Date   
Re: Windows (More)

ad7jt <ad7jt@...>
 

Hi Garey,

 

I think 5V at +10 dBm and 10 MHz is too high.  Also, I prefer to calibrate with 1 MHz which should be the  maximum output from the DDS-60 over the range we are interested in.  With everything calibrated at the maximum DDS-60 output point, you can use curve fitting to compensate for the decreasing power levels at higher frequencies.  This give you maximum range coverage and will avoid going over the maximum voltage rating on the NANO ADC input pin (Vcc +/- 0.5V).

 

Try this:

1.       set the adjust the DDS-60 output (R8) until the AD8307 output pin (pin 4) reads 2.1V which should be the AD8307 output level with 0.0 dBm input. 

2.       Using the nominal slope-intercept values, adjust the RF Power Meter output level (R10) until the power level reads 0.0 dBm.

3.       Run the slope-intercept procedure. 

4.       If the new values are significantly different that the nominal, set them to the new values repeat steps 2, 3 and 4.

 

Then check the results with your HP 606. 

 

 

73,

Dave Collins – AD7JT

 

P.S.  Your new dsPIC is in the mail.  Please send the old one back to me so I can try to find out what happened to it.

 

 

From: PHSNA@... [mailto:PHSNA@...]
Sent: Monday, October 27, 2014 2:20 PM
To: PHSNA@...
Subject: Re: [PHSNA] Windows (More)

 

 


I have a couple more problems..... Yay... :-)

Using the 8307 power meter and DD60/Nano.

1. The meter is calibrated at 10 MHz using HP 606 attenuator topping at +10 DBM for 5.00 VDC.

2. The win app reads output of the DDS-60/Nano as 12.13 dB, even though meter reads +10 dBm. I
suspect this error is due to my inability to set the slope calibration. I'm getting wide
variations in the 'count' reading during the Calibration routine. The counts vary by 100's, and
if I keep returning the Cal, after about three or four different readings it seems to settle.
At 0 dBm, I'm getting 918 counts, eventually. But I can reduce to -10, the meter drops 10 dB but
the count remains the same! The DC voltage from the power meter is rock solid, and the meter
"meter" shows the expected 10 dB steps as the attenuator is reduced. That reading is also rock
solid. The Aref reference 5.00 volts is also solid. So.... is it possible for this variable
readout to be caused by the Nano, internally?

I guess I need to swap the Nano, and I have a 'spare' somewhere, but I can't find it!! Stupid
tiny digit stuff..... :-)

73, Garey - K4OAH
Glen Allen, VA

Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
<www.k4oah.com>

Garey Barrell k4oah@... [PHSNA] wrote:
>
>
> Hi Nick -
>
> I managed to kill my NAT, so thought it would be a good time to try your windows app for the
> PHSNA.....
>
> Working well, but came across an anomaly you probably are already aware of....
>
> I have changed the Start-up COM to 6, and changed the Oscillator frequency for 10.000 MHz and am
> getting into other functions.
>
> Anyway, got distracted. When I start Win 1.35, I get the following comments. Each 'retrying'
> is a result of clicking the Reset Arduino button.
>
> >>>
>
> Can't access file memories.txt, default values used.
> Could not find file 'C:\Documents and Settings\Garey\Desktop\PHSNA Windows\memories.txt'.
> Arduino reports its software version as: 1.2
>
> Retrying ...
> Arduino reports its software version as: 0.0
>
> Retrying ...Arduino software compiled for NICK. Other users should not see this message
> Other users set #define NICK 0 in first line of Arduino source code
>
> Arduino reports its software version as: 12.5
>
> Retrying ...
> Arduino reports its software version as: 0.6
>
> Retrying ...
> Arduino reports its software version as: 0.6
>
> >>>>>>>
>
> It seems to settle at v 0.6! :-) At various times I have also gotten v 0.3 and v 13.5 at
> other times?
>
> Back to the bench! Thanks for a great piece of software!
>
> 73, Garey - K4OAH
> Glen Allen, VA
>
> Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
> and TR-4/C Service Supplement CDs
> <www.k4oah.com>
>
>



__________ Information from ESET Smart Security, version of virus signature database 10628 (20141027) __________

The message was checked by ESET Smart Security.

http://www.eset.com



__________ Information from ESET Smart Security, version of virus signature database 10629 (20141027) __________

The message was checked by ESET Smart Security.

http://www.eset.com

Re: Windows (More)

Nick Kennedy
 

With all you've said, it does seem like it must be in the Nano.  It might be interesting to connect a solid source (maybe one or two AA cells) into the measurement jack and see if counts are still all over the place.  I was going to get your Aref but it seems you've already checked that out.

73-

Nick, WA5BDU


On Mon, Oct 27, 2014 at 4:19 PM, Garey Barrell k4oah@... [PHSNA] <PHSNA@...> wrote:
 


I have a couple more problems..... Yay... :-)

Using the 8307 power meter and DD60/Nano.

1. The meter is calibrated at 10 MHz using HP 606 attenuator topping at +10 DBM for 5.00 VDC.

2. The win app reads output of the DDS-60/Nano as 12.13 dB, even though meter reads +10 dBm. I
suspect this error is due to my inability to set the slope calibration. I'm getting wide
variations in the 'count' reading during the Calibration routine. The counts vary by 100's, and
if I keep returning the Cal, after about three or four different readings it seems to settle.
At 0 dBm, I'm getting 918 counts, eventually. But I can reduce to -10, the meter drops 10 dB but
the count remains the same! The DC voltage from the power meter is rock solid, and the meter
"meter" shows the expected 10 dB steps as the attenuator is reduced. That reading is also rock
solid. The Aref reference 5.00 volts is also solid. So.... is it possible for this variable
readout to be caused by the Nano, internally?

I guess I need to swap the Nano, and I have a 'spare' somewhere, but I can't find it!! Stupid
tiny digit stuff..... :-)

73, Garey - K4OAH
Glen Allen, VA

Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
<www.k4oah.com>

Garey Barrell k4oah@... [PHSNA] wrote:
>
>
> Hi Nick -
>
> I managed to kill my NAT, so thought it would be a good time to try your windows app for the
> PHSNA.....
>
> Working well, but came across an anomaly you probably are already aware of....
>
> I have changed the Start-up COM to 6, and changed the Oscillator frequency for 10.000 MHz and am
> getting into other functions.
>
> Anyway, got distracted. When I start Win 1.35, I get the following comments. Each 'retrying'
> is a result of clicking the Reset Arduino button.
>
> >>>
>
> Can't access file memories.txt, default values used.
> Could not find file 'C:\Documents and Settings\Garey\Desktop\PHSNA Windows\memories.txt'.
> Arduino reports its software version as: 1.2
>
> Retrying ...
> Arduino reports its software version as: 0.0
>
> Retrying ...Arduino software compiled for NICK. Other users should not see this message
> Other users set #define NICK 0 in first line of Arduino source code
>
> Arduino reports its software version as: 12.5
>
> Retrying ...
> Arduino reports its software version as: 0.6
>
> Retrying ...
> Arduino reports its software version as: 0.6
>
> >>>>>>>
>
> It seems to settle at v 0.6! :-) At various times I have also gotten v 0.3 and v 13.5 at
> other times?
>
> Back to the bench! Thanks for a great piece of software!
>
> 73, Garey - K4OAH
> Glen Allen, VA
>
> Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
> and TR-4/C Service Supplement CDs
> <www.k4oah.com>
>
>


Re: Windows (More)

Garey Barrell
 

I have a couple more problems..... Yay... :-)

Using the 8307 power meter and DD60/Nano.

1. The meter is calibrated at 10 MHz using HP 606 attenuator topping at +10 DBM for 5.00 VDC.

2. The win app reads output of the DDS-60/Nano as 12.13 dB, even though meter reads +10 dBm. I suspect this error is due to my inability to set the slope calibration. I'm getting wide variations in the 'count' reading during the Calibration routine. The counts vary by 100's, and if I keep returning the Cal, after about three or four different readings it seems to settle. At 0 dBm, I'm getting 918 counts, eventually. But I can reduce to -10, the meter drops 10 dB but the count remains the same! The DC voltage from the power meter is rock solid, and the meter "meter" shows the expected 10 dB steps as the attenuator is reduced. That reading is also rock solid. The Aref reference 5.00 volts is also solid. So.... is it possible for this variable readout to be caused by the Nano, internally?

I guess I need to swap the Nano, and I have a 'spare' somewhere, but I can't find it!! Stupid tiny digit stuff..... :-)

73, Garey - K4OAH
Glen Allen, VA

Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
<www.k4oah.com>

Garey Barrell k4oah@... [PHSNA] wrote:



Hi Nick -

I managed to kill my NAT, so thought it would be a good time to try your windows app for the
PHSNA.....

Working well, but came across an anomaly you probably are already aware of....

I have changed the Start-up COM to 6, and changed the Oscillator frequency for 10.000 MHz and am
getting into other functions.

Anyway, got distracted. When I start Win 1.35, I get the following comments. Each 'retrying'
is a result of clicking the Reset Arduino button.

Can't access file memories.txt, default values used.
Could not find file 'C:&#92;Documents and Settings&#92;Garey&#92;Desktop&#92;PHSNA Windows&#92;memories.txt'.
Arduino reports its software version as: 1.2

Retrying ...
Arduino reports its software version as: 0.0

Retrying ...Arduino software compiled for NICK. Other users should not see this message
Other users set #define NICK 0 in first line of Arduino source code

Arduino reports its software version as: 12.5

Retrying ...
Arduino reports its software version as: 0.6

Retrying ...
Arduino reports its software version as: 0.6

It seems to settle at v 0.6! :-) At various times I have also gotten v 0.3 and v 13.5 at
other times?

Back to the bench! Thanks for a great piece of software!

73, Garey - K4OAH
Glen Allen, VA

Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
<www.k4oah.com>

Cypress PSoC?

3ym3ym@...
 

An even lower cost alternative to Arduino Nano:
PSoC 4 CY8CKIT - 049 4xxx Prototyping Kits - Cypress

 

 A great deal for $4: 12-bit ADC, two DACs, opamps, comparators, a small PLD and an ARM microcontroller.
I couldn't find any mention of USB interface on the PSoC itself. The snap-off board on the left is supposed to be for programming only, but I guess it can also be repurposed as a USB to serial functional mode interface.

73, Mike


Re: Attenuator value question

Rob Moore <rmoore5@...>
 

Duh,  I was thinking of 4 x 6db, not three... Mea culpa!
 
Rob


On Monday, October 27, 2014 12:42 PM, "Garey Barrell k4oah@... [PHSNA]" <PHSNA@...> wrote:


 
Rob -

Is this that new 'Common Core' math??? 6 + 6 + 6 = 24?? :-)

73, Garey - K4OAH
Glen Allen, VA

Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs


Rob Moore rmoore5@... [PHSNA] wrote:
> The total of those three attenuators is 3+10+12 = 25 db and three 6db pads add up to 24db so
> they are approximately equivalent.
> Rob
>
>
> On Monday, October 27, 2014 10:24 AM, "john@... [PHSNA]" <PHSNA@...>
> wrote:
>
>
> HiApologies if this has been asked before but I’ve only been a member of the group since the
> end of July and I haven’t noticed any questions on this topic.
> I am just gathering together the parts for the project but I am a little confused about the
> attenuation pads around the low pass filter.
> Using drawing revision 6.06 (4^th May) it says that the attenuators are 3, 10 & 12db which
> will give an output of -10 dBm. The problem that I have is that the text says that the 3
> attenuator pads can be replaced by three 6db pads. I’m obviously missing something, and I
> apologise if that is the case, but they don’t really appear to be equivalent.
> It’s my first post to the group so please be gentle
> John.
>



Re: Windows

Garey Barrell
 

Hi Nick -

I managed to kill my NAT, so thought it would be a good time to try your windows app for the PHSNA.....

Working well, but came across an anomaly you probably are already aware of....

I have changed the Start-up COM to 6, and changed the Oscillator frequency for 10.000 MHz and am getting into other functions.

Anyway, got distracted. When I start Win 1.35, I get the following comments. Each 'retrying' is a result of clicking the Reset Arduino button.

Can't access file memories.txt, default values used.
Could not find file 'C:&#92;Documents and Settings&#92;Garey&#92;Desktop&#92;PHSNA Windows&#92;memories.txt'.
Arduino reports its software version as: 1.2

Retrying ...
Arduino reports its software version as: 0.0

Retrying ...Arduino software compiled for NICK. Other users should not see this message
Other users set #define NICK 0 in first line of Arduino source code

Arduino reports its software version as: 12.5

Retrying ...
Arduino reports its software version as: 0.6

Retrying ...
Arduino reports its software version as: 0.6

It seems to settle at v 0.6! :-) At various times I have also gotten v 0.3 and v 13.5 at other times?

Back to the bench! Thanks for a great piece of software!

73, Garey - K4OAH
Glen Allen, VA

Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
<www.k4oah.com>

Re: Attenuator value question

Garey Barrell
 

Rob -

Is this that new 'Common Core' math??? 6 + 6 + 6 = 24?? :-)

73, Garey - K4OAH
Glen Allen, VA

Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
<www.k4oah.com>

Rob Moore rmoore5@... [PHSNA] wrote:

The total of those three attenuators is 3+10+12 = 25 db and three 6db pads add up to 24db so they are approximately equivalent.
Rob


On Monday, October 27, 2014 10:24 AM, "john@... [PHSNA]" <PHSNA@...> wrote:


HiApologies if this has been asked before but I’ve only been a member of the group since the end of July and I haven’t noticed any questions on this topic.
I am just gathering together the parts for the project but I am a little confused about the attenuation pads around the low pass filter.
Using drawing revision 6.06 (4^th May) it says that the attenuators are 3, 10 & 12db which will give an output of -10 dBm. The problem that I have is that the text says that the 3 attenuator pads can be replaced by three 6db pads. I’m obviously missing something, and I apologise if that is the case, but they don’t really appear to be equivalent.
It’s my first post to the group so please be gentle
John.

Re: Attenuator value question

John Tyler
 

Hi Rob

3 x 6 = 18

Regards,
John

On 27/10/2014 18:15, Rob Moore rmoore5@... [PHSNA] wrote:
 
The total of those three attenuators is 3+10+12 = 25 db and three 6db pads add up to 24db so they are approximately equivalent.
 
Rob


On Monday, October 27, 2014 10:24 AM, "john@... [PHSNA]" wrote:


 
 
HiApologies if this has been asked before but I’ve only been a member of the group since the end of July and I haven’t noticed any questions on this topic.
I am just gathering together the parts for the project but I am a little confused about the attenuation pads around the low pass filter.
Using drawing revision 6.06 (4th May) it says that the attenuators are 3, 10 & 12db which will give an output of -10 dBm. The problem that I have is that the text says that the 3 attenuator pads can be replaced by three 6db pads. I’m obviously missing something, and I apologise if that is the case, but they don’t really appear to be equivalent.
It’s my first post to the group so please be gentle
John.


Re: Attenuator value question

Rob Moore <rmoore5@...>
 

The total of those three attenuators is 3+10+12 = 25 db and three 6db pads add up to 24db so they are approximately equivalent.
 
Rob


On Monday, October 27, 2014 10:24 AM, "john@... [PHSNA]" wrote:


 
 
HiApologies if this has been asked before but I’ve only been a member of the group since the end of July and I haven’t noticed any questions on this topic.
I am just gathering together the parts for the project but I am a little confused about the attenuation pads around the low pass filter.
Using drawing revision 6.06 (4th May) it says that the attenuators are 3, 10 & 12db which will give an output of -10 dBm. The problem that I have is that the text says that the 3 attenuator pads can be replaced by three 6db pads. I’m obviously missing something, and I apologise if that is the case, but they don’t really appear to be equivalent.
It’s my first post to the group so please be gentle
John.


Attenuator value question

John Tyler
 

 

HiApologies if this has been asked before but I’ve only been a member of the group since the end of July and I haven’t noticed any questions on this topic.

I am just gathering together the parts for the project but I am a little confused about the attenuation pads around the low pass filter.

Using drawing revision 6.06 (4th May) it says that the attenuators are 3, 10 & 12db which will give an output of -10 dBm. The problem that I have is that the text says that the 3 attenuator pads can be replaced by three 6db pads. I’m obviously missing something, and I apologise if that is the case, but they don’t really appear to be equivalent.

It’s my first post to the group so please be gentle

John.

Re: RF Power Meter - A Different Approach

N5IB
 

Reply settings strike again :^)
I was sending a request for a copy of QEX to one of the list members who's a local here in Baton Rouge.
Didn't mean to go to the group.

I have the QEX issue in hand now.

73,
Jim, N5IB

Re: Arduino sketch for PHSNA

Nick Kennedy
 

Well, I did buy a dozen AD8307 chips via eBay which probably came from China.  The one I used appears to be performing properly.

 

73-

 

Nick, WA5BDU

Re: Arduino sketch for PHSNA

VU3ZAG
 

Hi Nick,

      Thanks for the reply and support... I would also like to know whether the low cost Chinese clones of AD8307 available online are good choice or not for this project..?


Thanks.

Re: Arduino sketch for PHSNA

Nick Kennedy
 

Hello,

There are a couple of versions plus one that runs on the NAT portable terminal.

Probably the Windows version is the best starting point.  The software is in the Windows PHSNA folder.

You need two Arduino sketch files:  "PHSA_VC_1R2.ino" and "Morse.ino".  To run on your Windows PC you also need PHSNA.EXE.  Also download parameters.txt which has set-up parameters you will change when you set up and calibrate your own unit.  And get the latest version of the User's Guide PDF and look it over.

Another version interfaces with the Arduino by using a serial terminal instead of the dedicated Windows application.  For that version, go to the Current Software folder and download the Zip file which contains all the files you need.

73-

Nick, WA5BDU

Arduino sketch for PHSNA

VU3ZAG
 

Hi,


  Hi, I am new in this group would like to know where i can find Arduino sketch for generating excel data of scans in PC (not raspberry pi) and the GUI for scan operation. I searched this group for links but din found any... Please help..

Re: RF Power Meter - A Different Approach

ad7jt@...
 


Hi Dick,

 

Thanks for sharing your power meter with us.  I tried to get to OSH Park but their server must be down, I'll try again later.

 

What I have been using is just the isolated ground plane area cut off and trimmed to fit on the NAT PCB.  Your layout looks close enough to Jim's that it would probably work fine for me too.  If I can get an order in I'll try a few boards.

 

73,

Dave Collins - AD7JT

RF Power Meter - A Different Approach

dick faust
 

Dave Collins, AD7JT recently mentioned a need for a layout similar to one that I originally set up to work with the circuitry in the May/June 2013 QEX article by Loftur Jónasson TF33LJ/VE2LJX, “Squeeze Every Last Drop Out of the AD8307 Log Amp” pp. 29 -34.
Those that are interested will find more information on my web page
RF_Power_Meter


The Gerbers are shared there as well as OSH Park where PCBs can be ordered in groups of 3 @ $8.85/3

The boards fit in an optional Hammond enclosure.  A separate small board was also created with an amplifier and a precision reference, to use with the QEX meter and PSHNA circuits. Also available at OSH Park.
This board could also be placed on the back of a meter, with a power source, to make a two piece remote sensing power meter.

Dick K9IVB


Re: Power Meter isolation issue

Phil <philsemail@...>
 

Nick,
My build looks like the original. Case, meter, except I have binding posts. If the Fluke is attached and the unit is switched off, there's no reading on the meter. If I connect the fluke to the input the reading goes up 10 dbm, acting like an antenna, I suppose.
What does yours read, with nothing attached, just switch it on? Mine reads 2 V on a 5 V scale, calibrated with +10 dbm at 5 volts.

73 Phil N6WKZ

On 10/15/2014 10:27 AM, kennnick@... [PHSNA] wrote:
 

That does seem strange.  So you have a meter movement plus the ability to connect an external DMM?  My build from the original Hayward article was like that -- the meter output used banana jacks.  I never had your problem.  I did have the 10K resistor plus 0.001 uF feedthru capacitor like in the original article.  There's a photo or two of mine in my WA5BDU folder.

 

What if you connect your meter but keep it turned OFF?  That might tell you if it's pick-up or generated by the DMM.  What if you connect the meter leads to the RF input connector?  Just curious.

 

The main noise floor problem I had after building my PHSNA unit was eventually traced to a noisy three terminal regulator, 78L05 or equal. 

 

73-

 

Nick WA5BDU


Re: Power Meter isolation issue

Nick Kennedy
 

That does seem strange.  So you have a meter movement plus the ability to connect an external DMM?  My build from the original Hayward article was like that -- the meter output used banana jacks.  I never had your problem.  I did have the 10K resistor plus 0.001 uF feedthru capacitor like in the original article.  There's a photo or two of mine in my WA5BDU folder.

 

What if you connect your meter but keep it turned OFF?  That might tell you if it's pick-up or generated by the DMM.  What if you connect the meter leads to the RF input connector?  Just curious.

 

The main noise floor problem I had after building my PHSNA unit was eventually traced to a noisy three terminal regulator, 78L05 or equal. 

 

73-

 

Nick WA5BDU

Re: Power Meter isolation issue

Phil <philsemail@...>
 

Ed,
Yes, shielded box.
No .1 cap!  I'll try that, thanks!
Yes, internal batteries.
73 Phil N6WKZ

On 10/15/2014 7:38 AM, Ed Manuel n5em@... [PHSNA] wrote:
 

Phil,

A couple things to check.  First, is your power meter in a completely shielded box?  Second, do you have a 0.1uf bypass capacitor across the binding posts used for the output of your meter.  Are both your DMM and Power meter running off batteries (at least for testing).

Do you have this same problem if you put a scope on the output instead of the DMM.

Good luck with your testing.

Ed, N5EM

On 10/14/2014 11:52 PM, Phil philsemail@... [PHSNA] wrote:
 

John,
Thanks for the input. I have a Fluke 75.
I'll try your ideas.
But, I wonder HOW it's getting back to the input of the AD8307? (ground plane?)
Phil N6WKZ

On 10/14/2014 9:43 PM, John jlkolb@... [PHSNA] wrote:
 


A recent email somewhere indicated that their Fluke meter
was putting out a DC voltage, which affected what they were
trying to measure, so I looked at my model 77 and 87 with
a scope to check. Didn't see any DC offset, but see quite
a few millivolts of 60 Hz pickup from the long meter leads,
depending on how the leads are arranged, twisted together,
etc. Certainly putting the meter leads on the AD8307 would
cause a large output. Measuring other nodes might have some
adverse effect.

A banana plug to BNC adapter and BNC cable from the meter
to 8307 would reduce any AC pickup effects.

John KK6IL

On 10/14/2014 11:22 AM, philsemail@... [PHSNA] wrote:
> I'm on my second build of the AD8307 power meter. It works, but as soon
> as I connect my Fluke, the meter jumps about 20 db. So that kills my
> reading below -40db. I'm using binding posts, so I guess that's the
> problem... Any suggestions? Ferrite beads, feed through caps? Any help
> would be appreciated!
>
> 73 Phil N6WKZ
>
>