Date   

Midlands Microwave Round Table

Paul G8AQA
 

All,

     FYI. Please find below details about the Midlands RT and ATV event
for 2019. For those who are new to this it is a small (ish) friendly
group of radio enthusiasts all getting together to
discuss/make/test/learn/assist all things radio, microwave and ATV.

    The Event is on the weekend of 14th/15th December 2019 at Eaton
Manor, Shropshire. https://www.eatonmanor.co.uk/

    10am to 5pm on the Saturday, then out on the hills (or indoors if
the weather is bad) for operating/testing on the Sunday. If there is
sufficient interest we will arrange a table for dinner on the Friday
and/or Saturday evenings. Please let us know if you are coming so we can
arrange food and tables for dinner:  heather@...   07802
548 938.

    As before, the emphasis will be on making, debugging and testing
Microwave (and all things radio) projects. There will be a couple of
talks during the day and tables set aside for bring and buy but the main
focus will be on the large array of test and assembly equipment and,
most importantly, lots of expertises on hand to help get your projects
up and running. As well as the usual Spectrum Analysers, Power Meters
and so on, we will also have SMD rework/assembly facilities, High
Altitude Balloon testing, Antenna Testing, DATV systems and a full QO100
SSB and DATV station.

    We have reserved one of the Estate's Holiday Cottages to provide
accommodation for visitors to the event. All rooms are en-suite,
available as double/twin (and possibly triple) beds and will cost £110
per room, for the weekend (Friday and Saturday nights). There may be an
option on the Sunday night as well. Guests can arrive from 5pm on Friday
and we will be ready to kick stuff off on the Friday evening is people
want to start doing things as soon as they arrive. Please contact Eaton
Manor on 01694 724 814 to book a room.

    The Event itself will cost £10 per person, this covers refreshments
and a full cooked lunch on Saturday (which has been superb for the past
events we have held) and access to Brown Clee on the Sunday.

Heather

--
Heather M0HMO
07802 548 938


Re: SSPA Metering

Andy G4JNT
 

I use a 16F688 PIC, customised to each PA.   Apart from current and supply volts, it also monitors RF FWD and RTN, controls sequencing and bias witj overlaod protection / cutoff and drives a bargraph display of power out.   Each is customised to an individual task, so not able to publish any useful .ASM code



On Tue, 19 Nov 2019 at 15:37, Mike Willis <willis.mj@...> wrote:
I would use an Arduino nano but if you won't use a tine computer you are back to using meter shunts and redrawing the scales.
--
Mike G0MJW


Re: SSPA Metering

Mike Willis
 

I would use an Arduino nano but if you won't use a tine computer you are back to using meter shunts and redrawing the scales.
--
Mike G0MJW


Re: 122GHz antennas

KENT BRITAIN
 

Hi Neil    I have the data one the 001 chip, didn't know the 002 left out those pins.   Bummer!  Kent

On Tuesday, November 19, 2019, 4:21:48 AM CST, Neil Smith G4DBN <neil@...> wrote:


Sadly, there are no I/Q inputs on the 122 chips, but there is a transmit enable.  I don't see any reference to whether that has a Schmitt trigger response or if it is at least slightly analogue and could be used for modulation, with some sort of inverse response curve in a DAC or something?  Even if it has hysteresis, could it be used for an on-off tone modulation?  Could it perhaps be used with pulse width modulation?

Neil G4DBN


From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of KENT BRITAIN
Sent: 19 November 2019 02:52
To: UKMicrowaves@groups.io
Subject: [UKMicrowaves] 122GHz antennas

 

Got a question for the group.

 

Having done a lot of work with 94 GHz, I realize just how much fun it is to

align a millimeter system for best performance.   Both focus and

sighting.

 

The plan is to modulate one of the boards with 1000 Hz AM and test on

the antenna range.  Now the HP415 detector can be connected to the 145 MHz

port and dB's directly read.   And a relatively close object to align the sights on.

 

Would AM modulation be as simple as connecting a function generator

(or 555 timer) directly to the I Q inputs and hit both with the 1000 Hz in

phase?    I would expect slightly more output that way vs just the I or Q port.

going logic level high.

 

Kent  G8EMY

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
-- 
Neil
<a href="http://g4dbn.uk/"><small>g4dbn.uk</small></a>


Re: 122GHz antennas

KENT BRITAIN
 

I once generated a 10 GHz test signal by sweeping a Gunn over a 10 GHz Passband filter.
But a 122 GHz filter with a fraction of a GHz bandwidth would be a big project to itself.

Kent

On Tuesday, November 19, 2019, 4:51:31 AM CST, Neil Smith G4DBN <neil@...> wrote:


I think Kent was looking for a way to get an AM signal into an HP415 as an envelope detector, which If I remember right has a narrow 1kHz audio filter.  Even a very wide shift wouldn't work if he was looking at the envelope of the I or Q output directly at audio.  I might have the wrong end of the stick (as usual) though!

Neil G4DBN

On 19/11/2019 10:33, Andy G4JNT wrote:
Modify the PIC code to reprog the synth in response to an input line.   if you move the frequency sufficiently far away. must surely be able to get outside the passband of measuring kit, hence simulating on/off

But why not just stick with FSK?

And wherever try to linearly modulate the amplitude?



On Tue, 19 Nov 2019 at 10:21, Neil Smith G4DBN <neil@...> wrote:

Sadly, there are no I/Q inputs on the 122 chips, but there is a transmit enable.  I don't see any reference to whether that has a Schmitt trigger response or if it is at least slightly analogue and could be used for modulation, with some sort of inverse response curve in a DAC or something?  Even if it has hysteresis, could it be used for an on-off tone modulation?  Could it perhaps be used with pulse width modulation?

Neil G4DBN


From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of KENT BRITAIN
Sent: 19 November 2019 02:52
To: UKMicrowaves@groups.io
Subject: [UKMicrowaves] 122GHz antennas

 

Got a question for the group.

 

Having done a lot of work with 94 GHz, I realize just how much fun it is to

align a millimeter system for best performance.   Both focus and

sighting.

 

The plan is to modulate one of the boards with 1000 Hz AM and test on

the antenna range.  Now the HP415 detector can be connected to the 145 MHz

port and dB's directly read.   And a relatively close object to align the sights on.

 

Would AM modulation be as simple as connecting a function generator

(or 555 timer) directly to the I Q inputs and hit both with the 1000 Hz in

phase?    I would expect slightly more output that way vs just the I or Q port.

going logic level high.

 

Kent  G8EMY

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
-- 
Neil
<a href="http://g4dbn.uk/"><small>g4dbn.uk</small></a>
-- 
Neil
<a href="http://g4dbn.uk/"><small>g4dbn.uk</small></a>


Re: 122GHz antennas

KENT BRITAIN
 

The idea is to use the I-Q modulation ports to generate an amplitude modulated sine wave.
In theory any modulation format can be generated from I and Q, I'm just looking for the simplest.

Kent

On Tuesday, November 19, 2019, 3:04:10 AM CST, Paul Bicknell <paul@...> wrote:


Hi Kent

 

The TRA -120-002  dues not have any AM modulation capabilities

And the modulation depth that is required will determine the dynamic rang of the test set up

 

So the measurement would have to be using a spectrum analyser  

this could be a possibility for the martelsham round table

 

Glad to talk more on the subject of line

 

Paul

 


From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of KENT BRITAIN
Sent: 19 November 2019 02:52
To: UKMicrowaves@groups.io
Subject: [UKMicrowaves] 122GHz antennas

 

Got a question for the group.

 

Having done a lot of work with 94 GHz, I realize just how much fun it is to

align a millimeter system for best performance.   Both focus and

sighting.

 

The plan is to modulate one of the boards with 1000 Hz AM and test on

the antenna range.  Now the HP415 detector can be connected to the 145 MHz

port and dB's directly read.   And a relatively close object to align the sights on.

 

Would AM modulation be as simple as connecting a function generator

(or 555 timer) directly to the I Q inputs and hit both with the 1000 Hz in

phase?    I would expect slightly more output that way vs just the I or Q port.

going logic level high.

 

Kent  G8EMY

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: 122GHz antennas

KENT BRITAIN
 

Better be, my PayPal for $333 was accepted.     2 assembled boards, one each of the feeds, and 2 blank boards.

Kent

On Tuesday, November 19, 2019, 3:34:05 AM CST, Paul Bicknell <paul@...> wrote:


Hi Kent

 

Just noticed you are not on the list for orders for the 122 ghz project

So you may not be using a TRA - 120 - 002 devise

 

Paul


From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of KENT BRITAIN
Sent: 19 November 2019 02:52
To: UKMicrowaves@groups.io
Subject: [UKMicrowaves] 122GHz antennas

 

Got a question for the group.

 

Having done a lot of work with 94 GHz, I realize just how much fun it is to

align a millimeter system for best performance.   Both focus and

sighting.

 

The plan is to modulate one of the boards with 1000 Hz AM and test on

the antenna range.  Now the HP415 detector can be connected to the 145 MHz

port and dB's directly read.   And a relatively close object to align the sights on.

 

Would AM modulation be as simple as connecting a function generator

(or 555 timer) directly to the I Q inputs and hit both with the 1000 Hz in

phase?    I would expect slightly more output that way vs just the I or Q port.

going logic level high.

 

Kent  G8EMY

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: 122GHz antennas

Neil Smith G4DBN
 

I think Kent was looking for a way to get an AM signal into an HP415 as an envelope detector, which If I remember right has a narrow 1kHz audio filter.  Even a very wide shift wouldn't work if he was looking at the envelope of the I or Q output directly at audio.  I might have the wrong end of the stick (as usual) though!

Neil G4DBN

On 19/11/2019 10:33, Andy G4JNT wrote:
Modify the PIC code to reprog the synth in response to an input line.   if you move the frequency sufficiently far away. must surely be able to get outside the passband of measuring kit, hence simulating on/off

But why not just stick with FSK?

And wherever try to linearly modulate the amplitude?



On Tue, 19 Nov 2019 at 10:21, Neil Smith G4DBN <neil@...> wrote:

Sadly, there are no I/Q inputs on the 122 chips, but there is a transmit enable.  I don't see any reference to whether that has a Schmitt trigger response or if it is at least slightly analogue and could be used for modulation, with some sort of inverse response curve in a DAC or something?  Even if it has hysteresis, could it be used for an on-off tone modulation?  Could it perhaps be used with pulse width modulation?

Neil G4DBN


From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of KENT BRITAIN
Sent: 19 November 2019 02:52
To: UKMicrowaves@groups.io
Subject: [UKMicrowaves] 122GHz antennas

 

Got a question for the group.

 

Having done a lot of work with 94 GHz, I realize just how much fun it is to

align a millimeter system for best performance.   Both focus and

sighting.

 

The plan is to modulate one of the boards with 1000 Hz AM and test on

the antenna range.  Now the HP415 detector can be connected to the 145 MHz

port and dB's directly read.   And a relatively close object to align the sights on.

 

Would AM modulation be as simple as connecting a function generator

(or 555 timer) directly to the I Q inputs and hit both with the 1000 Hz in

phase?    I would expect slightly more output that way vs just the I or Q port.

going logic level high.

 

Kent  G8EMY

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
-- 
Neil
<a href="http://g4dbn.uk/"><small>g4dbn.uk</small></a>
-- 
Neil
<a href="http://g4dbn.uk/"><small>g4dbn.uk</small></a>


SSPA Metering

Dave Cawley G4IUG
 


SSPA Metering
 
I am building a couple of big amps and the only thing right now that is missing is metering.
 
I'm looking for :
 
0-100V
0-50A
 
0 - 2,000W peak bar graph with text value as well
0 - ? reverse power bar graph with text value as well
 
Any ideas that do not use tiny computers, like a PIC or something that will boot straight up ?
 
Thanks
 
Dave  G4IUG
 
 


Re: 122GHz antennas

Andy G4JNT
 

Modify the PIC code to reprog the synth in response to an input line.   if you move the frequency sufficiently far away. must surely be able to get outside the passband of measuring kit, hence simulating on/off

But why not just stick with FSK?

And wherever try to linearly modulate the amplitude?



On Tue, 19 Nov 2019 at 10:21, Neil Smith G4DBN <neil@...> wrote:

Sadly, there are no I/Q inputs on the 122 chips, but there is a transmit enable.  I don't see any reference to whether that has a Schmitt trigger response or if it is at least slightly analogue and could be used for modulation, with some sort of inverse response curve in a DAC or something?  Even if it has hysteresis, could it be used for an on-off tone modulation?  Could it perhaps be used with pulse width modulation?

Neil G4DBN


From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of KENT BRITAIN
Sent: 19 November 2019 02:52
To: UKMicrowaves@groups.io
Subject: [UKMicrowaves] 122GHz antennas

 

Got a question for the group.

 

Having done a lot of work with 94 GHz, I realize just how much fun it is to

align a millimeter system for best performance.   Both focus and

sighting.

 

The plan is to modulate one of the boards with 1000 Hz AM and test on

the antenna range.  Now the HP415 detector can be connected to the 145 MHz

port and dB's directly read.   And a relatively close object to align the sights on.

 

Would AM modulation be as simple as connecting a function generator

(or 555 timer) directly to the I Q inputs and hit both with the 1000 Hz in

phase?    I would expect slightly more output that way vs just the I or Q port.

going logic level high.

 

Kent  G8EMY

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
-- 
Neil
<a href="http://g4dbn.uk/"><small>g4dbn.uk</small></a>


Re: 122GHz antennas

Neil Smith G4DBN
 

Sadly, there are no I/Q inputs on the 122 chips, but there is a transmit enable.  I don't see any reference to whether that has a Schmitt trigger response or if it is at least slightly analogue and could be used for modulation, with some sort of inverse response curve in a DAC or something?  Even if it has hysteresis, could it be used for an on-off tone modulation?  Could it perhaps be used with pulse width modulation?

Neil G4DBN


From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of KENT BRITAIN
Sent: 19 November 2019 02:52
To: UKMicrowaves@groups.io
Subject: [UKMicrowaves] 122GHz antennas

 

Got a question for the group.

 

Having done a lot of work with 94 GHz, I realize just how much fun it is to

align a millimeter system for best performance.   Both focus and

sighting.

 

The plan is to modulate one of the boards with 1000 Hz AM and test on

the antenna range.  Now the HP415 detector can be connected to the 145 MHz

port and dB's directly read.   And a relatively close object to align the sights on.

 

Would AM modulation be as simple as connecting a function generator

(or 555 timer) directly to the I Q inputs and hit both with the 1000 Hz in

phase?    I would expect slightly more output that way vs just the I or Q port.

going logic level high.

 

Kent  G8EMY

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
-- 
Neil
<a href="http://g4dbn.uk/"><small>g4dbn.uk</small></a>


Re: Before I saw it up...

Dave Cawley G4IUG
 


 
From:  Dave Cawley
Tel.  01803 833366
 
Hi Paul
 
How big is it ?  Especially diameter at maximum ?
 
Thanks
 
Dave  G4IUG


Re: Wimo 13cms aerial VSWR

alwyn.seeds1
 

Dear Conrad,

For the S331 and similar models watch e-bay carefully; I’ve so far bought two at prices ranging from £220 for an S331B to £364 for an S331D with black and white screen and internal power meter.

The S331 models with colour screens go for higher prices, but the measured data are just the same.

Test equipment dealers push for high prices, of course; but riggers hanging up their climbing boots are far more reasonable.

The battery is usually dead, so that costs an extra £80 if you want one with the internal charge monitor interface or £40 without.

Of course, you also need to buy calibration open, short and load, good to the max frequency and they will cost maybe another £150 in total for good samples.

So you’d have plenty of change from selling your ‘7300!

Regards,

Alwyn


_____________________________________________________

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: 122GHz antennas

Paul G8KFW
 

Hi Kent

 

Just noticed you are not on the list for orders for the 122 ghz project

So you may not be using a TRA - 120 - 002 devise

 

Paul


From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of KENT BRITAIN
Sent: 19 November 2019 02:52
To: UKMicrowaves@groups.io
Subject: [UKMicrowaves] 122GHz antennas

 

Got a question for the group.

 

Having done a lot of work with 94 GHz, I realize just how much fun it is to

align a millimeter system for best performance.   Both focus and

sighting.

 

The plan is to modulate one of the boards with 1000 Hz AM and test on

the antenna range.  Now the HP415 detector can be connected to the 145 MHz

port and dB's directly read.   And a relatively close object to align the sights on.

 

Would AM modulation be as simple as connecting a function generator

(or 555 timer) directly to the I Q inputs and hit both with the 1000 Hz in

phase?    I would expect slightly more output that way vs just the I or Q port.

going logic level high.

 

Kent  G8EMY

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: 122GHz antennas

Paul G8KFW
 

Hi Kent

 

The TRA -120-002  dues not have any AM modulation capabilities

And the modulation depth that is required will determine the dynamic rang of the test set up

 

So the measurement would have to be using a spectrum analyser  

this could be a possibility for the martelsham round table

 

Glad to talk more on the subject of line

 

Paul

 


From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of KENT BRITAIN
Sent: 19 November 2019 02:52
To: UKMicrowaves@groups.io
Subject: [UKMicrowaves] 122GHz antennas

 

Got a question for the group.

 

Having done a lot of work with 94 GHz, I realize just how much fun it is to

align a millimeter system for best performance.   Both focus and

sighting.

 

The plan is to modulate one of the boards with 1000 Hz AM and test on

the antenna range.  Now the HP415 detector can be connected to the 145 MHz

port and dB's directly read.   And a relatively close object to align the sights on.

 

Would AM modulation be as simple as connecting a function generator

(or 555 timer) directly to the I Q inputs and hit both with the 1000 Hz in

phase?    I would expect slightly more output that way vs just the I or Q port.

going logic level high.

 

Kent  G8EMY

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


Before I saw it up...

Paul M0EYT
 

Hi all,

My MRS has politely asked me to get rid of my SCOT antenna that I've had for a few years. It has a 3 axis steerable dish inside, az/el/roll and the antenna is 1.2M (from memory). It was originally on a ship for Skynet 3/4 comms, before the refits for the currently Skynet 5 satellites, 7.9-8.4GHz up, 7.25-7.75GHz down. My original plan for this antenna was to do automated spectrum monitoring of X-Band milsats, so the spectrum could be rendered as a picture and uploaded to my web site.

So, before I chop it up for disposal, is there anyone on the list that can make use of it?



The antenna is located at my QTH in IO80 (Dorset). If interested, there are a few more pictures at http://pjmarsh.co.uk/scot/

regards,

Paul M0EYT.


122GHz antennas

KENT BRITAIN
 

Got a question for the group.

Having done a lot of work with 94 GHz, I realize just how much fun it is to
align a millimeter system for best performance.   Both focus and
sighting.

The plan is to modulate one of the boards with 1000 Hz AM and test on
the antenna range.  Now the HP415 detector can be connected to the 145 MHz
port and dB's directly read.   And a relatively close object to align the sights on.

Would AM modulation be as simple as connecting a function generator
(or 555 timer) directly to the I Q inputs and hit both with the 1000 Hz in
phase?    I would expect slightly more output that way vs just the I or Q port.
going logic level high.

Kent  G8EMY


Re: Wimo 13cms aerial VSWR

Lou Blasco
 

Hi all,

A quick check on ebay shows later S331 available from 1300 to 3500 GBP. There are others available for much, much less but one wonders about the state of them and shipping gear around the world in case of trouble is not appealing.

Whilst not really a portable device, I've been using a TPI-1001B generator for scalar measurements to 3500MHz and I'm very pleased with the results. Of course, results depend on the quality of your coupler, cables etc.

https://rf-consultant.com/products/tpi-1001-b-signal-generator/

A great feature is the capacity to store your last used generator settings. This means you can put it at the far end of the antenna range to use as the source TX.

Just sayin'

Regards

Lou
VK3ALB




At 00:59 19/11/2019, you wrote:
Alwyn the S331 is indeed useful and unlike it's cheaper predecessor the S251,  has an acceptable frequency accuracy the S251 was 200ppm I seem to recall which is not great on 13cms. However where can you get an S331 for a few hundred pounds?

I would sell my IC-7300 to get an S331!

73

Conrad PA5Y


From: UKMicrowaves@groups.io <UKMicrowaves@groups.io> on behalf of alwyn.seeds1 via Groups.Io <a.seeds@...>
Sent: 15 November 2019 22:23
To: UK Microwaves groups.io <UKMicrowaves@groups.io>
Subject: Re: [UKMicrowaves] Wimo 13cms aerial VSWR

 
Dear All,

Yes, I have always liked the HP8753, but they are not cheap.

Although it is only a scalar analyser, the Anritsu S331 is pretty useful for aerial adjustment.

Also, its intended for use by riggers, so is compact lightweight and battery powered, so handy in the field.

A few hundred pounds on e-bay is the typical price.

Regards,

Alwyn

_____________________________________________________

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: Wimo 13cms aerial VSWR

Conrad, PA5Y
 

Alwyn the S331 is indeed useful and unlike it's cheaper predecessor the S251,  has an acceptable frequency accuracy the S251 was 200ppm I seem to recall which is not great on 13cms. However where can you get an S331 for a few hundred pounds? 

I would sell my IC-7300 to get an S331!

73

Conrad PA5Y


From: UKMicrowaves@groups.io <UKMicrowaves@groups.io> on behalf of alwyn.seeds1 via Groups.Io <a.seeds@...>
Sent: 15 November 2019 22:23
To: UK Microwaves groups.io <UKMicrowaves@groups.io>
Subject: Re: [UKMicrowaves] Wimo 13cms aerial VSWR
 
Dear All,

Yes, I have always liked the HP8753, but they are not cheap.

Although it is only a scalar analyser, the Anritsu S331 is pretty useful for aerial adjustment.

Also, it’s intended for use by riggers, so is compact lightweight and battery powered, so handy in the field.

A few hundred pounds on e-bay is the typical price.

Regards,

Alwyn

_____________________________________________________

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: Mystery coax part

Wilko
 

Ah! Thank you! This one really had me going "hm hm". Strangely enough it does not have an indication scale for its settings, nor does it have a facility to 'lock' the aluminium slide on the silvered coax tube.

Will see if I can figure out what range it has.

That said, I don't think I am ever going to use it, but prove me wrong HI

Many thanks to all that replied

73 Wilko