relatively pricy (200-1100 Euro depending on membership, age etc.), it is an event for professionals.

However, if you register yourself as VISITOR (as opposed to delegate), registration is free, and there are already a lot of fun things to do:

  • Exhibition with approximately 100 microwave companies
  • Opening- and Closing session for all three conferences (with 12 keynotes that are world-class, including one by NASA on microwave techniques in future NASA missions, one on microwave techniques in METOPS NG (a satellite system that will replace a large part of the weather prediction support)
  • Access to the Microwave Quizz and ChatRoulette
  • Access to all scientific posters, three cool Technology-in-Context lectures (space law, 5G, network threats), Rohde & Schwarz workshops

 

For example access to the Defence, Security and Space Forum costs 60 Euro, and will give a peak into future military activities and the Doctoral School of Microwaves (5G system design down to IC details) only 40 Euro.

 

Would be grateful if you could help spreading the word! (And given your interests, I would DEFINITELY join). It it the first and possibly only time that you can enter without travelling around Europe!

 

73

 

Frank.

 

 

This message may contain information that is not intended for you. If you are not the addressee or if this message was sent to you by mistake, you are requested to inform the sender and delete the message. TNO accepts no liability for the content of this e-mail, for the manner in which you use it and for damage of any kind resulting from the risks inherent to the electronic transmission of messages.


Re: RW1127 TWT and PSU information now collected on the UKuG Wiki

Neil Smith G4DBN
 

Oooo, the Owd Fowks are talkin bout Owd Fowks Music again. It's not exactly Sleaford Mods or Megan Thee Stallion, but has the benefit of fewer expletives requiring deletion when used as quotes.

Very interesting reading, thanks John.

Is there a secret stash of 1127s somewhere awaiting conversion, or are we destined to wait an age until/if solid state solutions QRO get affordable?

Neil G4DBN

(sitting staring at wsjtx source code cos still too poorly to be trusted with machine tools or electricity)

On 03/01/2021 16:10, John Fell wrote:
Suitably Numb ?

John
G0API

On Sun, 3 Jan 2021 at 15:19, ian hope (2E0IJH) <ian@...> wrote:
Shall we all meet on the Dark side of the Moon?
 
Ian
M5IJH
 
 
Sent: Sunday, January 03, 2021 at 2:30 PM
From: "Dominique Dehays" <f6dro@...>
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] RW1127 TWT and PSU information now collected on the UKuG Wiki
The lunatic is in my head
 
-------- Message d'origine --------
De : g4bao <john@...>
Date : 03/01/2021 12:59 (GMT+01:00)
Objet : [UKMicrowaves] RW1127 TWT and PSU information now collected on the UKuG Wiki
 
I've just updated the UKuG Wiki with all I have on the RW1127 Travelling Wave Tube and PSU including the STC TWT databooks.

https://wiki.microwavers.org.uk/24_GHz#Travelling_Wave_Tubes

Much of the information is from the DL7YC papers and is already in various places on the Web.

What is new, is that Brian, G4NNS has kindly allowed me to publish the extra information he has dug up from his paper archives for me and, (once I finish it!) I will publish details of my Arduino based controller and sequencer for the Tube and PSU there.

Be careful with that 6.3kV supply Eugene!!....AAAAAAHHHHHGGHHH!!!

(one for the Pink Floyd aficionados.....  :-)

73
John 
_.


Re: RW1127 TWT and PSU information now collected on the UKuG Wiki

John Fell
 
Edited

Suitably Numb ?

John
G0API

On Sun, 3 Jan 2021 at 15:19, ian hope (2E0IJH) <ian@...> wrote:
Shall we all meet on the Dark side of the Moon?
 
Ian
M5IJH
 
 
Sent: Sunday, January 03, 2021 at 2:30 PM
From: "Dominique Dehays" <f6dro@...>
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] RW1127 TWT and PSU information now collected on the UKuG Wiki
The lunatic is in my head
 
-------- Message d'origine --------
De : g4bao <john@...>
Date : 03/01/2021 12:59 (GMT+01:00)
Objet : [UKMicrowaves] RW1127 TWT and PSU information now collected on the UKuG Wiki
 
I've just updated the UKuG Wiki with all I have on the RW1127 Travelling Wave Tube and PSU including the STC TWT databooks.

https://wiki.microwavers.org.uk/24_GHz#Travelling_Wave_Tubes

Much of the information is from the DL7YC papers and is already in various places on the Web.

What is new, is that Brian, G4NNS has kindly allowed me to publish the extra information he has dug up from his paper archives for me and, (once I finish it!) I will publish details of my Arduino based controller and sequencer for the Tube and PSU there.

Be careful with that 6.3kV supply Eugene!!....AAAAAAHHHHHGGHHH!!!

(one for the Pink Floyd aficionados.....  :-)

73
John 


Re: RW1127 TWT and PSU information now collected on the UKuG Wiki

ian hope (2E0IJH)
 

Shall we all meet on the Dark side of the Moon?
 
Ian
M5IJH

 
 
Sent: Sunday, January 03, 2021 at 2:30 PM
From: "Dominique Dehays" <f6dro@...>
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] RW1127 TWT and PSU information now collected on the UKuG Wiki
The lunatic is in my head
 
-------- Message d'origine --------
De : g4bao <john@...>
Date : 03/01/2021 12:59 (GMT+01:00)
À : UKMicrowaves@groups.io
Objet : [UKMicrowaves] RW1127 TWT and PSU information now collected on the UKuG Wiki
 
I've just updated the UKuG Wiki with all I have on the RW1127 Travelling Wave Tube and PSU including the STC TWT databooks.

https://wiki.microwavers.org.uk/24_GHz#Travelling_Wave_Tubes

Much of the information is from the DL7YC papers and is already in various places on the Web.

What is new, is that Brian, G4NNS has kindly allowed me to publish the extra information he has dug up from his paper archives for me and, (once I finish it!) I will publish details of my Arduino based controller and sequencer for the Tube and PSU there.

Be careful with that 6.3kV supply Eugene!!....AAAAAAHHHHHGGHHH!!!

(one for the Pink Floyd aficionados.....  :-)

73
John 


Re: RW1127 TWT and PSU information now collected on the UKuG Wiki

Dominique Dehays
 

The lunatic is in my head

-------- Message d'origine --------
De : g4bao <john@...>
Date : 03/01/2021 12:59 (GMT+01:00)
À : UKMicrowaves@groups.io
Objet : [UKMicrowaves] RW1127 TWT and PSU information now collected on the UKuG Wiki

I've just updated the UKuG Wiki with all I have on the RW1127 Travelling Wave Tube and PSU including the STC TWT databooks.

https://wiki.microwavers.org.uk/24_GHz#Travelling_Wave_Tubes

Much of the information is from the DL7YC papers and is already in various places on the Web.

What is new, is that Brian, G4NNS has kindly allowed me to publish the extra information he has dug up from his paper archives for me and, (once I finish it!) I will publish details of my Arduino based controller and sequencer for the Tube and PSU there.

Be careful with that 6.3kV supply Eugene!!....AAAAAAHHHHHGGHHH!!!

(one for the Pink Floyd aficionados.....  :-)

73
John 


Re: Baying two wimo 44 ele yagis (1296 mhz)

Robin Szemeti - G1YFG
 

It is not a super critical measurement, I suspect it is centre to centre, and indeed opinion varies by quite some amount as to what the optimum is, there are different methods of working it out based on effective beam width, best G/T, minimum sidelobes etc  which result in quite different spacings, so I wouldn't worry too much about getting it exactly "right" as it is debatable what "right" actually is ... I've never been able to really detect a difference, even when moving them a fair amount.


On Sun, 3 Jan 2021 at 14:15, G0FVI via groups.io <Andrew.gilfillan=ntlworld.com@groups.io> wrote:
Quick baying question that someone will know the answer to! About to bay two 44 ele wimo yagis. The separation distance is given as 751mm, is this distance from the centre/edge of the booms or between the end of the elements?

thanks

Andy G0FVI


--
Robin Szemeti - G1YFG


Baying two wimo 44 ele yagis (1296 mhz)

G0FVI
 

Quick baying question that someone will know the answer to! About to bay two 44 ele wimo yagis. The separation distance is given as 751mm, is this distance from the centre/edge of the booms or between the end of the elements?

thanks

Andy G0FVI


RW1127 TWT and PSU information now collected on the UKuG Wiki

g4bao
 

I've just updated the UKuG Wiki with all I have on the RW1127 Travelling Wave Tube and PSU including the STC TWT databooks.

https://wiki.microwavers.org.uk/24_GHz#Travelling_Wave_Tubes

Much of the information is from the DL7YC papers and is already in various places on the Web.

What is new, is that Brian, G4NNS has kindly allowed me to publish the extra information he has dug up from his paper archives for me and, (once I finish it!) I will publish details of my Arduino based controller and sequencer for the Tube and PSU there.

Be careful with that 6.3kV supply Eugene!!....AAAAAAHHHHHGGHHH!!!

(one for the Pink Floyd aficionados.....  :-)

73
John 


Re: Chinese ADF4351 signal source

G0FCU
 

That's the one. So I need to remove R5 and L1 and thanks for the heads up about the charge pump resistor.

Many thanks
Simon.
G0FCU.


On Sun, 3 Jan 2021, 07:44 Robin Szemeti - G1YFG, <robin@...> wrote:
This one?

image.png


R5 is the signal from the onboard xtal
R8 is the signal from the SMA socket
L1 is the power to the onboard xtal

Check also the value of the charge pump resistor and make sure it matches the value set in the software you use to calculate the numbers ... I *think* it is R7 on that board, but please check.  It connects between pins 7 and 20.  Most of the software is set up to expect a value of 1K ... these boards often have 5.1K  in that position ...  if the numbers don't match the software, you'll run out of tuning range.

On Sun, 3 Jan 2021 at 07:14, G0FCU <simon@...> wrote:
Could someone tell me the components that need to be changed on the ADF4351 (black eBay) board to enable a 10 MHz reference input?

I can't find a circuit diagram on-line. Earlier in this thread Andy mentioned an inductor to be removed (L1?) and some other links to be changed.

Thanks
Simon
G0FCU (new to microwaves so bear with me!)


--
Robin Szemeti - G1YFG


Re: Chinese ADF4351 signal source

Robin Szemeti - G1YFG
 

This one?

image.png


R5 is the signal from the onboard xtal
R8 is the signal from the SMA socket
L1 is the power to the onboard xtal

Check also the value of the charge pump resistor and make sure it matches the value set in the software you use to calculate the numbers ... I *think* it is R7 on that board, but please check.  It connects between pins 7 and 20.  Most of the software is set up to expect a value of 1K ... these boards often have 5.1K  in that position ...  if the numbers don't match the software, you'll run out of tuning range.


On Sun, 3 Jan 2021 at 07:14, G0FCU <simon@...> wrote:
Could someone tell me the components that need to be changed on the ADF4351 (black eBay) board to enable a 10 MHz reference input?

I can't find a circuit diagram on-line. Earlier in this thread Andy mentioned an inductor to be removed (L1?) and some other links to be changed.

Thanks
Simon
G0FCU (new to microwaves so bear with me!)


--
Robin Szemeti - G1YFG


Re: Chinese ADF4351 signal source

G0FCU
 

Could someone tell me the components that need to be changed on the ADF4351 (black eBay) board to enable a 10 MHz reference input?

I can't find a circuit diagram on-line. Earlier in this thread Andy mentioned an inductor to be removed (L1?) and some other links to be changed.

Thanks
Simon
G0FCU (new to microwaves so bear with me!)


Re: Unknown signal on 1296.030 ish

Mark - M1MPW
 

A bit more investigation and the 432 signal has 1/3rd the frequency shift of the 1296 signal.
My 1296 signal is louder but that is very likely because my 432 setup is quite lossy and the antenna has less gain.
Signal was there for an hour or so midday today.

Mark


Re: Transmitter IMD testing

John Lemay
 

Andy and Barry

 

Many thanks for the quick replies – very helpful.

 

John

 

From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of Andy G4JNT
Sent: 02 January 2021 16:47
To: UK Microwaves groups.io
Subject: Re: [UKMicrowaves] Transmitter IMD testing

 

Sufficient to give you the rated PEP.

To maintain constant CW/PEP levels, the level of each of the two tones should be 6dB down on that of a single tone

The mean power of the two tones is then 3dB down on that of a single tone, and the RF SHOULD also be 3dB down on an average reading (thermal) power meter.

 

The fact that it's unlikely to be 3dB down in practice is : 

   a) Non-linearity

   b) If you use a diode power meter, it cannot read proper mean power.

 

 

 

On Sat, 2 Jan 2021 at 16:19, John Lemay <john@...> wrote:

Hello all

I thought it might be interesting to look at the IMD of my radio at the
transverter output. I have an audio two tone source, a choice of radios and
a spectrum analyser.

It's very quickly become evident that the results I get are greatly affected
by the input level of the two tones (no surprise!), but it begs the question
- relative to a single tone, what should the two tone levels be ?

Thus far I have understood that they should be non-harmonically related, and
a popular choice is 700 and 1900Hz and their level should be equal.

Thanks, in anticipation of a simple answer !

John G4ZTR



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https://www.avg.com






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Chipbank Crystals

Michael Scott
 

Hi All

Happy New Year!

A week or two ago in a posting on recent additions to the Chipbank I mentioned that I had received a donation of a large number of crystals. They came in a box about 1 foot cube and were all in small plastic bags marked with either a frequency or a PMR frequency in the 450MHz range. in the latter case the frequency marked on the crystal was a 27th of the frequency on the bag. In all, there are at least 2000 bags!

Some of the bags contained only one or two crystals, others many more. I have done a preliminary sort and firstly selected those bags with five or more crystals ( about 500 ). A second sort produced about 70 bags with at least 10 crystals. In some  cases many more. Based on a few tested at random , those in the 4 -16 MHz range are fundamental, those in the mid range are 3rd overtone, and the higher range are 5th overtone. This was based on a comparison of the marked frequency and the frequency in a simple oscillator or by using the tracking generator on my spectrum analyser.

When I next update the Chipbank catalogue, sometime in the next month or so, I will add a new file for crystals, but in the meantime, I am attaching a list of the frequencies of which we have more than ten units. These are mainly HC49U wire ended cases with a few in smaller cases about 8x7x2mm HxWxD. I couldn't find the  exact type number on Google. The majority have the HyQ logo on them.

Depending on the interest, or lack of it, in the attached list, I may sort through some more of the bags.

As usual, they are free to members of the UKuG. Please request on the usual forms.

73, Mike, G3LYP


Re: Transmitter IMD testing

Andy G4JNT
 

Sufficient to give you the rated PEP.
To maintain constant CW/PEP levels, the level of each of the two tones should be 6dB down on that of a single tone
The mean power of the two tones is then 3dB down on that of a single tone, and the RF SHOULD also be 3dB down on an average reading (thermal) power meter.

The fact that it's unlikely to be 3dB down in practice is : 
   a) Non-linearity
   b) If you use a diode power meter, it cannot read proper mean power.



On Sat, 2 Jan 2021 at 16:19, John Lemay <john@...> wrote:
Hello all

I thought it might be interesting to look at the IMD of my radio at the
transverter output. I have an audio two tone source, a choice of radios and
a spectrum analyser.

It's very quickly become evident that the results I get are greatly affected
by the input level of the two tones (no surprise!), but it begs the question
- relative to a single tone, what should the two tone levels be ?

Thus far I have understood that they should be non-harmonically related, and
a popular choice is 700 and 1900Hz and their level should be equal.

Thanks, in anticipation of a simple answer !

John G4ZTR



--
This email has been checked for viruses by AVG.
https://www.avg.com







Transmitter IMD testing

John Lemay
 

Hello all

I thought it might be interesting to look at the IMD of my radio at the
transverter output. I have an audio two tone source, a choice of radios and
a spectrum analyser.

It's very quickly become evident that the results I get are greatly affected
by the input level of the two tones (no surprise!), but it begs the question
- relative to a single tone, what should the two tone levels be ?

Thus far I have understood that they should be non-harmonically related, and
a popular choice is 700 and 1900Hz and their level should be equal.

Thanks, in anticipation of a simple answer !

John G4ZTR



--
This email has been checked for viruses by AVG.
https://www.avg.com


Re: EPROM programmer?

Clint Sharp <cjaysharp@...>
 

Ditto to Andy's offer, I have Dataman 48XP that supports the devices listed here:

Happy to program, read etc. but if your device needs a pin adapter then I'm afraid I'm unable to help unless you can provide one or the bits to make it.



On Fri, 1 Jan 2021 at 13:12, Andy <mm0fmf@...> wrote:
If anyone wants EPROMS programming, I can do 2708 to 27256. I think I
can do 27512 devices too. It has a serial port as does this PC (a real
one). If you have the image in Intel HEX or Motorola S-Records then I
can download and programme devices for you. I can also upload them and
save them in HEX or S-Record format.

Contact me off-group.

I know I have the manual safe for it somewhere but I'm not sure where! I
used to use every day in my job for 6 years and I thought the key
sequences were burnt into my head. But that was at least 25 years back.
I did programme something 10 years ago which is when I found the manual
and put it somewhere safe.

As I said, if you need something programming/copying/downloading etc.
get in touch. I also have a UV eraser.

73
Andy








--
Clint. M0UAW IO83

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


Re: EPROM programmer?

Alan Beard
 

Hi guys,

I can here too, Sydney, Australia.
And I have a fair collection of eproms, lots from NCD X terminals.

Be careful though, some radios such as the Plessey MTR-8000 series
will not work with a CMOS eprom, so need the NMOS type.

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

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