Date   

Re: IS IT JUST ME

John McCarthy
 

As someone who goes out portable it is hard work, as others have said 2mtrs is becoming almost pointless as the amount of power it requires to work the same distances I manage on 3cm is just too much. Battery life is a key factor in all this, if you want to last any amount of time on air it all has to be thought about. So I don't bother with hi power on 2mtrs I mainly use KST or more increasingly mobile phone. Maybe a whatsapp type group is needed ? As I do agree KST can be a bit tedious at times, especially when it's busy. One other thing I enjoy going out portable and I think that's a key factor in what ever way we go, keep it enjoyable don't make it to hard work 😁

All best John G7JTT


On Mon, 28 Aug 2017 at 10:49, John Fell john.g0api@... [ukmicrowaves]
wrote:
 

I gave up on running my masthead 10GHZ  20W TWT system over 10 years ago for all the previous reasons .

I called for one way ,1/2 point ,  contacts a couple of times during the afternoon yesterday , when several were calling CQ for 10G and had no replies .

I live on what passes for a good take off in this area (IO80) and regularly log several beacons , so I know my system capabilities .

Surely even 1/2 points over 200 + km would be worth the effort , when activity has gone a bit slack ?

Maybe we should just register a uwavers phone data base and use that for skeds - yes , I know it can be  abused , but anyone in that frame of mind will soon become visible and I doubt they are amongst this group.

73
John
G0API


Re: IS IT JUST ME

John Fell
 

I gave up on running my masthead 10GHZ  20W TWT system over 10 years ago for all the previous reasons .

I called for one way ,1/2 point ,  contacts a couple of times during the afternoon yesterday , when several were calling CQ for 10G and had no replies .

I live on what passes for a good take off in this area (IO80) and regularly log several beacons , so I know my system capabilities .

Surely even 1/2 points over 200 + km would be worth the effort , when activity has gone a bit slack ?

Maybe we should just register a uwavers phone data base and use that for skeds - yes , I know it can be  abused , but anyone in that frame of mind will soon become visible and I doubt they are amongst this group.

73
John
G0API


Re: IS IT JUST ME

Nick Peckett G4KUX
 

I will agree with David that conditions were down today, certainly when compared to last months session, although the WX was better for the /P stations.
 
I don't use KST2ME and prefer the traditional KST set up which I’ve used for years, and very comfortable with.
 
Living in a good tropo QTH I find that 144175 is practically useless, in fact the odd time I have used it to set up contacts I usually find the stations concerned are better copy on 3cms than 2M, generally because they are at 250-300k and using 10W to a 3-9ele ant, and this just doesn't cut the mustard over these distances, add to that the increasingly noisy environment that is what the 2M band is becoming today and you have some of the reasons that .175 is not working. It was originally adopted in the days of WBFM where contacts of 100klmish generally were generally the order of the day, but in these days on 3cms where virtually everyone has NB SSB/CW and a few Watts of power, the ranges of 3Cms contacts has vastly increased to the point where 2M from a small set up just isn't adequate over the distances involved.
 
While KST might have it’s problems, it’s the best vehicle available for setting up contacts and I cant see any alternative at the moment.
 
Nick G4KUX
 

From: g4asr@... [ukmicrowaves]
Sent: Sunday, August 27, 2017 10:00 PM
To: ukmicrowaves@...
Subject: Re: [ukmicrowaves] IS IT JUST ME
 
 

Well here I heard a fair bit of traffic on 144.175 from IO93 down to IO80 and across to IO91. 

Indeed stations needed to move to 185 to avoid causing qrm.
You do need a 'proper' aerial of course. 
 
I always find 'KST irritating with stations asking for skeds and then disappearing to work someone else.
 
I found conditions very poor on 3cm,, stations that I can normally work, like G3XDY (JO02) or G4KUX (IO94),
were virtually inaudible. It just seemed like firing into a wet blanket.  Only 14 QSO's in 8 squares.
 
73 David G4ASR
 
IO81MX 

Virus-free. www.avg.com


Re: IS IT JUST ME

DAVID G4ASR
 

Well here I heard a fair bit of traffic on 144.175 from IO93 down to IO80 and across to IO91. 
Indeed stations needed to move to 185 to avoid causing qrm. 
You do need a 'proper' aerial of course.  

I always find 'KST irritating with stations asking for skeds and then disappearing to work someone else.

I found conditions very poor on 3cm,, stations that I can normally work, like G3XDY (JO02) or G4KUX (IO94),
were virtually inaudible. It just seemed like firing into a wet blanket.  Only 14 QSO's in 8 squares.

73 David G4ASR

IO81MX  


Re: IS IT JUST ME

Ed G3VPF
 

I used KST2ME, but had great difficulty seeing the screen in bright sunlight. I also had trouble attracting attention. To get it working at all I wasted a significant amount of time moving the mobile phone aerial around to get any sort of internet connection. I had 2m, but only by time-sharing the rig with the microwave i/f. I too heard no-one on 144.175. Can anyone confirm which aerial polarisation is generally used? Vertical is the easiest but I guess most will be on horizontal.

Recently I have used text messages with some success.

There does not appear to be an easy answer to this problem so I guess we will each sit on our preferred talkback method.

Ed G3VPF


On Sunday, 27 August 2017, 21:14, "Adrian whatmore g4uvz@... [ukmicrowaves]" wrote:


 
I was using KSTME but is was still of little use today


On Sunday, 27 August 2017, 21:04, "Andy Talbot andy.g4jnt@... [ukmicrowaves]" wrote:


 
Well, I finally managed to master KST2ME and once you've set it up with the sounds and things, and follow the rules it becomes useful - which is more than can be said for the main KST itself.

In a /P environment, it might actually be persuaded to work provided the Inet connection keeps-up

But couldn't believe how quiet 144175 was

6 stations on 5760 from home.

Andy  'jnt


On 27 August 2017 at 20:53, g4uvz@... [ukmicrowaves] <ukmicrowaves@...> wrote:
 
Well I was all ready for a great day working all the stations on the 10GHz contest!
As Andy has said  .175 was very quiet but there were many stations on KST..mostly French.
Operating from home I had a good internet connection but try as I might, I had great difficulty getting contacts.
Stations called looking for contacts   called them on the keys...no Go.
Last contest I worked a dozen stations ..mostly set up on 2M but quite a few direct on 10G
Today I worked 3 stations   two of which were set up on 2M

It seems to me that /P stations probably can't see the wood for the trees   maybe we need a dedicated KST type system for inter G contacts?









Re: IS IT JUST ME

Adrian whatmore <g4uvz@...>
 

I was using KSTME but is was still of little use today


On Sunday, 27 August 2017, 21:04, "Andy Talbot andy.g4jnt@... [ukmicrowaves]" wrote:


 
Well, I finally managed to master KST2ME and once you've set it up with the sounds and things, and follow the rules it becomes useful - which is more than can be said for the main KST itself.

In a /P environment, it might actually be persuaded to work provided the Inet connection keeps-up

But couldn't believe how quiet 144175 was

6 stations on 5760 from home.

Andy  'jnt


On 27 August 2017 at 20:53, g4uvz@... [ukmicrowaves] <ukmicrowaves@...> wrote:
 
Well I was all ready for a great day working all the stations on the 10GHz contest!
As Andy has said  .175 was very quiet but there were many stations on KST..mostly French.
Operating from home I had a good internet connection but try as I might, I had great difficulty getting contacts.
Stations called looking for contacts   called them on the keys...no Go.
Last contest I worked a dozen stations ..mostly set up on 2M but quite a few direct on 10G
Today I worked 3 stations   two of which were set up on 2M

It seems to me that /P stations probably can't see the wood for the trees   maybe we need a dedicated KST type system for inter G contacts?







Re: IS IT JUST ME

Andy G4JNT
 

Well, I finally managed to master KST2ME and once you've set it up with the sounds and things, and follow the rules it becomes useful - which is more than can be said for the main KST itself.

In a /P environment, it might actually be persuaded to work provided the Inet connection keeps-up

But couldn't believe how quiet 144175 was

6 stations on 5760 from home.

Andy  'jnt


On 27 August 2017 at 20:53, g4uvz@... [ukmicrowaves] <ukmicrowaves@...> wrote:
 

Well I was all ready for a great day working all the stations on the 10GHz contest!

As Andy has said  .175 was very quiet but there were many stations on KST..mostly French.

Operating from home I had a good internet connection but try as I might, I had great difficulty getting contacts.

Stations called looking for contacts   called them on the keys...no Go.

Last contest I worked a dozen stations ..mostly set up on 2M but quite a few direct on 10G

Today I worked 3 stations   two of which were set up on 2M


It seems to me that /P stations probably can't see the wood for the trees   maybe we need a dedicated KST type system for inter G contacts?






IS IT JUST ME

g4uvz@...
 

Well I was all ready for a great day working all the stations on the 10GHz contest!

As Andy has said  .175 was very quiet but there were many stations on KST..mostly French.

Operating from home I had a good internet connection but try as I might, I had great difficulty getting contacts.

Stations called looking for contacts   called them on the keys...no Go.

Last contest I worked a dozen stations ..mostly set up on 2M but quite a few direct on 10G

Today I worked 3 stations   two of which were set up on 2M


It seems to me that /P stations probably can't see the wood for the trees   maybe we need a dedicated KST type system for inter G contacts?





Re: ADF5355 Signal Source

Mary Echternacht <scootiebug02@...>
 

Thank you, I just bought one of his boards. 73 AC0PY Richard



From: 'Bob VK6KW' rlockley@... [ukmicrowaves]
To: "ukmicrowaves@..."
Sent: ‎Saturday‎, ‎August‎ ‎26‎, ‎2017‎ ‎02‎:‎32‎:‎30‎ ‎PM‎ ‎EDT
Subject: RE: [ukmicrowaves] ADF5355 Signal Source

 

Hi Richard,

Try:

https://zl2bkc.com/store/

 

73,

Bob VK6KW

 

From: ukmicrowaves@... [mailto:ukmicrowaves@...]
Sent: Friday, August 25, 2017 6:17 AM
To: DougF uwaves@... [ukmicrowaves]
Subject: Re: [ukmicrowaves] ADF5355 Signal Source

 

 

Can anyone give me the email address for Wayne? AC0PY Richard USA

 

 

On ‎Thursday‎, ‎August‎ ‎24‎, ‎2017‎ ‎03‎:‎19‎:‎48‎ ‎PM‎ ‎EDT, DougF uwaves@... [ukmicrowaves] <ukmicrowaves@...> wrote:

 

 

 

Greetings to all readers!

Many folk will have become familiar in recent years with the 'ZLPLL'
4GHz PLL board designed and sold by Wayne, ZL2BKC.  They are rather
good.....provided, of course, that the reference signal is clean.

Well, Wayne has also been on the scent of the ADF5355 trail and has
produced his first (small) batch of what he now calls the '13G ZLPLL'. 
Different to the earlier edition, the new design requires an off-board
reference, but like the earlier version it's fully programmable and it
works well way up past 13 GHz.  For a digitally generated microwave PLL
at these sorts of frequencies, its PN seems

To generate a 13+ GHz output signal the chip uses a doubler that's
internal to the chip so the PLL 'fundamental' is also present in the
output spectrum, the desired output needing filtering if the F/2
component is a problem.

I have one of Wayne's early batch of 13G ZLPLLs here with me in the UK
and I propose, for possible comparison purposes, to have it with me at
the Crawley RT next month.  Or I may be able to show it off to some
other folk between now and then.....  (I do also have with me a very
good quality 10 MHz OCXO that is appropriately interfaced to the 13G
ZLPLL, so it can be a plug-and-play comparison.)

It should be interesting to compare the output signal from Wayne's
design, one that uses a reliably genuine chip set, with the Chinese ones
that some folk are obviously acquiring!

Cheers and 73,

--Doug Friend, M/VK4OE


Looks like 144.175 really has died

Andy G4JNT
 

I may not have much of an antenna (2 element ) but to hear NOTHING on 144.175MHz for uWave talkback really does seem a bit poor  

Still, KST2ME all seems to work, so ...

'jnt


Re: Activity list for the UK Microwave Group 5.7GHz and 10GHz contests - Sunday 27th August

G1DFL
 


And another late entry:

Pete G1DFL/P
IO91NM Remenham Hill (Good to the South and SW)
10GHz 0.2W 60cm Dish
144.175MHz SSB, KST, 07713 432632
Planning for 2pm to 3.30pm
Also 24G



On Sunday, August 27, 2017 9:43 AM, "'g7jtt@...' g7jtt@... [ukmicrowaves]" wrote:


 
Sorry very late entry 
G7JTT
IO90LX53
2W 3cm sky dish
2mtr or 07762112271 talkback


On Sat, 26 Aug 2017 at 18:44, Andy Talbot andy.g4jnt@... [ukmicrowaves]
wrote:
 
5.7GHz and 10GHz contests - Sunday 27th August

G4JNT    Home station  IO90IV58  5760MHz only
On from the morning,  Around 0900z onwards
KST and will have a small beam up for 144.175MHz

8W 23dBi flat plate  (but via 12m of LDF-450)

'jnt

On 21 August 2017 at 09:36, G3XDY g3xdy@... [ukmicrowaves] <ukmicrowaves@...> wrote:
 
The next in the series of UKuG 5.7GHz and 10GHz Contests takes place
this coming Sunday 27th August, between 0600-1800GMT (0700-1900 BST).
Entrants can choose any 8 hour slot in one or two sessions between those
times. Full rules are here:

http://microwavers.org/files/ 2017-mwrules.pdf

The earlier part of this event coincides with the French F8TD contest
which includes both bands and runs to 1300 GMT.

I will compile an activity list and send it out next Saturday morning,
so inputs by Friday night please, in the usual format:


.



altVirus-free. www.avg.com



Re: Activity list for the UK Microwave Group 5.7GHz and 10GHz contests - Sunday 27th August

John McCarthy
 

Sorry very late entry 
G7JTT
IO90LX53
2W 3cm sky dish
2mtr or 07762112271 talkback


On Sat, 26 Aug 2017 at 18:44, Andy Talbot andy.g4jnt@... [ukmicrowaves]
wrote:
 

5.7GHz and 10GHz contests - Sunday 27th August

G4JNT    Home station  IO90IV58  5760MHz only
On from the morning,  Around 0900z onwards
KST and will have a small beam up for 144.175MHz

8W 23dBi flat plate  (but via 12m of LDF-450)

'jnt

On 21 August 2017 at 09:36, G3XDY g3xdy@... [ukmicrowaves] <ukmicrowaves@...> wrote:
 

The next in the series of UKuG 5.7GHz and 10GHz Contests takes place
this coming Sunday 27th August, between 0600-1800GMT (0700-1900 BST).
Entrants can choose any 8 hour slot in one or two sessions between those
times. Full rules are here:

http://microwavers.org/files/ 2017-mwrules.pdf

The earlier part of this event coincides with the French F8TD contest
which includes both bands and runs to 1300 GMT.

I will compile an activity list and send it out next Saturday morning,
so inputs by Friday night please, in the usual format:


.



altVirus-free. www.avg.com


Re: Calibrating an RF detector

Mike Willis
 

Hi Terry,

I have of of those and also one of the OLED versions. I calibrated it against a signal generator which I believe is fairly accurate. It was within 2dB and much better in relative accuracy rather than absolute accuracy, i.e. measuring changes in power, so for example very useful to determine an amplifiers 1 dB compression point. You said you don't have one of those but they are often made available for testing at microwave round tables, as are good quality power meters that you can compare against. The next RT near you can be determined from the UKUG website. There may also be a local amateur with the right gear that can help.

Bear in mind that these chips have some thermal drift so you also need to calibrate against temperature. In practice, they are not really for accurate metrology but as very useful when used with a directional coupler to verify the TX is more or less working.

Mike 


Scottish Microwave Round Table 4th November 2017

Brian Flynn GM8BJF
 

The  website is now open for bookings. It is at

http://www.gmroundtable.org.uk/

To book a place follow the link in the right hand side bar "Links to forms" and it will take you to the booking page. The bookings for the daytime events  and the dinner are separate. The programme follows the tried and tested format of previous years. There are four main talks, the bring and buy/trade tables, the test and measurement facilities and of course the Museum of Communication exhibits. The speakers are:
  • Mark Hughes GM4ISM - "A 10 GHz Home Station"
  • Geoff Pike GI0GDP - "Replacement LO options for the DB6NT G2 Transverters"
  • David Anderson GM6BIG  - "A High Quality 10GHz Beacon"
  • Andy Sinclair MM0FMF and Jack Hood GM4COX - "13cm SOTA"

In the evening there will be the dinner in the Kingswood Hotel about one mile east of Burntisland with the usual entertainments, (the Microwave Band!).


Look forward to seeing you there.


73s


Brian Flynn GM8BJF





Re: ADF5355 Signal Source

Bob Lockley VK6KW
 

Hi Richard,

Try:

https://zl2bkc.com/store/

 

73,

Bob VK6KW

 

From: ukmicrowaves@... [mailto:ukmicrowaves@...]
Sent: Friday, August 25, 2017 6:17 AM
To: DougF uwaves@... [ukmicrowaves]
Subject: Re: [ukmicrowaves] ADF5355 Signal Source

 

 

Can anyone give me the email address for Wayne? AC0PY Richard USA

 

 

On ‎Thursday‎, ‎August‎ ‎24‎, ‎2017‎ ‎03‎:‎19‎:‎48‎ ‎PM‎ ‎EDT, DougF uwaves@... [ukmicrowaves] <ukmicrowaves@...> wrote:

 

 

 

Greetings to all readers!

Many folk will have become familiar in recent years with the 'ZLPLL'
4GHz PLL board designed and sold by Wayne, ZL2BKC.  They are rather
good.....provided, of course, that the reference signal is clean.

Well, Wayne has also been on the scent of the ADF5355 trail and has
produced his first (small) batch of what he now calls the '13G ZLPLL'. 
Different to the earlier edition, the new design requires an off-board
reference, but like the earlier version it's fully programmable and it
works well way up past 13 GHz.  For a digitally generated microwave PLL
at these sorts of frequencies, its PN seems

To generate a 13+ GHz output signal the chip uses a doubler that's
internal to the chip so the PLL 'fundamental' is also present in the
output spectrum, the desired output needing filtering if the F/2
component is a problem.

I have one of Wayne's early batch of 13G ZLPLLs here with me in the UK
and I propose, for possible comparison purposes, to have it with me at
the Crawley RT next month.  Or I may be able to show it off to some
other folk between now and then.....  (I do also have with me a very
good quality 10 MHz OCXO that is appropriately interfaced to the 13G
ZLPLL, so it can be a plug-and-play comparison.)

It should be interesting to compare the output signal from Wayne's
design, one that uses a reliably genuine chip set, with the Chinese ones
that some folk are obviously acquiring!

Cheers and 73,

--Doug Friend, M/VK4OE


Re: Calibrating an RF detector

geoff Blake
 

First, you need to decide exactly how accurate you need to calibrate the sensor. RF power is notably fickle in this aspect. All but the best, most well equipped calibration labs are hard put to measure much better than +/- 5% over the range you speak of. Before other folk raise their pens to criticise me, at certain spot frequencies better figures are attainable.  In amateur circles I cannot see that any better than +/- 10% is necessary. Of course your amateur SWR/power meter will be much better than this :-)

OK, to sensibly and reasonably accurately calibrate a RF power sensor, you need to:

1) check the RF sensitivity of the device, i.e. RF in to outputted reading. This is the primary step and is best done at 0dB or 1mW. This is probably best done with the 1mW 50MHz reference fitted on many HP and other power meters. This power meter should have been recently calibrated - the specified power drift of the reference source is 0.7%/yr IIRC.

2) check the return loss of the sensor. Obviously, any reflected power is going to reduce the readout and make the sensor read low. This needs to be done at several frequencies over the range.

3) look at the linearity of the sensor, i.e. if you reduce the power by 10dB, the output reading should reduce by 10dB.

4) Check the noise floor of the sensor, i would expect this to be about -60dBm and would increase the error at -50dB by about 10% or so.

In practice, and in an amateur world, I would choose Francois's option first, although I would go easy on the good beer, at least until the measurements are all finished :-)

Andy's proposal, just to use the spec. sheet figures, would probably produce significantly better results that those of a typical SWR/power meter or dare I say it, a Bird model 43 system.

Good luck

Geoff G8GNZ

#################################################
Geoff Blake,   G8GNZ    JO01fq:   Chelmsford,  Essex,  UK
<geoff@...>    or   <melecerties@...>
Using Linux: Ubuntu 14.04 on Intel or Debian on UltraSparc
    and  Apple  OS  X  El Capitan  on  my  Macbook  Pro.    
                Avoiding Micro$oft like the plague.
#################################################

On 26 August 2017 at 15:54, Andy Talbot andy.g4jnt@... [ukmicrowaves] <ukmicrowaves@...> wrote:


First of all, download the datasheet for the AD8317 and study that to see what you've got

As the evaluation board you have "probably" has no additional DC conditioning on the output or RF gain or attenuation,  until you can prove otherwise, it'll probably do what it says in the datasheet in terms of Vout vs Pin

'jnt


On 26 August 2017 at 15:50, terry.bailey@... [ukmicrowaves] <ukmicrowaves@...> wrote:
 

Hi all, I have one of these

http://www.ebay.co.uk/itm/AD8317-1MHz-to-10GHz-RF-Power-Meter-Logarithmic-Detector-Controller-f-Amplifier-/172248001491?hash=item281ac7ebd3:g:SSoAAOSwM4xXZ9NN

I it works fine but I don't have any idea how to calibrate the readings I am getting from it. I don't have a reference source. I do have a spectrum analyser which is good to 10GHz, but it is totally uncalibrated and somewhat temperamental.

Can anyone point me in the right direction?

Cheers

Terry







Re: Calibrating an RF detector

Andy G4JNT
 

Feedback and PIN attenuators are fine, but how do you calibrate your 1mW in the first place?

You need an accurate power level or meter to compare with.

CMAS gates can work OK ish.   Use AC series gate which at 50Mhz will be giving a reasonable squarewave its ouptut resistance is about 10 ohms so use 39R reistor and connect to 50R load.  You now have a 2.5pk-pk square across your 50R load, that is delivering 

At the fundamental that is 2.5 * 4/pi = 3.2V pk-pk or 25mW = 14dBm
Use resistors / attenuators appropriately.

But remember that level is at the fundamental only.  If unfiltered, harmonic components will add.

'jnt


On 26 August 2017 at 17:58, GORDONJ REASON gordonj.reason@... [ukmicrowaves] <ukmicrowaves@...> wrote:
 

to give me a 0dBm , (1 mW ) source at 50 Mhz ..............

I use a Xtal oscillator ........ and buffer .......... followed by a single , +V ,  pin diode attenuatror .

the rf output is rectified with a shottky diode .

That DC is fed to one input of an opamp .

The other input is a DC reference from a TL431 .

The output + feeds back to the PIN Diode attenuator , via a small resistor , and the opamp has a multiturn pot in the feedback path ..... 

Works like a charm ...... 

It's not inmportant to use a Crystal osc .......... the frequency is your choice .....

On 26 August 2017 at 15:54 "Andy Talbot andy.g4jnt@... [ukmicrowaves]" <ukmicrowaves@...> wrote:

 

 

First of all, download the datasheet for the AD8317 and study that to see what you've got

As the evaluation board you have "probably" has no additional DC conditioning on the output or RF gain or attenuation,  until you can prove otherwise, it'll probably do what it says in the datasheet in terms of Vout vs Pin

'jnt


On 26 August 2017 at 15:50, terry.bailey@... [ukmicrowaves] <ukmicrowaves@...> wrote:
 

 

Hi all, I have one of these

http://www.ebay.co.uk/itm/AD8317-1MHz-to-10GHz-RF-Power-Meter-Logarithmic-Detector-Controller-f-Amplifier-/172248001491?hash=item281ac7ebd3:g:SSoAAOSwM4xXZ9NN

I it works fine but I don't have any idea how to calibrate the readings I am getting from it. I don't have a reference source. I do have a spectrum analyser which is good to 10GHz, but it is totally uncalibrated and somewhat temperamental.

Can anyone point me in the right direction?

Cheers

Terry


 

 

 


 


 



Re: Calibrating an RF detector

GORDONJ REASON <gordonj.reason@...>
 

to give me a 0dBm , (1 mW ) source at 50 Mhz ..............

I use a Xtal oscillator ........ and buffer .......... followed by a single , +V ,  pin diode attenuatror .

the rf output is rectified with a shottky diode .

That DC is fed to one input of an opamp .

The other input is a DC reference from a TL431 .

The output + feeds back to the PIN Diode attenuator , via a small resistor , and the opamp has a multiturn pot in the feedback path ..... 

Works like a charm ...... 

It's not inmportant to use a Crystal osc .......... the frequency is your choice .....

On 26 August 2017 at 15:54 "Andy Talbot andy.g4jnt@... [ukmicrowaves]" <ukmicrowaves@...> wrote:

 

 

First of all, download the datasheet for the AD8317 and study that to see what you've got

As the evaluation board you have "probably" has no additional DC conditioning on the output or RF gain or attenuation,  until you can prove otherwise, it'll probably do what it says in the datasheet in terms of Vout vs Pin

'jnt


On 26 August 2017 at 15:50, terry.bailey@... [ukmicrowaves] <ukmicrowaves@...> wrote:
 

 

Hi all, I have one of these

http://www.ebay.co.uk/itm/AD8317-1MHz-to-10GHz-RF-Power-Meter-Logarithmic-Detector-Controller-f-Amplifier-/172248001491?hash=item281ac7ebd3:g:SSoAAOSwM4xXZ9NN

I it works fine but I don't have any idea how to calibrate the readings I am getting from it. I don't have a reference source. I do have a spectrum analyser which is good to 10GHz, but it is totally uncalibrated and somewhat temperamental.

Can anyone point me in the right direction?

Cheers

Terry


 

 

 


 


 


Réf. : Re: Calibrating an RF detector

F1CHF
 

Why not use the services of a well-equipped neighbor?
In addition to drinking a good beer!
In addition to drinking a good beer!
Francois F1CHF
 
 
 
 
-------Message original-------
 
Date : 26/08/2017 18:58:10
Sujet : Re: [ukmicrowaves] Calibrating an RF detector
 
 

to give me a 0dBm , (1 mW ) source at 50 Mhz ..............

I use a Xtal oscillator ........ and buffer .......... followed by a single , +V ,  pin diode attenuatror .

the rf output is rectified with a shottky diode .

That DC is fed to one input of an opamp .

The other input is a DC reference from a TL431 .

The output + feeds back to the PIN Diode attenuator , via a small resistor , and the opamp has a multiturn pot in the feedback path ..... 

Works like a charm ...... 

It's not inmportant to use a Crystal osc .......... the frequency is your choice .....

On 26 August 2017 at 15:54 "Andy Talbot andy.g4jnt@... [ukmicrowaves]" wrote:

 

 

First of all, download the datasheet for the AD8317 and study that to see what you've got

As the eva luation board you have "probably" has no additional DC conditioning on the output or RF gain or attenuation,  until you can prove otherwise, it'll probably do what it says in the datasheet in terms of Vout vs Pin

'jnt


On 26 August 2017 at 15:50, terry.bailey@... [ukmicrowaves] <ukmicrowaves@...> wrote:
 

 

Hi all, I have one of these

http://www.ebay.co.uk/itm/AD8317-1MHz-to-10GHz-RF-Power-Meter-Logarithmic-Detector-Controller-f-Amplifier-/172248001491?hash=item281ac7ebd3:g:SSoAAOSwM4xXZ9NN

I it works fine but I don't have any idea how to calibrate the readings I am getting from it. I don't have a reference source. I do have a spectrum analyser which is good to 10GHz, but it is totally uncalibrated and somewhat temperamental.

Can anyone point me in the right direction?

Cheers

Terry


 

 

 


 


 

 


Re: TF2600B

g4bao
 

Sorry Ed. I missed the 'B' Need to engage brain before  typing !

73 John 

On 26 Aug 2017 08:49, "Edward Harland g3vpf@... [ukmicrowaves]" <ukmicrowaves@...> wrote:
 

John


Sorry but as I said in the message there are a number of hits for the TF2600 but I have the TF2600B which is the later model and a very different beast.

Ed G3VPF


On Fri, 25 Aug 2017 at 22:30, g4bao john@... [ukmicrowaves]
 
[Attachment(s) from g4bao included below]

Took me about 2 minutes to find with Google.

Enjoy!

73
John


On 25 August 2017 at 20:52, Edward Harland g3vpf@... [ukmicrowaves] <ukmicrowaves@...> wrote:
 

Folks

My prehistoric Marconi Instruments TF2600B video millivoltmeter has failed after ~45 years service. I use this for setting up wideband IF's and have not found a modern alternative. Does anyone have a circuit diagram/service manual I could beg, borrow or purchase?

An internet search provides a number of hits for the older TF2600 valve millivoltmeter but this is the later transistorised unit.

Ed G3VPF