Date   
Re: CLK0,/CLK1 - VFO/BFO

JuanCarlos
 

Hi Mike, the best for you
I have done a module you can use or not, it is a flexible option to asembly the PCB board.
If you complete the module you do not have to do anything extra, if you do not want to work with the module separate you just only use the Synthesizer board only.
please check it out

Qrv's
73's Jc



Qrv's, 73's

Mr.Juan Carlos Berberena Glez BSc.
WJ6C ex/CO6BG


“If you have a penny and I have a penny and we exchange pennies, you still have one cent and I still have one cent.  But if you have an idea and I have an idea and we exchange ideas, you now have two ideas and I now have two ideas.” 

2017-06-27 10:42 GMT-04:00 Michael Hagen <motdog@...>:

Hey, I have a Board I designed and have extras.  It has 2 4 Pin headers, I2C one side Outputs and ground on other.

2 Layer with lots of ground plane.  No coupling caps, short and direct lines on outputs.  Has a 3.3 Volt Regulator AND Level

Shifting for the SI Part.  I don't know why Raduino does NOT have Level Shifting.  So this needs ONLY +5V input.

I made a nice Signal Generator from one and a Nano.

Anyone interested email me off this group.

MotDog@...


73s

Mike, WA6ISP


On 6/27/2017 6:32 AM, Vince Vielhaber wrote:
Jerry,

Fascinating. Thanks for writing that up. I need to look closer at the
Si5351.

Jonathan
Adafruit has one all set up on a board for about $8, but their shipping is
insane.  Check ebay for the same one, I think from one or more of their
resellers, and shipping is only $2.90.  I bought 5 of 'em.

Vince.





Re: Analog Alley: pos temp coefficient trimmer cap

 

Jerry!

Wrong thread right thoughts!

How about digitally feeding an analog VFO with voltage and correcting like PLL.I haven't succumbed to temptations of the Radiuno as yet!
Don't get me started as my Sencond language was C .

I wonder if anyone of you used my program called PAX written in assembly MASM - 12Kb with 10K lines of code!

Raj


At 27-06-2017, you wrote:
Darn,
Wrong thread.
Wrong Jerry.
Jerry


On Tue, Jun 27, 2017 at 07:35 am, Jerry Gaffke wrote:
Raj,

Nothing.  As usual, just thinking about it.  Then I'll get bored and move on to something else.   Though at some point I'd like to try an encoder with tactile feedback, use shuttle tuning as described by Don Cantrell.  Not yet sure if I'll like using it, but I do like the thought of going from 1hz to 10mhz step size without having to do all that spinning.
Or maybe I'll take that old WWII surplus Arc5 tuning cap with the very nice gear drive, have the Nano read capacitance somehow.  Kind of heavy, should give the rig a certain gravitas.

Jerry
. . .

 

On Tue, Jun 27, 2017 at 04:42 am, Raj vu2zap wrote:
What are you using for your tuning. I am using a Bournes 100K 10T and that is stable. Higher value will give a smoother tuning.

Re: CLK0,/CLK1 - VFO/BFO

Michael Hagen
 

I also have a Complete Raduino Board I designed.  It has lots of features better than original.

I2C connector.

Rotary Encoder connector with Pull-ups and De-Bounce Caps.

Much better PS conditioning.

Nano mounts in Sockets and on Back for easy removal.

USB faces to edge of box side.

Contrast Pot accessible.

All Arduino outputs brought out to connectors.

Level Shift for SI part to operate per specification.

Completely compatible to Original Raduino .  Fits LCD perfectly.

Here is a Picture.


73, Mike, WA6ISP


On 6/27/2017 8:18 AM, Juan Carlos Berberena Glez wrote:
Hi Mike, the best for you
I have done a module you can use or not, it is a flexible option to asembly the PCB board.
If you complete the module you do not have to do anything extra, if you do not want to work with the module separate you just only use the Synthesizer board only.
please check it out

Qrv's
73's Jc



Qrv's, 73's

Mr.Juan Carlos Berberena Glez BSc.
WJ6C ex/CO6BG


“If you have a penny and I have a penny and we exchange pennies, you still have one cent and I still have one cent.  But if you have an idea and I have an idea and we exchange ideas, you now have two ideas and I now have two ideas.” 

2017-06-27 10:42 GMT-04:00 Michael Hagen <motdog@...>:
Hey, I have a Board I designed and have extras.  It has 2 4 Pin headers, I2C one side Outputs and ground on other.

2 Layer with lots of ground plane.  No coupling caps, short and direct lines on outputs.  Has a 3.3 Volt Regulator AND Level

Shifting for the SI Part.  I don't know why Raduino does NOT have Level Shifting.  So this needs ONLY +5V input.

I made a nice Signal Generator from one and a Nano.

Anyone interested email me off this group.

MotDog@...


73s

Mike, WA6ISP


On 6/27/2017 6:32 AM, Vince Vielhaber wrote:
Jerry,

Fascinating. Thanks for writing that up. I need to look closer at the
Si5351.

Jonathan
Adafruit has one all set up on a board for about $8, but their shipping is
insane.  Check ebay for the same one, I think from one or more of their
resellers, and shipping is only $2.90.  I bought 5 of 'em.

Vince.






Re: CLK0,/CLK1 - VFO/BFO

Jerry Gaffke
 

Michael,

The Si5351 runs at 3.3v, the Nano at 5.0v
The Nano drives SDA and SCL as open collector outputs, pulled high to 3.3v by external resistors.
So the Si5351 is fine with both the low (0v) and high (3.3v) states of the SDA and SCL lines.
Figure 34.25 of the ATMega328P data sheet shows that at Vcc=5v, the input threshold to read a 1
on the incoming SDA signal is at around 2.6v, so that works too.

The pullup resistors have to charge any capacitance in the SDA and SCL lines for them
to get up beyond 2.6v, so that may not work on reads if the i2c bus runs at max speed.
Special level shifting parts would be a reasonable addition for a conservative design.  
But no, they are not really needed, and the Bitx40 is going for maximum performance
with a minimum of parts. 

In the case of the Si5351, the Nano never has to read any i2c registers,
though some libraries may do so just to verify that stuff is working.
If the Nano is only doing writes to the Si5351, this is a slam dunk.

Jerry, KE7ER



On Tue, Jun 27, 2017 at 07:43 am, Michael Hagen wrote:

I don't know why Raduino does NOT have Level Shifting.

Re: CLK0,/CLK1 - VFO/BFO

Jerry Gaffke
 

Nice!
Are you selling it, or have the bare boards available?
Would be handy to have a quick local source for a Raduino when we fry one.
Jerry


On Tue, Jun 27, 2017 at 08:42 am, Michael Hagen wrote:

I also have a Complete Raduino Board I designed.  It has lots of features better than original.

 

Re: CLK0,/CLK1 - VFO/BFO

Michael Hagen
 

I still don't like NOT level shifting.  I don't even see clamp diodes to 3.3V for the over drive.

But not using it saves parts and assembly, and seems to work OK.

Yes I have extra RaduinoX PCBs.  X for Extra.  Most of them populated with everything but SI Part and Crystal.

It is really nice, I got a signal generator built out of one with a rotary encoder.  4 Line LCD  10KHz to 30 MHz.

I am still playing with values for my Encoders, for now 10K pullups and 0.01uf caps?

All fits in a small plastic box.


Yes, I just counted.  I got 4 RaduinoX boards with everything but connectors, SI, and Crystal.

They have been powered up and voltages checks.

A couple more with connectors and tested with Nano and LCD.

I can get more, If interest is there.  I am retired on SS, so I am not going anywhere, hopefully!

I got lots of soldering time.

email me at MotDog@...

73's

Mike, WA6ISP


On 6/27/2017 9:00 AM, Jerry Gaffke via Groups.Io wrote:
Nice!
Are you selling it, or have the bare boards available?
Would be handy to have a quick local source for a Raduino when we fry one.
Jerry


On Tue, Jun 27, 2017 at 08:42 am, Michael Hagen wrote:

I also have a Complete Raduino Board I designed.  It has lots of features better than original.

 


Re: CLK0,/CLK1 - VFO/BFO

Jerry Gaffke
 

Mike,

Thanks.  The need for a Raduino comes up often enough in this forum.

Just to reassure those using the hfsigs Raduino, I see no real need for level shifting or clamp diodes.
With our firmware the Nano only drives those lines low, does not drive them high.

However, if firmware were to drive those i2c lines high from the Nano's Vcc=5v, they could source
30 or 40ma into the Si5351 i2c pins, all that current going through protection diodes inside
the Si5351 to the Si5351 3.3v Vcc rail, possibly blowing those IO cells.  So be aware
of that if downloading questionable firmware.

A conservative hardware design would do as Mike has done.
A $0.02USD solution for hfsigs might be to instead add 100 ohm series resistors between Nano and Si5351,
limiting the current to something less than (5v-3.3v)/100 = 17ma.  Likely more on the order of 10ma max
due to voltage drops through Nano output drivers and Si5351 protection diodes.
The Si5351 does not seem to spec a maximum current into SDA and SCL, but should survive 10ma. 

Jerry
  


On Tue, Jun 27, 2017 at 09:16 am, Michael Hagen wrote:
I still don't like NOT level shifting.  I don't even see clamp diodes to 3.3V for the over drive.

Re: CLK0,/CLK1 - VFO/BFO

Jerry Gaffke
 

Mike,
You will have to spell that email address out.
GroupsIO clips it to prevent spambots from sending you truckloads of requests for bank passwords and such.

Jerry, KE7ER


On Tue, Jun 27, 2017 at 09:16 am, Michael Hagen wrote:
email me at MotDog@...

Re: CLK0,/CLK1 - VFO/BFO

Pavel Milanes Costa <pavelmc@...>
 

El 27/06/17 a las 12:16, Michael Hagen escribió:

I am still playing with values for my Encoders, for now 10K pullups and 0.01uf caps?

I'm satisfied with this rotary lib, simple, small and has all the bell and whistles:

https://github.com/brianlow/Rotary/

* support full/half step encoders
* pool or interrupt driven (poll any pins can be used, interrupts forces 2&3)
* debounce logic in software (a 1nF/10nF to ground helps a lot in RF environments)
* correct handling of inversion of the movement in mid of a step
* noise immunity
* can enable pullups internally (no need of extra 10k resistors)
* really high speed rotation detection

Jus saying... 73 de Pavel CO7WT.

Re: CLK0,/CLK1 - VFO/BFO

Pavel Milanes Costa <pavelmc@...>
 


El 26/06/17 a las 21:02, K5ESS escribió:

Page 16 of the Si5351 shows how you can connect two Si5351s to the same I2C bus.

Mike

K5ESS


Please provide a link to the specific document... thanks.

Re: CLK0,/CLK1 - VFO/BFO

Jerry Gaffke
 

He's referring to the bottom of page 16 in the Si5351 datasheet:  https://www.silabs.com/documents/public/data-sheets/Si5351-B.pdf
However, page 28 shows that there is no A0 pin on our Si5351A in the MSOP8 package.
Only the Si5351A in the QFN20 package shown on page 25 has the A0 pin, harder to get and more expensive.

Jerry, KE7ER


On Tue, Jun 27, 2017 at 10:53 am, Pavel Milanes Costa wrote:
El 26/06/17 a las 21:02, K5ESS escribió:

Page 16 of the Si5351 shows how you can connect two Si5351s to the same I2C bus.

Mike

K5ESS


Please provide a link to the specific document... thanks.

BITX40v3 only transmitting carrier?`

lfstindall@...
 

Hi all,

I just finished building my antenna system and, after connecting my newly assembled BITX40, I tried transmitting on 7.175 MHz (the freq. to which my antenna is tuned). When tuning to this frequency on my commercial shortwave receiver, however, I hear only carrier - a BEEEEP, as if I were transmitting CW! Also, the speaker connected to the BITX40 squeals for an instant when I hit PTT.

Anyone have any experience with similar issues?

Best,
Leo

13.4 V power supply

KC8WBK
 

I get a whine in the speakers when I try to power the BITX40 in my van, which has a solar system charging batteries at 13.4 Volts.

How can I solve this problem?

Re: 13.4 V power supply

Clark Martin
 

Either filter the incoming power or get a better solar charge controller.

Clark Martin
KK6ISP

On Jun 27, 2017, at 1:36 PM, KC8WBK via Groups.Io <cruisenewsnet=yahoo.com@groups.io> wrote:

I get a whine in the speakers when I try to power the BITX40 in my van, which has a solar system charging batteries at 13.4 Volts.

How can I solve this problem?

antenna

terry hughes
 

this topic would be for any tx but i have a bitx40
i set up a 40 m dipole according to the calculated length ie (150x0.98)/7.1 but the swr at the low freq end was bad and at the high freq end it was terrible
so i chopped a bit off which improved the swr. I have now got a good swr from 7.0 to 7.2

so why is it now much shorter than the formula length.

maybe because it is only about 8 feet above ground

any antenna experts out there know the answer

terry GM4DSO

Re: 13.4 V power supply

Andrew Krause
 

Without knowing exactly everything about your setup, I'm going to jump to the charge controller being the source of the whine. Even pricier ones tend to use a bucking power supply for DC-DC conversion, and those are noisy as sin. (They're also inefficient for solar power conversion.) The quick solution is to use a different power source while your batteries are charging, like a 12v battery pack. That's probably not the optimum solution, so the second recommendation is going to to install a simple DC noise filter. You can get them from brands like Pyramid and Metra on Amazon for under $15, and they work well enough. If you're the hands-on type, you can build one. A largish (470uf) cap in parallel, and a torroidal coil in series often works well enough. This is how I got my Cobra 29 LTD to stop buzzing when my engine was running. 


Andrew Krause
General Class Amateur Radio License: KM4ZJO
andrew.krause@...
(404) 732-2369




On Tue, Jun 27, 2017 at 4:36 PM, KC8WBK via Groups.Io <cruisenewsnet@...> wrote:
I get a whine in the speakers when I try to power the BITX40 in my van, which has a solar system charging batteries at 13.4 Volts.

How can I solve this problem?


Re: CLK0,/CLK1 - VFO/BFO

Michael Hagen
 

MotDog@...

MotDog at Verizon the phone Company and dot net!

I wonder what clipped it off?


On 6/27/2017 10:26 AM, Jerry Gaffke via Groups.Io wrote:
Mike,
You will have to spell that email address out.
GroupsIO clips it to prevent spambots from sending you truckloads of requests for bank passwords and such.

Jerry, KE7ER


On Tue, Jun 27, 2017 at 09:16 am, Michael Hagen wrote:
email me at MotDog@...

Re: antenna

John P
 

I'm not an expert, although I play one on the internet! My guess is that it has to
do with the height above ground. I'm having a similar problem trying to tune
a hamstick dipole in my attic. Unfortunately the attic floor is insulated with
foil backed insulation, and no matter what length I make the antenna, it only
wants to resonate at 6.0 MHz. Changing the length does not significantly change
the resonance point, but does change the SWR dramatically.

--
John - WA2FZW

Re: antenna

Paul Artman
 

I am not an expert either, but isn't there a distinction between physical lenth and electrical/electronic lenth?

Re: antenna

Michael Hagen
 

You can use an antenna modeling program, I think everything matters.  Height and Slope.

You might find a free version of NEC or something?

Mike, WA6ISP


On 6/27/2017 3:02 PM, Paul Artman via Groups.Io wrote:
I am not an expert either, but isn't there a distinction between physical lenth and electrical/electronic lenth?