Date   
Is this the correct result?

Michael LeBlanc
 

I've just completed building a PHSNA and Power Meter. I've put the boards in their respective boxes. I have the Measurement Receiver and Crystal Test Fixtures half built, but I thought that I'd try out what I have to see if what I have so far works ok. I'm using the Arduino sketch SimpleSNA_WA5BDU_1r10_rev2r62. 


As a test, I found a simple IF can recovered from an old radio receiver (a TOKO type) and connected it up to see if I can detect a peak. I'm running this on a Mac and I don't have Excel so I'm copying and pasting the data into Plot2. I get something that looks credible, but there's no peak--instead, it's a very nice dip from -6dB to -23dB at around 455kHz. View the plot.


I'm not grasping why there's a drop in voltage at what I presume is the resonant frequency. Am I on the right track here, or do I have my wires crossed somewhere (either in my head or in the equipment)?


Michael VE1LEB


Arduino poor man network analyzer

Miguel Angelo Bartie
 

Hello friends

I post in my web page two new posts :
1. Arduino waveform generator and VFO with ARDUINO NANO and AD9833 ..from 0 to 12MHz.
2. Arduino simple  network analyzer and AF & RF generator ... it is a audio and RF (45MHz) generator ...and a antenna analyzer ( real part) & RF filters and circuits analyzer & Audio analyzer ...it is in first version  All in one !

Schematics, description, pictures and videos ... in my web page at :

PY2OHH QRP RADIO HOMEBREW EQUIPMENT (portuguese)

Choose receivers and transmitters .. item # 152 and 153

Videos also can be watched in youtube PY2OHH channel.

73 from py2ohh miguel


WTB PHSNA type 2

Mike Donovan
 

Hi all,


I want to buy a complete PHSNA with Type 2 AD9850 or AD9851 and RF Power Meter.


Please contact me at mdon01 (at) shaw (dot) ca


Pay via PayPal.


You must be willing to ship to Me in Canada


Mike Donovan VE7EPQ 

Re: Just starting out

Richard Wilson
 

Nick

I'm beginning to understand how the software works. I thought I was building a stand-alone box.

Now that I see how the PHSNA group handles software, I'll give it a try.

I'm using the type 2 DDS and I built a little 2n2222 amplifier that puts out about 0dBm.

Your amplifiers and filters are far better.

Thanks for the reply

Richard

Re: Just starting out

Richard Wilson
 


Vladimir

That appears to be a nice overview. I'll have to dig out all of the referenced documents before I understand what is going on.

Thanks for the reply

Richard


Re: Just starting out

Richard Wilson
 

Sounds like exactly what I need.

Thanks

Richard

Re: Just starting out

Gary Winblad
 

Hi Richard,

It sounds like you are building one like I did.  I took Nick's code and added code to use an encoder
and LCD to allow a "local mode".  This adds the capability to use it as a stand-alone RF signal
generator with sweep function and scope sync so I can align adjustable filters in real time.
VERY USEFUL to me.

I built mine in a single aluminum project box using ugly construction but it works great.

See folder "WB6OGD Local and Sweep Version" if interested.  Photos in album
"WB6OGD hot rod PHSNA".
73,
Gary
WB6OGD

Re: SW2 Reset switch

anglerhamming
 

Okay, I found the answer myself. I did a search and found a site that added a Reset switch on a breadboard to reset an Arduino Uno. The other side of the switch does indeed go to GND.

programmingelectronics.com/how-to-use-an-external-reset-button-with-arduino

Ted, KX4OM

SW2 Reset switch

anglerhamming
 

I am *this* close to finally getting this project finished. The boards have long since been built, and I'm getting the LPM, the SNA and the Measurement Receiver in boxes. I fooled around for a long time trying to get everything in just the right boxes. I did take the time to modify my original 2003 homebrew LPM to PHSNA Rev2.0 spec with the added components, and it now sports a new "397" 1mA meter with a calibrated dBm scale replacing the original uncalibrated the RadioShack meter. The new LPM is a nice Weston Model 506 50 uA meter with a new dBm scale, as well.

Back on topic, the BOM for the SNA lists SW2 for the Reset function. I put a pushbutton on the front of the Bud box, and there is a Reset pin sticking up on the top of the SNA PCB. I assume that switch is to take that to GND when pressed, but I need validation of that assumption. Neither the 2N5109 schematic (mine) or the ERA3 version schematic actually show SW2. I'm too close to the finish line to blow it now.

Tnx,
Ted, KX4OM


Just starting out

Vladimir Grijo
 

Hi Richard,
See the attached file.
It was very usefull to me.
Regards,
Vladimir

Re: Just starting out

Nick Kennedy
 

Well, you've got several elements of it. 

The PHSNA doesn't use a local display or encoder (or any other controls).

There are two main versions. In the terminal version, all the intelligence is in the Arduino sketch and it communicates with you via a serial terminal. 

In the Windows version, the sketch for the Arduino does minimal functions controlling the DDS and reading the ADC while most of the intelligence is in the Windows program which shows your results on your PC as any typical Windows program would.

There are two major hardware components. 

First is an AD8307 log RF power detector circuit. It's in a separate box to keep noise low. Its DC output signal goes to an ADC pin in the Arduino.

The other box contains the rest of the PHSNA hardware, which includes an Arduino, a DDS, post-DDS filtering and amplification and/or attenuation if required. Most of the complexity of the different versions comes from the fact that there are designs for a couple different form-factor eBay DDS boards plus the AmQRP / Midnight Engineering DDS-60 board. Also one post-amplifier used a transistor and another used an MMIC. 

Having this set-up, your calibrated RF output from the DDS box generally goes through the DUT and then to the log power meter and its output goes back to the Arduino.  Other fixtures may be used, such as a crystal measurement fixture or a return loss bridge, depending on what you're testing at the moment.

73-

Nick, WA5BDU



On Sun, Sep 25, 2016 at 5:49 PM, lancer979@... [PHSNA] <PHSNA@...> wrote:
 

I'm starting out with an arduino nano v3.0 pro mini (on board FTDI and 5v regulator)

I'm hooked up to a 1602 LCD display on D4 to D7 and D12 to D13.

My DDS AD9850 module (125MHz clock) is on D8 to D11.

I'm using a nice AD8307 module - well shielded with an SMA connector - connected to A0.

I have a shaft encoder on D2 and D3


Is this setup anywhere close to a PHSNA as this group defines them?


I'm a little confused with the large number of options and boards members of this group are using.

I don't understand the software (arduino sketches or PC applications) or how they apply.


I hope to start out with something clean and simple then expand to more complexity.

The hope is to do frequency response measurements of filters and crystals to start out with. 


Can anyone in the group help me out?


Richard


Just starting out

Richard Wilson
 

I'm starting out with an arduino nano v3.0 pro mini (on board FTDI and 5v regulator)

I'm hooked up to a 1602 LCD display on D4 to D7 and D12 to D13.

My DDS AD9850 module (125MHz clock) is on D8 to D11.

I'm using a nice AD8307 module - well shielded with an SMA connector - connected to A0.

I have a shaft encoder on D2 and D3


Is this setup anywhere close to a PHSNA as this group defines them?


I'm a little confused with the large number of options and boards members of this group are using.

I don't understand the software (arduino sketches or PC applications) or how they apply.


I hope to start out with something clean and simple then expand to more complexity.

The hope is to do frequency response measurements of filters and crystals to start out with. 


Can anyone in the group help me out?


Richard

Just starting out

Richard Wilson
 

I'm starting out with an arduino nano v3.0 pro mini (on board FTDI and 5v regulator)

I'm hooked up to a 1602 LCD display on D4 to D7 and D12 to D13.

My DDS AD9850 module (125MHz clock) is on D8 to D11.

I'm using a nice AD8307 module - well shielded with an SMA connector - connected to A0.

I have a shaft encoder on D2 and D3


Is this setup anywhere close to a PHSNA as this group defines them?


I'm a little confused with the large number of options and boards members of this group are using.

I don't understand the software (arduino sketches or PC applications) or how they apply.


I hope to start out with something clean and simple then expand to more complexity.

The hope is to do frequency response measurements of filters and crystals to start out with. 


Can anyone in the group help me out?


Richard

Re: New file uploaded to PHSNA

dick faust
 

In case someone is interested in a "leveler" I took Sam Wetterlin's info
http://www.wetterlin.org/sam/SA/MSACal/CalAccessories.htm
and made a PCB.  I have also shared the layout on OSH Park today.
OSH Park ~ Signal Leveler

 

Attached is a schematic and BOM.

Dick K9IVB

Re: New file uploaded to PHSNA

K5ESS
 

Marcus,

Yes, I have modified the DDS board for differential output and use the Mini Circuits T1-1T transformer.

Best Regards

Mike K5ESS

 

From: PHSNA@... [mailto:PHSNA@...]
Sent: Thursday, September 08, 2016 1:59 AM
To: PHSNA@...
Subject: Re: [PHSNA] New file uploaded to PHSNA

 

 

Funny,

 

I've also almost done the same thing. Yesterday I send my AD8008 amplifier board with a modified version of the ALC (http://www.cwtd.org/May_6-2014.html) to OSHpark. I changed the peak detector and added a control pot to the first op amp and removed the second one. The third one is still there.

 

I intend to use the board with the experimenters board as v2.0 of my homebrew RF generator. However I have modified my DDS board to use differential output with a Mini Circuits T1-1T transformer. Do you use an modified DDS board or not?

 

My solution lacks your clever mounting solution.

 

Br

Marcus, SA5PMG

 

On Thu, Sep 8, 2016 at 5:09 AM, <PHSNA@...> wrote:

 


Hello,

This email message is a notification to let you know that
a file has been uploaded to the Files area of the PHSNA
group.

File : /K5ESS/AD8008 amplifier/AD8008 Amplifier for the PHSNA Experimenters Board.pdf
Uploaded by : nothdurftm <k5ess.nothdurft@...>
Description : Describes an add-on amplifier for the Experimenters board. Essentially a clone of the DDS-60 amplifier.

You can access this file at the URL:
https://groups.yahoo.com/neo/groups/PHSNA/files/K5ESS/AD8008%20amplifier/AD8008%20Amplifier%20for%20the%20PHSNA%20Experimenters%20Board.pdf

To learn more about file sharing for your group, please visit:
https://help.yahoo.com/kb/index?page=content&y=PROD_GRPS&locale=en_US&id=SLN15398

Regards,

nothdurftm <k5ess.nothdurft@...>

 

Re: New file uploaded to PHSNA

Marcus Gustafsson
 

Funny,

I've also almost done the same thing. Yesterday I send my AD8008 amplifier board with a modified version of the ALC (http://www.cwtd.org/May_6-2014.html) to OSHpark. I changed the peak detector and added a control pot to the first op amp and removed the second one. The third one is still there.

I intend to use the board with the experimenters board as v2.0 of my homebrew RF generator. However I have modified my DDS board to use differential output with a Mini Circuits T1-1T transformer. Do you use an modified DDS board or not?

My solution lacks your clever mounting solution.

Br
Marcus, SA5PMG

On Thu, Sep 8, 2016 at 5:09 AM, <PHSNA@...> wrote:
 


Hello,

This email message is a notification to let you know that
a file has been uploaded to the Files area of the PHSNA
group.

File : /K5ESS/AD8008 amplifier/AD8008 Amplifier for the PHSNA Experimenters Board.pdf
Uploaded by : nothdurftm <k5ess.nothdurft@...>
Description : Describes an add-on amplifier for the Experimenters board. Essentially a clone of the DDS-60 amplifier.

You can access this file at the URL:
https://groups.yahoo.com/neo/groups/PHSNA/files/K5ESS/AD8008%20amplifier/AD8008%20Amplifier%20for%20the%20PHSNA%20Experimenters%20Board.pdf

To learn more about file sharing for your group, please visit:
https://help.yahoo.com/kb/index?page=content&y=PROD_GRPS&locale=en_US&id=SLN15398

Regards,

nothdurftm <k5ess.nothdurft@...>


New file uploaded to PHSNA

PHSNA@...
 

Hello,


This email message is a notification to let you know that
a file has been uploaded to the Files area of the PHSNA
group.


File : /K5ESS/AD8008 amplifier/AD8008 Amplifier for the PHSNA Experimenters Board.pdf
Uploaded by : nothdurftm <k5ess.nothdurft@...>
Description : Describes an add-on amplifier for the Experimenters board. Essentially a clone of the DDS-60 amplifier.


You can access this file at the URL:
https://groups.yahoo.com/neo/groups/PHSNA/files/K5ESS/AD8008%20amplifier/AD8008%20Amplifier%20for%20the%20PHSNA%20Experimenters%20Board.pdf


To learn more about file sharing for your group, please visit:
https://help.yahoo.com/kb/index?page=content&y=PROD_GRPS&locale=en_US&id=SLN15398


Regards,


nothdurftm <k5ess.nothdurft@...>

Re: Output Impedance?

Asadullah Mir
 

Hi Nick!

 I too was wondering how theS22 is +- 50Ohms.

On the other hand I am wondering why was an MMIC used in the first place. I can get equally good results if I directly use the 9851 output. A match with a 4:1 balun or in my case UNUN does the impedance match.

Any idea why an MMIC was used? I just adds to harmonic and other distortion.

 

I think some more explanation is called for.

I guess you might remember that many moons ago I pasted some pictures of SNA I built from scratch. I was considering posting it to the group but wanted to improve is somewhat and be ready to answer questions regarding the HW/SW.  I could not get around to doing it due to some bit of illness. ( It was all assembly so hard to remember the details)  During this time I decided to learn some embedded C and as an exercise to rewrite the SNA SW in C. I also did not like the slow serial connect to the Graphic LCD ( GLCD!) etc. S0 I decided to use a 3.2 inch GLCD. This one has a 16 bit parallel data interface so the old 32 pin IC would not do and I switched to a more modern C8051F020 from Silicon Labs.

I was looking at the output of the AD9851 and decided that I don't really need the MMIC. I have a few AD9851 boards with the filter built in and decided that a single ended signal take off would do.

I have used a 200 Ohm R on the output of the AD9851 board removed the filter and used a 4:1 Ruthroff UNUN The output is over the top. Enough to do any old testing of networks.

The output level is calculated as follows. ( excluding the attenuation of any built in LP filter. I have removed mine)

The Peak I out is 10mA.  The 200 ohms at the output and the 50 ohms reflected as 200 ohms at the output of the SNA = total 100 Ohms. The 10 mA x 100 ohms gives a peak of 1000 mV and 0.707 V rms output which reduces to .707/2 =353 mV rms at the SNA terminals ( UNUN). This equals +4dBm

Enough for my needs. The out impedance is 50 Ohms. I intend to build a few small external filters for use in different applications. Sweep scan is variable from 480 Hz to 50 MHz. I think the fastest  scan is 300mSec. Slowest is several seconds.

 

I will try upload the pictures and schematic and SW as soon as I am happy with the details. It is written in C except a few fast routines for the GLCD  in Assembly.  I have used no library routines as  all is home brew. and the SW is as efficient as I could make it. This is an 8051 U-controller so some people might not be familiar but it is the best uC  in the world. ( In my view, that is)

I think the real DIY guys should find it interesting.


 73


Azzythehillbilly

Re: Resistor value on the PowerMeter board

Pravin
 

Hi Philippe,
                         R3,R8&R12 should be 6.8 Ohms only ( not K) and R9 should be 51 ohms . I have assembled the board at least an year ago and it works perfectly with these values. Hope it helps. 73
DE (AB9XC)
(Pravin)


On Sep 1, 2016, at 10:15 AM, n5ib@... [PHSNA] <PHSNA@...> wrote:

 

 Hello all, Hello Jim,

I am soldering components on the RF Power Meter board III.

I discovered my bag with 6.8R contains in fact, 6.8K resistors. My question is this one. I was wondering, for the three resistors R3 , R8 and R12, if the value of 6.8 ohms is critical.  Same question for R9 of 51 ohms.
If yes , Jim, how do you explain these values? 

Best regards, Philippe - F4GRT

 

 

Resistor value on the PowerMeter board

Philippe.Creis@...
 

Hello all, Hello Jim,

I am soldering components on the RF Power Meter board III.

I discovered my bag with 6.8R contains in fact, 6.8K resistors. My question is this one. I was wondering, for the three resistors R3 , R8 and R12, if the value of 6.8 ohms is critical.  Same question for R9 of 51 ohms.
If yes , Jim, how do you explain these values? 

Best regards, Philippe - F4GRT