Date   

Re: Bending dish ribs any tips or tricks?

John Fell
 

David,
You can hand form the box section .
Find a 1m length of good solid hardwood - something like 35-50mm thick and cut a square hole through the thickness such that the section to be formed will just pass .
Clamp wood into a solid bench vice or one mounted on a solid pillar drill stand , with the square hole set to have its sides vertical and horizontal .

Pass the section through the hole and apply a gentle downwards force at around 1 metre from the hole .You will be able to "feel" the required effort needed to bend the section .
Remove section and offer up to your rib template to determine if bend is conforming to the shape - reverse thrust if required or try bending more if needed.
It is better to underbend at this stage as work hardening will occur with each applied effort stroke .

When happy push section approx 100mm further through hole than the first bend point and repeat the bending  stage - remove and test each time you perform a bend and progress along full rib length ,testing against template as you go .

Ensure the hole does not move from its initial set point and that the applied force is vertically downwards , to avoid any tendency to spiral the formed section.

Although a slow process you should finish up with the full rib following the template and it should be plenty good enough into the mid microwave area .

73
John
G0API

On Wed, 26 Aug 2020 at 16:22, David Law <law1274@...> wrote:
Hi, I'm on Mk2 of my 4m 0.38f/d dish project this time using traditional square tube and stiffening ribs.
The material will be 18mm x 1.6mm square tube.
I've made a template from wood sheet.
I wondered if anyone has any tips or tricks in how to form a nice smooth accurate reproduceable parabola.
Or indeed what not to do! Roll bending machines are not really in the budget for a one off project.
It will be attached to the stiffening rib via trusses and riveted plates which will avoid using a welder. 
It's for 23cm at this time and likely to stay that way so points of mm accuracy isn't too important.
I touched base with Howard, g4cch a while ago who gave me some tips, but the more advice based on experience the better.
David
PS Mk 1 used 1/2" round tube on a hub but it was too floppy (probably only good up to a 2m dish)
If anyone wants any bent 1/2" round tube let me know!


Re: Wanted - surplus box with large panel meter

Adrian G4UVZ
 

If you are looking for a hi quality analogue meter ..I have this 60microamp movement with over 6 inch active scale ..mirrored of course !
You can't beat an analgue meter for tweaking!  digital is fine for an absolute measurement ..but for tweaking with digital the brain has to do continuous D to A conversion!!! ...........discuss
Adrian

Pm me if this is of interest


Re: 6M 2M 23cm stacking distance

Paul Randall G3NJV
 

Decimated  Dr ?



Sent from my Samsung Galaxy smartphone.



-------- Original message --------
From: KENT BRITAIN <WA5VJB@...>
Date: 26/08/2020 00:01 (GMT+00:00)
To: ukmicrowaves@groups.io, UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] 6M 2M 23cm stacking distance

Hi Robin

At a UKuG round table several years ago, a German ham said
I was the only American (Not exactly, I'm from Texas) who spoke Metric.

Cheers Kent      (My mother never knew Kent was a county in SE UK)

On Tuesday, August 25, 2020, 5:18:17 PM CDT, G8DQX list <list@...> wrote:


Kent,

but, but, surely your readers are familiar with a unit named after a
famous Scottish Dr. who emigrated to the USA, or, more accurately, ⅒ of
said Doctor (and his famous laboratories)?

Robin

PS: Mine's an Imperial pint, not one of those measly Queen Anne pints
still used in the colonies.

PPS: It's all metric anyhow, more or less since the day it was
discovered, after the fire that burnt the place down, that all three
etalons for the British Yard were kept in the then Houses of Parliament.
Oops!

On 25/08/2020 20:46, KENT BRITAIN wrote:
> Hi Robin
>
> Well, that was part of my next antenna column and most of my
> readers would not really understand the significance of -23 dBm
> reflected power.
> Hey inches, feet, yards, rods, furlongs, and miles ..... is your
> system! hihi
>
> Yes, I think in dB Return loss then have to mentally convert to SWR
> for my readers.
>
> It is a challenge to speak to all technical levels in the same
> column.  73 Kent




Re: Wanted - surplus box with large panel meter

Conrad, PA5Y
 

I think that the idea of a big meter is so that moon noise can be peaked easily, a slow damped movement such as an AVO is really not what you want for that. You want something fairly fast but big so that you can easily see small changes. I am pretty sure that Howard is not trying to make a lab grade instrument.

 

Regards

 

Conrad PA5Y

 

From: UKMicrowaves@groups.io <UKMicrowaves@groups.io> On Behalf Of Dr. David Kirkby, Kirkby Microwave Ltd via groups.io
Sent: 26 August 2020 21:24
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] Wanted - surplus box with large panel meter

 

On Wed, 26 Aug 2020 at 13:29, g4cch_1 <g4cch_1@...> wrote:

I am building a noise power meter, and am looking for surplus box with a large panel meter. Ideally the meter should be 500uA or 1mA. An old power supply, or anything non functional with a large panel meter may be suitable.

Please email me offline if you have anything that may be suitable, with a photo and dimensions.

Thanks and 73
Howard, G4CCH

 

How about getting an old AVO meter? That will have a mirrored scale, so about the best you will get. 

 

To what sort of uncertainty do you expect to be able to measure noise power? I don’t really see why you need a large meter to measure something that you are not going to be able to measure very accurately. The needle is not even going to be stationary when making a measurement of noise power, so I don’t think even quantitative measurements require a large meter. 

 

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: Wanted - surplus box with large panel meter

Andy G4JNT
 

Or a line-of-LEDs.   Noise provides sufficient jitter to give a smooth transition from one LED to the next
Or a bar-graph on a PC



On Wed, 26 Aug 2020 at 21:32, Robin Szemeti - G1YFG <robin@...> wrote:
If you average the reading over a sufficient length of time, it should be stable enough ... I would have thought these days a digital meter and a suitably large R/C network might have been the way to go.


On Wed, 26 Aug 2020 at 20:24, Dr. David Kirkby, Kirkby Microwave Ltd <drkirkby@...> wrote:
On Wed, 26 Aug 2020 at 13:29, g4cch_1 <g4cch_1@...> wrote:
I am building a noise power meter, and am looking for surplus box with a large panel meter. Ideally the meter should be 500uA or 1mA. An old power supply, or anything non functional with a large panel meter may be suitable.

Please email me offline if you have anything that may be suitable, with a photo and dimensions.

Thanks and 73
Howard, G4CCH

How about getting an old AVO meter? That will have a mirrored scale, so about the best you will get. 

To what sort of uncertainty do you expect to be able to measure noise power? I don’t really see why you need a large meter to measure something that you are not going to be able to measure very accurately. The needle is not even going to be stationary when making a measurement of noise power, so I don’t think even quantitative measurements require a large meter. 

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


--
Robin Szemeti - G1YFG


Re: Wanted - surplus box with large panel meter

Robin Szemeti - G1YFG
 

If you average the reading over a sufficient length of time, it should be stable enough ... I would have thought these days a digital meter and a suitably large R/C network might have been the way to go.


On Wed, 26 Aug 2020 at 20:24, Dr. David Kirkby, Kirkby Microwave Ltd <drkirkby@...> wrote:
On Wed, 26 Aug 2020 at 13:29, g4cch_1 <g4cch_1@...> wrote:
I am building a noise power meter, and am looking for surplus box with a large panel meter. Ideally the meter should be 500uA or 1mA. An old power supply, or anything non functional with a large panel meter may be suitable.

Please email me offline if you have anything that may be suitable, with a photo and dimensions.

Thanks and 73
Howard, G4CCH

How about getting an old AVO meter? That will have a mirrored scale, so about the best you will get. 

To what sort of uncertainty do you expect to be able to measure noise power? I don’t really see why you need a large meter to measure something that you are not going to be able to measure very accurately. The needle is not even going to be stationary when making a measurement of noise power, so I don’t think even quantitative measurements require a large meter. 

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


--
Robin Szemeti - G1YFG


Re: Wanted - surplus box with large panel meter

 

On Wed, 26 Aug 2020 at 13:29, g4cch_1 <g4cch_1@...> wrote:
I am building a noise power meter, and am looking for surplus box with a large panel meter. Ideally the meter should be 500uA or 1mA. An old power supply, or anything non functional with a large panel meter may be suitable.

Please email me offline if you have anything that may be suitable, with a photo and dimensions.

Thanks and 73
Howard, G4CCH

How about getting an old AVO meter? That will have a mirrored scale, so about the best you will get. 

To what sort of uncertainty do you expect to be able to measure noise power? I don’t really see why you need a large meter to measure something that you are not going to be able to measure very accurately. The needle is not even going to be stationary when making a measurement of noise power, so I don’t think even quantitative measurements require a large meter. 

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: Wanted - surplus box with large panel meter

Colin Ranson
 

Howard,

 

I have a brand new, never used but old stock HP 435, Dated 1983 (I think ) Bought in anticipation of getting a head, but never happened.  Now using a 10GHz log detector.

 

g8lbs@...

 

regards

 

Colin de G8LBS.

 

Sent from Mail for Windows 10

 

From: g4cch_1
Sent: 26 August 2020 17:58
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] Wanted - surplus box with large panel meter

 

OK Adrian, the meter looks a bit small for my purposes.

Has anyone in the UK got a non working HP432 or 435 Power Meter?

Thanks and 73
Howard

 


Re: Wanted - surplus box with large panel meter

g4cch_1
 

OK Adrian, the meter looks a bit small for my purposes.

Has anyone in the UK got a non working HP432 or 435 Power Meter?

Thanks and 73
Howard


Bending dish ribs any tips or tricks?

David Law
 

Hi, I'm on Mk2 of my 4m 0.38f/d dish project this time using traditional square tube and stiffening ribs.
The material will be 18mm x 1.6mm square tube.
I've made a template from wood sheet.
I wondered if anyone has any tips or tricks in how to form a nice smooth accurate reproduceable parabola.
Or indeed what not to do! Roll bending machines are not really in the budget for a one off project.
It will be attached to the stiffening rib via trusses and riveted plates which will avoid using a welder. 
It's for 23cm at this time and likely to stay that way so points of mm accuracy isn't too important.
I touched base with Howard, g4cch a while ago who gave me some tips, but the more advice based on experience the better.
David
PS Mk 1 used 1/2" round tube on a hub but it was too floppy (probably only good up to a 2m dish)
If anyone wants any bent 1/2" round tube let me know!


Re: Wanted - surplus box with large panel meter

Adrian G4UVZ
 

Not sure if this is any good ..meter I am pretty sure has a shunt...contains a 12 volt working PSU 

Adrian


Wanted - surplus box with large panel meter

g4cch_1
 

I am building a noise power meter, and am looking for surplus box with a large panel meter. Ideally the meter should be 500uA or 1mA. An old power supply, or anything non functional with a large panel meter may be suitable.

Please email me offline if you have anything that may be suitable, with a photo and dimensions.

Thanks and 73
Howard, G4CCH


Re: CANFI noise heads ...

Alan Melia
 


Robin, diode or zener noise can be quite variable depending in chip structure, and the quality of fabrication. Modern BJTs may be more consistent than at the time Paul describes.  It may be worth obtaining some diodes from Noisecom which are designed for this service. They are not cheap compared with standard silicon diodes but, I believe, are fabricated to avoid the problems of surface effects.
 
Alan
G3NYK
 

----- Original Message -----
Sent: Wednesday, August 26, 2020 9:56 AM
Subject: Re: [UKMicrowaves] CANFI noise heads ...

I think although the particular dongle mentioned is difficult to obtain, there are plenty of others that will work, I have one already on hand from Smaart that appears to work (at least the software appears to think it works anyway) so I think that part is OK. What matters, as far as I can tell from the article, is that the chipset has the required access programmatically to the various gain stages.

I plan to build a few up, at least 5, which should be enough to get an idea of ENR variation, I also have someone who can check the calibration, I may send a few to him for a check. Hopefully, the Zener will be a little more consistent.

I was planning to simply arrange all the strips of components in a row on tape, with coloured pen applied as well, and then simply snip off a strip of 2 components from the end, which should in theory be a set for 2 boards ... it may even work!

On Wed, 26 Aug 2020 at 08:34, Paul Randall G3NJV <paulfrandall@...> wrote:
Hi Robin,  thanks for that.
Masking tape?
  I made a noise figure meter about 30 years ago to a published design, the noise was switched on/off at about 30hz and the rx af out processed to display the ratio between these two states.  It didn't work, fundamentally flawed because in ssb bandwidth measured noise power is all over the place, momentary variations greater than what you were trying to measure.  
Mention it now because the noise generator used then was a reverse biased rf transistor junction. I sampled a dozen or so transistors of the same type and they had large variation in noise output and also different frequency responses.  
If you are making a few up it would be interesting to compare them to get an idea if the modern diodes in this design exhibit the same spread of performance. 
I came across CANFI a few years ago,  was impressed by the clever idea. Looking this week the tv dongle mentioned in the article seems to have become unobtainium.

Cheers Paul

Sent from my Samsung Galaxy smartphone.



-------- Original message --------
From: Robin Szemeti - G1YFG <robin@...>
Date: 25/08/2020 10:52 (GMT+00:00)
Subject: Re: [UKMicrowaves] CANFI noise heads ...

The boards and components are here, when I have built one to check it and worked out how to sensibly mark up components they'll go out, probably this weekend.  I'll provide the schematic, the link to the original CANFI article, a board layout and some sort of component list and basic instructions.  For God's sake don't ask me anything about CANFI, I have yet to even figure it all out let alone get it working.

What would (in hindsight) have made more sense rather than hand soldering and a kit of bits  would have been to order a paste stencil and mount all the components on the SMT machine,  then you'd get a fully assembled board ... as I was thinking I'd do 2 for myself and maybe a couple of people would be interested at most, I didn't bother with the stencil  ... with 23 people on the list, it has been more popular than I imagined.

I think I have responded to everyone who asked to tell them they are on the list, if you did NOT get a response from me, ping me again.

If anyone who has asked for one thinks they will struggle to mount the surface mount devices, can they let me know off list, and I will hand solder them.   I am planning to send a couple of boards and components (for at least most of the list) so if you mess one up, you have a second shot ;)

On Wed, 19 Aug 2020 at 17:34, Robin Szemeti - G1YFG via groups.io <robin=redpoint.org.uk@groups.io> wrote:
Thank you to all those that responded so far,  boards will be here in about a week.  No need to offer PayPal or anything like that, I shall just send them out.   The boards cost me 10p each, the components a similar amount, I'd rather just stick a stamp on them and send them.

There are plenty more, it was a batch of 50, I would say about half are spoken for.

I'll include a bag of components  .. you'll have to find the SMA connector yourselves.   

On Wed, 19 Aug 2020 at 12:04, Robin Szemeti - G1YFG via groups.io <robin=redpoint.org.uk@groups.io> wrote:
I have ordered a bunch of PCBs to make some noise heads for the CANFI noise figure meter.  They should be here in a week or so.

I have plenty of spare boards as it was just as cheap to order 50 as it was to order 5.

If anyone wants a few, can they PM me their address, and I'll pop them in the mail when they arrive. If the "chip bank" wants the remainder I can send them along.

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


--
Robin Szemeti - G1YFG


--
Robin Szemeti - G1YFG


--
Robin Szemeti - G1YFG


Re: CANFI noise heads ...

Robin Szemeti - G1YFG
 

I think although the particular dongle mentioned is difficult to obtain, there are plenty of others that will work, I have one already on hand from Smaart that appears to work (at least the software appears to think it works anyway) so I think that part is OK. What matters, as far as I can tell from the article, is that the chipset has the required access programmatically to the various gain stages.

I plan to build a few up, at least 5, which should be enough to get an idea of ENR variation, I also have someone who can check the calibration, I may send a few to him for a check. Hopefully, the Zener will be a little more consistent.

I was planning to simply arrange all the strips of components in a row on tape, with coloured pen applied as well, and then simply snip off a strip of 2 components from the end, which should in theory be a set for 2 boards ... it may even work!


On Wed, 26 Aug 2020 at 08:34, Paul Randall G3NJV <paulfrandall@...> wrote:
Hi Robin,  thanks for that.
Masking tape?
  I made a noise figure meter about 30 years ago to a published design, the noise was switched on/off at about 30hz and the rx af out processed to display the ratio between these two states.  It didn't work, fundamentally flawed because in ssb bandwidth measured noise power is all over the place, momentary variations greater than what you were trying to measure.  
Mention it now because the noise generator used then was a reverse biased rf transistor junction. I sampled a dozen or so transistors of the same type and they had large variation in noise output and also different frequency responses.  
If you are making a few up it would be interesting to compare them to get an idea if the modern diodes in this design exhibit the same spread of performance. 
I came across CANFI a few years ago,  was impressed by the clever idea. Looking this week the tv dongle mentioned in the article seems to have become unobtainium.

Cheers Paul

Sent from my Samsung Galaxy smartphone.



-------- Original message --------
From: Robin Szemeti - G1YFG <robin@...>
Date: 25/08/2020 10:52 (GMT+00:00)
Subject: Re: [UKMicrowaves] CANFI noise heads ...

The boards and components are here, when I have built one to check it and worked out how to sensibly mark up components they'll go out, probably this weekend.  I'll provide the schematic, the link to the original CANFI article, a board layout and some sort of component list and basic instructions.  For God's sake don't ask me anything about CANFI, I have yet to even figure it all out let alone get it working.

What would (in hindsight) have made more sense rather than hand soldering and a kit of bits  would have been to order a paste stencil and mount all the components on the SMT machine,  then you'd get a fully assembled board ... as I was thinking I'd do 2 for myself and maybe a couple of people would be interested at most, I didn't bother with the stencil  ... with 23 people on the list, it has been more popular than I imagined.

I think I have responded to everyone who asked to tell them they are on the list, if you did NOT get a response from me, ping me again.

If anyone who has asked for one thinks they will struggle to mount the surface mount devices, can they let me know off list, and I will hand solder them.   I am planning to send a couple of boards and components (for at least most of the list) so if you mess one up, you have a second shot ;)

On Wed, 19 Aug 2020 at 17:34, Robin Szemeti - G1YFG via groups.io <robin=redpoint.org.uk@groups.io> wrote:
Thank you to all those that responded so far,  boards will be here in about a week.  No need to offer PayPal or anything like that, I shall just send them out.   The boards cost me 10p each, the components a similar amount, I'd rather just stick a stamp on them and send them.

There are plenty more, it was a batch of 50, I would say about half are spoken for.

I'll include a bag of components  .. you'll have to find the SMA connector yourselves.   

On Wed, 19 Aug 2020 at 12:04, Robin Szemeti - G1YFG via groups.io <robin=redpoint.org.uk@groups.io> wrote:
I have ordered a bunch of PCBs to make some noise heads for the CANFI noise figure meter.  They should be here in a week or so.

I have plenty of spare boards as it was just as cheap to order 50 as it was to order 5.

If anyone wants a few, can they PM me their address, and I'll pop them in the mail when they arrive. If the "chip bank" wants the remainder I can send them along.

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


--
Robin Szemeti - G1YFG


--
Robin Szemeti - G1YFG


--
Robin Szemeti - G1YFG


Re: CANFI noise heads ...

Paul Randall G3NJV
 

Hi Robin,  thanks for that.
Masking tape?
  I made a noise figure meter about 30 years ago to a published design, the noise was switched on/off at about 30hz and the rx af out processed to display the ratio between these two states.  It didn't work, fundamentally flawed because in ssb bandwidth measured noise power is all over the place, momentary variations greater than what you were trying to measure.  
Mention it now because the noise generator used then was a reverse biased rf transistor junction. I sampled a dozen or so transistors of the same type and they had large variation in noise output and also different frequency responses.  
If you are making a few up it would be interesting to compare them to get an idea if the modern diodes in this design exhibit the same spread of performance. 
I came across CANFI a few years ago,  was impressed by the clever idea. Looking this week the tv dongle mentioned in the article seems to have become unobtainium.

Cheers Paul

Sent from my Samsung Galaxy smartphone.



-------- Original message --------
From: Robin Szemeti - G1YFG <robin@...>
Date: 25/08/2020 10:52 (GMT+00:00)
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] CANFI noise heads ...

The boards and components are here, when I have built one to check it and worked out how to sensibly mark up components they'll go out, probably this weekend.  I'll provide the schematic, the link to the original CANFI article, a board layout and some sort of component list and basic instructions.  For God's sake don't ask me anything about CANFI, I have yet to even figure it all out let alone get it working.

What would (in hindsight) have made more sense rather than hand soldering and a kit of bits  would have been to order a paste stencil and mount all the components on the SMT machine,  then you'd get a fully assembled board ... as I was thinking I'd do 2 for myself and maybe a couple of people would be interested at most, I didn't bother with the stencil  ... with 23 people on the list, it has been more popular than I imagined.

I think I have responded to everyone who asked to tell them they are on the list, if you did NOT get a response from me, ping me again.

If anyone who has asked for one thinks they will struggle to mount the surface mount devices, can they let me know off list, and I will hand solder them.   I am planning to send a couple of boards and components (for at least most of the list) so if you mess one up, you have a second shot ;)

On Wed, 19 Aug 2020 at 17:34, Robin Szemeti - G1YFG via groups.io <robin=redpoint.org.uk@groups.io> wrote:
Thank you to all those that responded so far,  boards will be here in about a week.  No need to offer PayPal or anything like that, I shall just send them out.   The boards cost me 10p each, the components a similar amount, I'd rather just stick a stamp on them and send them.

There are plenty more, it was a batch of 50, I would say about half are spoken for.

I'll include a bag of components  .. you'll have to find the SMA connector yourselves.   

On Wed, 19 Aug 2020 at 12:04, Robin Szemeti - G1YFG via groups.io <robin=redpoint.org.uk@groups.io> wrote:
I have ordered a bunch of PCBs to make some noise heads for the CANFI noise figure meter.  They should be here in a week or so.

I have plenty of spare boards as it was just as cheap to order 50 as it was to order 5.

If anyone wants a few, can they PM me their address, and I'll pop them in the mail when they arrive. If the "chip bank" wants the remainder I can send them along.

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


--
Robin Szemeti - G1YFG


--
Robin Szemeti - G1YFG


Re: Surplus Items

Pete G4HQX
 

On Tue, Aug 25, 2020 at 01:39 PM, Ken G3YKI wrote:
http://www.hince.plus.com/Microwaves/Sales.html
link appears broken

Pete


Re: 6M 2M 23cm stacking distance

KENT BRITAIN
 

Hi Robin

At a UKuG round table several years ago, a German ham said
I was the only American (Not exactly, I'm from Texas) who spoke Metric.

Cheers Kent      (My mother never knew Kent was a county in SE UK)

On Tuesday, August 25, 2020, 5:18:17 PM CDT, G8DQX list <list@...> wrote:


Kent,

but, but, surely your readers are familiar with a unit named after a
famous Scottish Dr. who emigrated to the USA, or, more accurately, ⅒ of
said Doctor (and his famous laboratories)?

Robin

PS: Mine's an Imperial pint, not one of those measly Queen Anne pints
still used in the colonies.

PPS: It's all metric anyhow, more or less since the day it was
discovered, after the fire that burnt the place down, that all three
etalons for the British Yard were kept in the then Houses of Parliament.
Oops!

On 25/08/2020 20:46, KENT BRITAIN wrote:
> Hi Robin
>
> Well, that was part of my next antenna column and most of my
> readers would not really understand the significance of -23 dBm
> reflected power.
> Hey inches, feet, yards, rods, furlongs, and miles ..... is your
> system! hihi
>
> Yes, I think in dB Return loss then have to mentally convert to SWR
> for my readers.
>
> It is a challenge to speak to all technical levels in the same
> column.  73 Kent




Re: 6M 2M 23cm stacking distance

G8DQX list
 

Kent,

but, but, surely your readers are familiar with a unit named after a famous Scottish Dr. who emigrated to the USA, or, more accurately, ⅒ of said Doctor (and his famous laboratories)?

Robin

PS: Mine's an Imperial pint, not one of those measly Queen Anne pints still used in the colonies.

PPS: It's all metric anyhow, more or less since the day it was discovered, after the fire that burnt the place down, that all three etalons for the British Yard were kept in the then Houses of Parliament. Oops!

On 25/08/2020 20:46, KENT BRITAIN wrote:
Hi Robin

Well, that was part of my next antenna column and most of my
readers would not really understand the significance of -23 dBm reflected power.
Hey inches, feet, yards, rods, furlongs, and miles ..... is your system! hihi

Yes, I think in dB Return loss then have to mentally convert to SWR for my readers.

It is a challenge to speak to all technical levels in the same column.  73 Kent


Re: LDF4-50 - Good trader

Reg Woolley
 

Peterborough 
De g8vhi 



Sent from Samsung tablet.


-------- Original message --------
From: John Lemay <john@...>
Date: 25/08/2020 08:17 (GMT+00:00)
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] LDF4-50 - Good trader

What part of the country is this chap located in ?

 

John G4ZTR

 

From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of g3zqu via groups.io
Sent: 25 August 2020 08:03
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] LDF4-50 - Good trader

 

Just a heads up ...
I know Ralph from a profesional point of view and would just point out that the mobilephone  industry used a lot of RFS cable as opposed to Andrew. The RFS cable is not compatable with Andrew connectors, one has a spiral corregation jacket and the other concentric corregations I believe.

Martin G3ZQU


Virus-free. www.avg.com


Re: 6M 2M 23cm stacking distance

KENT BRITAIN
 

Hi Robin

Well, that was part of my next antenna column and most of my
readers would not really understand the significance of -23 dBm reflected power.
Hey inches, feet, yards, rods, furlongs, and miles ..... is your system! hihi

Yes, I think in dB Return loss then have to mentally convert to SWR for my readers.

It is a challenge to speak to all technical levels in the same column.  73 Kent



On Tuesday, August 25, 2020, 11:20:42 AM CDT, G8DQX list <list@...> wrote:


Dear Kent,

trust me, -13dBm, or even -43dBW, is much simpler to understand and manipulate than ".00005 watts from the bridge".

Or is it that you live in a land where, apparently, Physics is still taught using CGS, rather than SI, units?

73, Stay Safe,

Robin, G8DQX

On 24/08/2020 19:27, KENT BRITAIN wrote:
73 Kent

PS Yes, I could have used -13 dBm and -23 dBm, but how many of my readers would have
      really understood the magnitude of those numbers?

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