Date   

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 : /YANA_AD9851_170211.pdf
Uploaded by : k1trb <w0lwa@yahoo.com>
Description : Firmware for Yana


You can access this file at the URL:
https://groups.yahoo.com/neo/groups/PHSNA/files/YANA_AD9851_170211.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,


k1trb <w0lwa@yahoo.com>


Experimenter board and Si5351A

EB4APL
 

Hello,

I want to know if somebody has made or adapted an Arduino sketch for using the QRP-labs Si5351A synthesizer board mounted in the Experimenter Board.
I could be a very simple demo type one, I want to test that it works before starting my own. What puzzles me is why the standard Arduino I2C pins are not used.

Best regards,

Ignacio, EB4APL


Re: Info Update

N5IB
 

Look in the Files area
Folder: "Experimenter PC Board  --  for Type II DDS and Arduino NANO"
File: "DDS Type2  Arduino NANO Experimenter Board revs1r00  1r20.pdf"
 
I didn't change any date information or versions, just added in a page near the end of the document. Look on page 11.
 
Jim


Info Update

N5IB
 

Ignatio (EB4APL) has contributed a schematic drawing showing the connection of the Arduino NANO and a QRP Labs Si5351A module using the Experimenter Board as a platform. I've added it to the regular Experimenter Board document posted in the Files Aarea.

On the PCB front, here's all that remains:

1           PHSNA for Type-1 DDS and Arduino UNO
1 set     Measurement Receiver 2-board set
5 ea      AD8307 Power Meter
2 ea      older rev 1.04 Experimenter Board (no 3.3V regulator pads)
7 ea      older rev 8.02 PHSNA for DDS60 and NANO (no extra pads for Bluetooth module

if you want any of these contact me OFF LIST PLEASE

                    n5ib (at) juno (dot) com

Jim, N5IB



Re: New file uploaded to PHSNA (Balun meaqsurement unsatisfactory)

Pravin
 

Hi Steve,
              Thanks to your reference I was able to correct the connections of the 4:1 Gunella balun and now it works as desired at least with a 200 ohms resistive load. I simply flipped one of the cores and re connected and it worked as desired over the whole frequency range of interest. I used the same two FT140-61 cores with identical 8T bifilar windings . I am attaching the SWR measurement curves for your info .Once gain thanking you for your timely suggestions.

73
DE AB9XC
(Pravin)



From: "sbdick@... [PHSNA]" To: PHSNA@...
Sent: Tuesday, January 24, 2017 7:01 PM
Subject: Re: [PHSNA] Re: New file uploaded to PHSNA (Balun meaqsurement unsatisfactory)

 
Hi Prevan. your schematic doesn't show polarities of each of the windings.  You may want to refer to the following link and make sure interconnections are all correct for the two core Guanella current balun.  Also insure that that neither side of the 200 ohm load is inadvertently grounded.  Here's the reference link:
http://www.hbphoto.com/Radio/Baluns_101.pdf

"Digital Steve", K1RF



PC Boards

N5IB
 

Most of the requested PC boards have been mailed. There are still a couple of folks who have not yet responded to e-mails.
If you had requested boards in December, but have not heard from me in the past few days -- check your spam folder  :^))

As soon as these couple of requests are resolved I'll post what, if anything, is left over and still available.

Jim, N5IB




Re: PC Boards delivered

N5IB
 

Shucks.... misspelled my own e-mail address... trying again  :^))

The FedEx guy dropped off PC boards yesterday, and I have sent e-mails to all who had requested boards prior to placing that order.

There are a few remaining now that those requests have been filled.
If you want any of these, please reply OFF LIST PLEASE

n5ib (at) juno (dot) com

There was not enough demand to order more of the Type-2 PHSNA

Here's what remains in the cupboard:

5 ea - PHSNA for Type-1 DDS and UNO  $4.50

2 ea - PHSNA for DDS-60 and NANO   $4.00

3 ea - Experimenter Board for Type-2 and NANO $4.00

3 ea - Crystal Test Fixture $4.00

15 ea - AD-8307 Power Meter  $3.50

2 ea - Return Loss Bridge with 1% resistors  $2.00
3 ea - Type-1 / Type-2 DDS adapter board $2.00

2 ea - Low Pass Filter   $1.00
5 sets - Measurement Receiver 2-board set $8.00

Postage extra for the above.
USA postage is usually under $2.50, DX a couple of dollars more, depending on how many boards.


Jim, N5IB



Re: New file uploaded to PHSNA (Balun meaqsurement unsatisfactory)

Steven Dick
 

Hi Prevan. your schematic doesn't show polarities of each of the windings.  You may want to refer to the following link and make sure interconnections are all correct for the two core Guanella current balun.  Also insure that that neither side of the 200 ohm load is inadvertently grounded.  Here's the reference link:
http://www.hbphoto.com/Radio/Baluns_101.pdf

"Digital Steve", K1RF


Re: New file uploaded to PHSNA (Balun meaqsurement unsatisfactory)

Pravin
 

Hi Ignacio,
                  Yes you are correct .It is a 4:1 Gunella balun. Still I propose to use ferrite beads on the cable near the feed end to reduce any residual common mode currents possible on the cable braid as the OCF dipole is not a symmetrical antenna.

73
DE AB9XC
(Pravin)
 




From: "EB4APL eb4apl@... [PHSNA]"
To: PHSNA@...
Sent: Monday, January 23, 2017 5:48 PM
Subject: Re: [PHSNA] Re: New file uploaded to PHSNA (Balun meaqsurement unsatisfactory)

 
Probably he is using a 4:1  current type "Guanella " balun. These do several functions:
1- Transform the 200 Ohm line (or antenna) impedance to 50 Ohm.
2- Transform the balanced line to unbalanced one (coax) . This where the name BALUN comes from.
3- Insure that the currents in the balanced line are symmetrical and avoids common mode currents. So it is also a common mode choke.
Functions 1 and 2 can be done with a voltage balun, the type commonly found in antenna tuners with symmetrical output. These uses a single core.
The Guanella balun needs two identical cores and windings. There is a lot info about them on internet.
73 de Ignacio, EB4APL


El 24/01/2017 a las 0:35, sbdick@... [PHSNA] escribió:
 
Hi Nivar_P. Your writeup says you are using two identical cores with identical 8 turns of bifilar windings configured to work as a 4:1 balun. Not sure how you are electrically interconnecting the bifilar windings on the two cores. Maybe you could post a schematic? Most baluns I've seen use a single core.  It is acting like you don't have good enough coupling between the windings in the bifilar pairs.  What is your physical configuration of the bifilar windings? The wires need to be closely adjacent to each other in the bifilar pairs to act as a transmission line at high frequencies.

"Digital Steve" K1RF




Re: New file uploaded to PHSNA (Balun meaqsurement unsatisfactory)

Pravin
 

Hi Ignacio,
                     As suggested by you I wound 4 bifilar turns (13.5uH) on a pair of FT140-43 cores and configured it into a 4:1 balun and repeated the test on the PHSNA with exact same old results as shown in the attached graph. This time I used a 30MHz LPF between the PHSNA output and the RLB GEN input so as to rule out the possibility of any harmonics coming into the play. But absolutely no change with or without it.  Once again thanks for your time.

73
DE AB9XC
(Pravin)

 




From: "EB4APL eb4apl@... [PHSNA]"
To: PHSNA@...
Sent: Monday, January 23, 2017 5:48 PM
Subject: Re: [PHSNA] Re: New file uploaded to PHSNA (Balun meaqsurement unsatisfactory)

 
Probably he is using a 4:1  current type "Guanella " balun. These do several functions:
1- Transform the 200 Ohm line (or antenna) impedance to 50 Ohm.
2- Transform the balanced line to unbalanced one (coax) . This where the name BALUN comes from.
3- Insure that the currents in the balanced line are symmetrical and avoids common mode currents. So it is also a common mode choke.
Functions 1 and 2 can be done with a voltage balun, the type commonly found in antenna tuners with symmetrical output. These uses a single core.
The Guanella balun needs two identical cores and windings. There is a lot info about them on internet.
73 de Ignacio, EB4APL


El 24/01/2017 a las 0:35, sbdick@... [PHSNA] escribió:
 
Hi Nivar_P. Your writeup says you are using two identical cores with identical 8 turns of bifilar windings configured to work as a 4:1 balun. Not sure how you are electrically interconnecting the bifilar windings on the two cores. Maybe you could post a schematic? Most baluns I've seen use a single core.  It is acting like you don't have good enough coupling between the windings in the bifilar pairs.  What is your physical configuration of the bifilar windings? The wires need to be closely adjacent to each other in the bifilar pairs to act as a transmission line at high frequencies.

"Digital Steve" K1RF




Re: New file uploaded to PHSNA (Balun meaqsurement unsatisfactory)

Pravin
 

Hi Steve,
                    Thanks for responding to my post . As requested please find attached the balun schematic and also how it is wound . Yes the wires in the transmission lines are  as close as possible and parallel to each other . Also being dual core there is sufficient space to make the turns well apart so as to reduce the self capacitance and increase high frequency response. But whatever I do like change cores change number of turns etc the SWR plotted using PHSNA and the associated RLB is invariably as shown in the attached graph!! . Now I think I have to try same type cores (FT140-61 and FT140-43) from a different manufacturer. Also when I plot the SWR of a 50 Ohms coaxial load using the same setup  the curve is almost flat even beyond 30MHz ! .

73
DE AB9XC
(Pravin)
 




From: "sbdick@... [PHSNA]"
To: PHSNA@...
Sent: Monday, January 23, 2017 4:35 PM
Subject: [PHSNA] Re: New file uploaded to PHSNA (Balun meaqsurement unsatisfactory)

 
Hi Nivar_P. Your writeup says you are using two identical cores with identical 8 turns of bifilar windings configured to work as a 4:1 balun. Not sure how you are electrically interconnecting the bifilar windings on the two cores. Maybe you could post a schematic? Most baluns I've seen use a single core.  It is acting like you don't have good enough coupling between the windings in the bifilar pairs.  What is your physical configuration of the bifilar windings? The wires need to be closely adjacent to each other in the bifilar pairs to act as a transmission line at high frequencies.

"Digital Steve" K1RF



Re: New file uploaded to PHSNA (Balun meaqsurement unsatisfactory)

EB4APL
 

Probably he is using a 4:1  current type "Guanella " balun. These do several functions:

1- Transform the 200 Ohm line (or antenna) impedance to 50 Ohm.
2- Transform the balanced line to unbalanced one (coax) . This where the name BALUN comes from.
3- Insure that the currents in the balanced line are symmetrical and avoids common mode currents. So it is also a common mode choke.
Functions 1 and 2 can be done with a voltage balun, the type commonly found in antenna tuners with symmetrical output. These uses a single core.
The Guanella balun needs two identical cores and windings. There is a lot info about them on internet.

73 de Ignacio, EB4APL



El 24/01/2017 a las 0:35, sbdick@... [PHSNA] escribió:
 

Hi Nivar_P. Your writeup says you are using two identical cores with identical 8 turns of bifilar windings configured to work as a 4:1 balun. Not sure how you are electrically interconnecting the bifilar windings on the two cores. Maybe you could post a schematic? Most baluns I've seen use a single core.  It is acting like you don't have good enough coupling between the windings in the bifilar pairs.  What is your physical configuration of the bifilar windings? The wires need to be closely adjacent to each other in the bifilar pairs to act as a transmission line at high frequencies.

"Digital Steve" K1RF



Re: New file uploaded to PHSNA (Balun meaqsurement unsatisfactory)

Steven Dick
 

Hi Nivar_P. Your writeup says you are using two identical cores with identical 8 turns of bifilar windings configured to work as a 4:1 balun. Not sure how you are electrically interconnecting the bifilar windings on the two cores. Maybe you could post a schematic? Most baluns I've seen use a single core.  It is acting like you don't have good enough coupling between the windings in the bifilar pairs.  What is your physical configuration of the bifilar windings? The wires need to be closely adjacent to each other in the bifilar pairs to act as a transmission line at high frequencies.

"Digital Steve" K1RF


Re: Thanks and DDS filter query

Alfredo Mendiola Loyola
 

Hello,

Try this guide to make Harmonic Filter.

I made the filter for the 10Mhz and works perfect.

 
Regards
Alfredo Mendiola Loyola


Re: Thanks and DDS filter query

David
 

Hi Jim,
It's a type 2 board and I'm planning to build it to the exact spec detailed in the relevant folder on here with the filter change etc but it will be useful to get it working as is for now pending the correct components, pcb etc.

Thanks for the extra info, much appreciated.

David


Re: Thanks and DDS filter query

N5IB
 

Hi David,

On the DDS filters...

The biggest issue is that the filter on the DDS module, regardless of whether a 9850 or a 9851 DDS is being used, is designed for a roll off at about 70 MHz. While this might be OK for a 9851, it is much too high for a 9850. That filter should roll off at a bit above 30 MHz.

Also, the L and C components used in the on-board filter are not of particularly high quality.

Finally, if you are using the "Type-2" DDS with the corresponding PHSNA or Experimenter boards, the circuit is designed to take the output from both of the available sinewave output pins and combine them with a transformer is a push-pull fashion, which helps to suppress even harmonics. The filter on the DDS module is applied to only one of the outputs, which would upset the symmetry.

You can certainly go "as is" for the time being and apply signal to the detector. It won't hurt anything. You probably just won't get quite as clean a signal as otherwise

The "Type-1" DDS and PHSNA board would be much more suitable if you wished not to remove the filter from the DDS. A filter of the appropriate roll off is included on the PHSNA board.

Jim, N5IB


Thanks and DDS filter query

David
 

I've only just started building the PHSNA but already the UNO and Ad9850 with the Arduino and Windows software has allowed me to generate test sigs proving one of the band pass filters in my G3TSO multiband txrx is way out (I stared building this in 1999 and never finished it properly!) I will wait now until the PHSNA is built before doing more work on my switchable filters but wanted to say thanks to everyone involved in the project - maybe if I'd had one back in 1999 I'd have finished the original radio back then.


Also could someone please point me at some background info ref the changes needed to the DDS filter, I've seen the details on what needs to be done to improve it,  but wondered what the issue is with the built-in filter on the board......wondering really if I can get away with amplifying this to get some signal to the detector initially before doing it properly as components etc become available.


Thanks,


David - G4ZDT


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 : /Balun measurements using PHSNA and RLB.pdf
Uploaded by : nivar_p <nivar_p@hotmail.com>
Description : HF balun was tested with 200 ohms dummy resistor to verify its performance before using on a 80 mtr to 10 mtr OCF dipole antenna with unsatisfactory results.


You can access this file at the URL:
https://groups.yahoo.com/neo/groups/PHSNA/files/Balun%20measurements%20using%20PHSNA%20and%20RLB.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,


nivar_p <nivar_p@hotmail.com>


Re: PC Boards

N5IB
 


Hello Jim  read on the forum yahoo group Scalar Network AnalyzerWhat he was interested and available kit or
pc board?
73 de iw5bsf  Roberto
 


Re: PC Boards

Roberto
 

Hello Jim  read on the forum yahoo group Scalar Network AnalyzerWhat he was interested and available kit or
pc board?
73 de iw5bsf  Roberto

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