Date   
SSPA Metering

Timestep
 


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Internal Virus Database is out of date.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...

Timestep
 


 
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

Re: Mystery coax part

Lou Blasco
 


On Mon, Nov 18, 2019 at 9:16 AM KENT BRITAIN <WA5VJB@...> wrote:
A slide tuner!

Great at giving you a 1 to 1 SWR at a given  point/frequency.

Microwave version of the classing HF antenna tuner.

Kent


On Sunday, November 17, 2019, 3:22:33 PM CST, Wilko <wkb@...> wrote:


Last Friday I spent a couple of € at a ham rally to acquire a mystery coax part. I hope 
the gurus on this list can help identify it.



Thanks in advance!

73 Wilko
PA1WBU

Re: Mystery coax part

KENT BRITAIN
 

A slide tuner!

Great at giving you a 1 to 1 SWR at a given  point/frequency.

Microwave version of the classing HF antenna tuner.

Kent


On Sunday, November 17, 2019, 3:22:33 PM CST, Wilko <wkb@...> wrote:


Last Friday I spent a couple of € at a ham rally to acquire a mystery coax part. I hope 
the gurus on this list can help identify it.



Thanks in advance!

73 Wilko
PA1WBU

Mystery coax part

Wilko
 

Last Friday I spent a couple of € at a ham rally to acquire a mystery coax part. I hope 
the gurus on this list can help identify it.



Thanks in advance!

73 Wilko
PA1WBU

Re: Activity List for the UK Microwave Group Low Band Contest - Sunday 17th November

Neil Smith G4DBN
 

Hi Ben, there isn’t really a specific frequency these days. 10368.100 is popular, but stations seem to spread out from .090 to .220
In these times of SDRs and waterfalls, even during rain scatter events, a calling frequency isn’t really useful any more. Stations tend to pick a working frequency and stick to it.
I know who will be on .090 and .110 and .150 and .200, which helps when I am trying to dig out random contacts without KST.
Neil G4DBN

On 17 Nov 2019, at 09:45, militaryoperator via Groups.Io <Military1944@...> wrote:

What's the normal calling freq on 10GHz?

Ben.


_._

Re: Activity List for the UK Microwave Group Low Band Contest - Sunday 17th November

militaryoperator
 

What's the normal calling freq on 10GHz?

Ben.


Re: Wimo 13cms yagi

alwyn.seeds1
 

Dear John,

The 18GHz N-types- non-slotted outers- depend critically on uniform contact between the front of the outer on the plug and the step in the socket.

If contact is incomplete, suck-outs result as with your load. 18GHz plugs usually have flats to enable them to be torqued correctly- 1.5 N.m

For general use at frequencies up to 11 GHz I prefer the slotted outers, as they engage against the sides of the socket outer and torque is less critical.

7/16 DIN connectors require contact as the 18GHz N types and this requires very considerable torque- 25 N.m.

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: Activity List for the UK Microwave Group Low Band Contest - Sunday 17th November

Barry Lewis
 

Sorry to hear Ralph,
We'll miss you from Walbury Hill.
Look forward to catching you again next year!
GL 73
Barry G4SJH as M0HNA/P

Activity List for the UK Microwave Group Low Band Contest - Sunday 17th November - Addendum

John Quarmby
 

I apologise for omitting one entrant from the list -  now added.

Thanks for all your inputs for the activity list for tomorrow's UKuG Low Band Contest which takes place from from 1000-1400 GMT, on the 1296, 2300, 2320 and 3400MHz bands.

Rules are here: http://microwave.rsgbcc.org/cgi-bin/contest_rules.pl?year=2019&contest=lb_contestNov


The weather forecast looks fairly benign for the time of year, with light winds predicted. Sadly no tropo though. Here's the activity list:

Callsign: G3UVR
Locator: IO83KH89
Bands:  1.3GHz 90W 1 x 23 ele Tonna
             2,32GHz 100W 1 x 25 ele Tonna
             3.4GHz Maybe next year
Times: Various throughout
Talkback: ON4KST Primary,. CQ's and S+P,. Zello SHF Chat if all else fails.

Callsign: G1PPA/P
Locator: IO93RI
Bands 1.3ghz 10w 44 ele wimo
Time: from start and see how it goes (weather permitting)
Talkback: Will be on kst

Callsign: G8DOH
Locator: IO92FA
Bands: 1.3GHz 125W 2 x 23 el
Times: Various throughout
Talkback: ON4KST, CQ on 1.3GHz

Callsign: M0HNA/P
Locator: IO91GI44
Bands: 1.3GHz 250W 67ele
2.3GHz 60W 0.9m dish
3.4GHz 15W 1.1m dish
Talkback: ON4KST, (23cm M0HNA-1, 9&13cm M0HNA-2) plus direct CQ on 23cm.
Times: Throughout the event

Callsign:  PA0P
Locator:  JO22EB
Band :     1.3GHz  150W 39 el Yagi
Times:     Throughout
Talkback: ON4KST , direct CQ

Callsign: G8GTZ/P
Locator: IO91JH
Bands: 2.3GHz 2W 25 ele yagi
            3.4GHz 15W .8m dish
Talkback: ON4KST, 144.390
Times: From 11am

Callsign: G8JVM
Locator: IO82SP
Bands: 1.3GHz 100W 70ele
       2.32GHz 100W 40ele
Times: Various throughout
Talkback: CQ on 1.3GHz, Zello SHF Chat

Callsign: G4CIO
Locator: IO81UQ (230 m ASL)
Bands:  1.3GHz 10 W
Times: Various
Talkback: ON4KST, maybe Zello

Call: G4ZTR
Locator: JO01KW
Bands: 1.3GHz 300w 2m dish
2.32GHz ~8w 2m dish
Times: throughout
Talkback: ON4KST

Callsign: G3YJR
Locator: IO93FJ
Bands: 1.3GHz 8W 33 el Wimo
              2.32GHz 25W 40 el Wimo
Times: Various throughout
Talkback: ON4KST

Callsign: GD8EXI
Locator: IO74PC
Bands:
1.3GHz 400 watts 60 ele Yagi
Times: Only first 2 hours unless conditions are very good.
Talkback: CQ and KST.

Callsign: GW4MBS
Locator: IO71XW
Bands: 1.3GHz 200 watts 35-el Yagi
Times: Most of time other than tea breaks
Talkback: KST2ME or email

Callsign: G3XDY
Locator: JO02OB
Bands: 1.3GHz 400W 4 x 23 el
              2.30/2.32GHz 200W 0.8m dish
             3.4GHz 20W 0.8m dish
Times: Various throughout
Talkback: ON4KST, CQ on 1.3GHz, Zello SHF Chat

73

John G3XDY
UKuG Contest Manager