Date   

Re: Source of Arduino NANO board

N2MS
 

Do the CH340G chips work with the latest FTDI drivers?

I've been using an XP laptop with my boards but want to use my new W8 laptop for my experiments.

Mike N2MS

----- Original Message -----
From: DuWayne Schmidlkofer duwayne@... [PHSNA] <PHSNA@...>
To: PHSNA@...
Sent: Fri, 18 Sep 2015 18:37:16 -0000 (UTC)
Subject: Re: [PHSNA] Source of Arduino NANO board

I have been using the Chinese clones with the CH340G chips instead of
the FTDI chip with no problems. Available from several places for under
$5.00 with shipping.
DuWayne

On 9/18/2015 12:53 PM, mstangelo@... [PHSNA] wrote:
Folks,

I was thinking of purchasing a Arduino NANO 3.0 Compatible board from
Marlin P Jones since they had it on sale for $6.99.

I call up tech support to ask about the FTDI USB chip since I am
concerned about the chip being disabled with the latest FTDI drivers.

Tech support told me the compabible board does not use FTDI chips. It is
also out of stock and they will not have them for a couple of months.

Does anyone know where we can purchase NANO 3.0 boards with genuine FTDI
chips?

Is FTDI still disabling counterfeit chips with their drivers?

Thanks,


Re: Source of Arduino NANO board

DuWayne Schmidlkofer
 

I have been using the Chinese clones with the CH340G chips instead of the FTDI chip with no problems. Available from several places for under $5.00 with shipping.
DuWayne

On 9/18/2015 12:53 PM, mstangelo@... [PHSNA] wrote:
Folks,

I was thinking of purchasing a Arduino NANO 3.0 Compatible board from
Marlin P Jones since they had it on sale for $6.99.

I call up tech support to ask about the FTDI USB chip since I am
concerned about the chip being disabled with the latest FTDI drivers.

Tech support told me the compabible board does not use FTDI chips. It is
also out of stock and they will not have them for a couple of months.

Does anyone know where we can purchase NANO 3.0 boards with genuine FTDI
chips?

Is FTDI still disabling counterfeit chips with their drivers?

Thanks,


Source of Arduino NANO board

N2MS
 

Folks,

I was thinking of purchasing a Arduino NANO 3.0 Compatible board from Marlin P Jones since they had it on sale for $6.99.

I call up tech support to ask about the FTDI USB chip since I am concerned about the chip being disabled with the latest FTDI drivers.

Tech support told me the compabible board does not use FTDI chips. It is also out of stock and they will not have them for a couple of months.

Does anyone know where we can purchase NANO 3.0 boards with genuine FTDI chips?

Is FTDI still disabling counterfeit chips with their drivers?

Thanks,


Re: PC Boards - Staus update

N5IB
 

Forgot to add that the Crystal Test Fixture is also on the list for requests @ $4.00

Jim, N5IB


PC Boards - Staus update

N5IB
 

I've ordered the test run of the Experimenter Board. They should take about 2 to 3 weeks to arrive. During that time I can still accept requests for that board. An updated document is posted in the Files area with the latest information on that board and the possible use with QRP-Labs Si5351A module.

At the very end of the document you'll find images of a little adapter I drew up that will allow a Type I DDS to substitute where a Type II goes, and vice versa, depending on how you install pins and sockets. That means it will also make it possible for a QRP-Labs module to be used where a Type I DDS was previously.

The Experimenter Board bulk order is going to be a big one - over a hundred requests - so we might as well take advantage of combined shipping. While waiting for the test run of experimenter boards I'll also entertain requests for the other PC boards we've had in the past, as well as the new little adapter. So These boards are up for requests:

    Experimenter Board ($5 postpaid CONUS, or $4 + postage if combined with others)
    Type I / Type II adapter board  $2.00

     PHSNA for Type I DDS and UNO  $4.50

     PHSNA for Type II DDS and UNO  $4.50

     PHSNA for DDS-60 and NANO   $4.00

     AD-8307 Power Meter  $3.50

     Return loss Bridge with 1% resistors  $2.00

     Low Pass Filter   $1.00


All of the above are plus postage

usually less than $2 CONUS and less than $4 DX for up to three or four boards.

No assurance I can get all of them, but if the numbers are sufficient to fit into the bulk order I will do so.


As always please respond off list to        n5ib (at) juno (dot) com.


73

Jim, N5IB




Re: Last call for experimenter boards

alan_r_cam@...
 

Sorry, I can't order your board - although I'd like to.

My Significant Other went on ebay and bought me... the AD9851 board.


Sure it has slightly better specs, but the dimensions [and pinout] make it physically incompatible, let alone the changes I will eventually have to make to the NANO code.


So, for the sake of domestic harmony, I will have to give the board a miss - although I'll happily borrow the schematic for inspiration.


-- Alan


Re: Xtal filter bandwidth

William Kimber
 

Thanks DUWayne & ,

I should have googled before putting fingers to keys.  Slap on wrist with wet bus ticket.

I was thinking in terms of SBB to AM.  Might be feasible. frequency shift wouldn't be too much of a problem. Just need time/energy to play.

Cheers,
Will

On 15/09/15 12:05, DuWayne Schmidlkofer duwayne@... [PHSNA] wrote:
 

It was patented by TenTec in 1988  (US patent  #5051711) commonly known as the Jones filter after the designer.  It is used in many of the TenTec transceivers.
Also used in several of the Elecraft transceivers and other manufactures as well as in many homebrew QRP transceivers.  There is quite a bit of information on these types of filters if you search for variable bandwidth crystal filters. The circuit in the patent document is pretty close to what is commonly used, except that most implementations use a fixed resistors instead of the variable resistor that allows tailoring the bandpass shape.  The only problem I remember reading about is that along with the bandwidth, the center frequency also changes slightly.  Somewhere I read about a slightly different circuit that keeps a constant center frequency when the bandwidth is changed, unfortunately I can not find the article at this time.
DuWayne KV4QB

On 9/14/2015 6:36 PM, Will zl1tao@... [PHSNA] wrote:
 


Would it be practical to use varicap diodes to vary bandwidth of xtal
filters? Instead of using fixed value caps it is obviously possible to
replace or use in parallel with fixed capacitor between xtals to ground.

However would the low Q of varicaps and or the resistor used to feed the
DC to them upset the Q too much. Also would it effect the termination
impedances so that the matching was not matched.

Cheers,
Will




Re: Last call for experimenter boards

N5IB
 


The requests for experimenter boards are closing in on the century mark.
With this many boards (and $$), I don't want to risk messing it up - hi - so I'm going to get a batch of 10 made, and verify that everything looks and fits like I want it to. Then I'll make the bulk order.

This means the proto batch will be about 3 weeks away, and the rest of them about three weeks after that. Sorry for the extra delay, but I want to be sure its a good product.

Now for some interesting news... Dick (K9IVB) discovered that the QRP-Labs synthesizer module that uses the Si5351A chip has a pinout that is close enough to the Type II DDS that it can be plugged into the Experimenter Board in place of the Type II. There are a couple of "be careful to do this" caveats and no doubt a bit of software fiddling, but it looks fairly straightforward.

I am creating a folder in the Files area Experimenter Board for Type II DDS and Arduino NANO to house the info about the board. And I will shortly post there a PDF document with schematics and notes as well as board images. The schematics will show how the QRP-Labs module can work. Many thanks to Dick for his research and producing the compatibility diagram.

73,
Jim, N5IB

Reply to    n5ib (at) juno (dot) com    if you want an experimenter board(s)

 


Re: Xtal filter bandwidth

DuWayne Schmidlkofer
 

It was patented by TenTec in 1988  (US patent  #5051711) commonly known as the Jones filter after the designer.  It is used in many of the TenTec transceivers.
Also used in several of the Elecraft transceivers and other manufactures as well as in many homebrew QRP transceivers.  There is quite a bit of information on these types of filters if you search for variable bandwidth crystal filters. The circuit in the patent document is pretty close to what is commonly used, except that most implementations use a fixed resistors instead of the variable resistor that allows tailoring the bandpass shape.  The only problem I remember reading about is that along with the bandwidth, the center frequency also changes slightly.  Somewhere I read about a slightly different circuit that keeps a constant center frequency when the bandwidth is changed, unfortunately I can not find the article at this time.
DuWayne KV4QB

On 9/14/2015 6:36 PM, Will zl1tao@... [PHSNA] wrote:
 


Would it be practical to use varicap diodes to vary bandwidth of xtal
filters? Instead of using fixed value caps it is obviously possible to
replace or use in parallel with fixed capacitor between xtals to ground.

However would the low Q of varicaps and or the resistor used to feed the
DC to them upset the Q too much. Also would it effect the termination
impedances so that the matching was not matched.

Cheers,
Will



Re: Xtal filter bandwidth

William Kimber
 

Thanks Nick,

Didn't expect I would have been first to think of idea.

Cheers,
Will


On 15/09/15 10:41, Nick Kennedy kennnick@... [PHSNA] wrote:
 
Jim Kortge K8IQY did that pretty effectively in his famous 2N2/40 transceiver.  You can check it out here.  Not sure about the termination effects.



73--

Nick, WA5BDU


On Mon, Sep 14, 2015 at 5:36 PM, Will zl1tao@... [PHSNA] <PHSNA@...> wrote:
 


Would it be practical to use varicap diodes to vary bandwidth of xtal
filters? Instead of using fixed value caps it is obviously possible to
replace or use in parallel with fixed capacitor between xtals to ground.

However would the low Q of varicaps and or the resistor used to feed the
DC to them upset the Q too much. Also would it effect the termination
impedances so that the matching was not matched.

Cheers,
Will




Re: Xtal filter bandwidth

Nick Kennedy
 

Jim Kortge K8IQY did that pretty effectively in his famous 2N2/40 transceiver.  You can check it out here.  Not sure about the termination effects.



73--

Nick, WA5BDU


On Mon, Sep 14, 2015 at 5:36 PM, Will zl1tao@... [PHSNA] <PHSNA@...> wrote:
 


Would it be practical to use varicap diodes to vary bandwidth of xtal
filters? Instead of using fixed value caps it is obviously possible to
replace or use in parallel with fixed capacitor between xtals to ground.

However would the low Q of varicaps and or the resistor used to feed the
DC to them upset the Q too much. Also would it effect the termination
impedances so that the matching was not matched.

Cheers,
Will



Xtal filter bandwidth

William Kimber
 

Would it be practical to use varicap diodes to vary bandwidth of xtal
filters? Instead of using fixed value caps it is obviously possible to
replace or use in parallel with fixed capacitor between xtals to ground.

However would the low Q of varicaps and or the resistor used to feed the
DC to them upset the Q too much. Also would it effect the termination
impedances so that the matching was not matched.

Cheers,
Will


Re: Last call for experimenter boards

N5IB
 

My apologies to the group. I forgot to put my direct e-mail on the "last call", so a bunch of replies to the group have shown up.

Reply to    n5ib (at) juno (dot) com    if you want an experimenter board(s)

BTW - a schematic is in the works... it'll be a day or so... with maybe a new wrinkle for an application...

Jim, N5IB


---In PHSNA@..., <n5ib@...> wrote :
Consider this the last call for pre-orders of the experimenter boards.
Look in Files for

 "DDS Type II and Arduino NANO Experimenter Board.pdf"

 to see the layout as it exists now. I'll probably order them the first of next week. So far there are 80 requests
Should be $5.00  each, postpaid CONUS, about $7.00 for DX.

That file is the only info posted, no schematic was even drawn... its mostly just routing pins to break-out pads - just as easy to follow on the layout.



Re: Programmable Attenuator and Splitter/Combiner boards

Gary Winblad
 

Did this project ever take off?

Did anyone else try the Peregrine PE4302 attenuator chips??

My lab needs attenuators..  Was thinking it would fit into my
PHSNA box..   Any thoughts?

73,
Gary
WB6OGD


Re: Playing with Type II DDS and NANO

N5IB
 

There's enough interest (see the Poll) to order at least a batch of 40 of the experimenter boards.
Looks in the Files for "DDS Type II and Arduino NANO Experimenter Board.pdf" for details
This is the "tentative, proposed, final" layout  :^))

Basically it's a Type II DDS to Arduino NANO lashup with lots of lines brought out to play with.
And you get an attenuator and low pass filter layout as lagniappe.

I can offer them for $5.00 postpaid to a CONUS address, about $7.00 to a DX address.

To get a firm count, send your "pre-orders"     off-list   to n5ib (at) juno (dot) com
Send no money at this time

It will be 3 to 4 weeks before I have them in hand to send out.

73,
Jim, N5IB

PS. I have two or three each of the DDS60/NANO PHSNA, Crystal Test Fixture, and Low Pass Filter boards remaining.



Re: DDS Module is not functioning

John King
 

That was a very logical guess, Jim.  However, I could not find any errors of the type mentioned, even after going over the module with a 10X jeweler's loupe.  So, I am proceeding with the next step and ordering an AD9851.


John, W5IDA


Re: Playing with Type II DDS and NANO

DuWayne Schmidlkofer
 

The Si5351 is a very nice little chip for many purposes, its main drawback for use in the PHSNA is that its output is a square wave instead of the sine wave from the AD985x.  Ashar Farhan used a si570 in his SWEEPERINO  http://hfsignals.blogspot.in/p/sweeperino.html  He explains a little about watching out for harmonics because of the square wave. 
I used the si5351 for several projects and really like it.   One of the first was a simple antenna analyzer, and it appeared that I was getting some responses that I think were related to the square wave from the 5351. I have a little about them on my blog KV4QB.blogspot.com  also a recent VFO  I added to a Frog Sounds CW transceiver.  That VFO board with its little OLED display makes a nice module to experiment with.
I recently found an antenna analyzer using the si5351 that takes care of the harmonic problem.  http://www.iw2ndh.com/  He uses two of the clock outputs of the 5351.  One at the test frequency, and the other with an IF offset that feeds a mixer going to a simple crystal filter before the log detector.  This should eliminate any harmonic response getting to the log detector.
One of my ongoing projects is to expand on that design with a beefed up crystal filter at a lower frequency.  I hope to be able to combine the functions of a Signal Generator, SNA, Antenna Analyzer and Measurement Receiver into one instrument
DuWayne KV4QB

On 9/5/2015 9:45 AM, jab3739@... [PHSNA] wrote:
 
Hi Jim,  What about using the Si5351.  Check out 

 


http://qrp-labs.com/synth.html

 

 would this work for the PHSNA?

john kg9dk










Re: Playing with Type II DDS and NANO

John KG9DK
 

Hi Jim,  What about using the Si5351.  Check out 

 


http://qrp-labs.com/synth.html

 

 would this work for the PHSNA?

john kg9dk









Playing with Type II DDS and NANO

N5IB
 

A project that has been back-burnered for quite a while is heating up. I've been wanting to use what we've learned here with the PHSNA and apply it to some other projects. I've been planning to do a 60 meter transceiver, using the DDS modules and either a NANO or ProMini. Rather in the fashion of the Dave Benson design that was in the 2006 Handbook.

So today I made up a little carrier board to marry the NANO and the DDS in as small a footprint as possible. Turns out, with some tedious fiddling, they can be piggy backed. The clearances are tough to do with a home brew single sided board, but would be a piece of cake for a board house product.

I posted an Album in the Photos section showing what I did. This is NOT a new PHSNA, or even a finished device of any sort. It's just an experimental platform for play. The DDS control lines are tied to the NANO (had to change pin assignments in the software to accommodate the most straightforward layout), The two sinewave outputs are brought out  to a transformer and a load resistor, there is a 5 V regulator, pads for a reset switch,and a bunch of the unused lines are brought out to pads to play with.

The key is to use the little machined pins as the header on the NANO, then a conventional header strip on the DDS. To make a slightly taller socket to receive the DDS's pins I took a right-angled header socket and straightened the pins, then did not seat them flush against the board before soldering. If the DDS is not quite seated all the way into the socket, the bottom of the DDS module clears the USB connector housing on the NANO.  A regular header socket can probably be used if the machined pins can be inserted into the board with the body of the pin in the hole, rather than just tips. But that is too fine for home-brew work.

Anyway, the one I made is all I need for the time being, But it occurs to me that others might want to play in the same sandbox. I'm willing to get a few of these gadgets made if there is interest. I'd guess if I got a batch of 20 they'd cost $3 to $4 postpaid CONUS.

I'm trying out the "insert a poll question in the message" to try to get an informal gauge of interest.

73,
Jim, N5IB





Re: DDS Module is not functioning

William Kimber
 

HI John,

I'm with Jim on this.   A dry joint or possibly a very small bead of solder  shorting traces or pins on DDS chip.  Hope its not the module.

Cheers,
Will

On 01/09/15 05:09, n5ib@... [PHSNA] wrote:
 

Notice that the D7 pin is adjacent to a ground pin, and the W-CLK is on the other side of the D7.
Perhaps the plug/unplug cycles have messed up something in the area of the pins.Maybe stirred up a solder splash that creates a short. Do a resistance check to ground, inspect under high magnification, and reflow the solder joints in that area.

Jim, N5IB




---In PHSNA@..., wrote :

Jim:


Did some more testing on the Arduino and main board, trying to replicate the pulses shown in your photos on this topic.


I found that, with the AD9851 pulled from the main board, the pulses acted pretty much the same as your photos and had levels of about 5 v.  From that, I conclude that the Arduino is probably working as it should be.


I then replaced the AD9851 and powered it up.  At that point, I found that the D7 and W-CLK lines had multiple pulses as before but the levels on these lines were only around 0.2 v.  My guess is that something is holding these two lines to a low level.


Next step seems to be to try a new AD9851, unless you can think of another explanation.



Thanks for the help.


John, W5IDA


1061 - 1080 of 3088