I'll have to look and see which Si5351 lib I'm using but I get the 12MHz out. However, do you know of any reason not to switch CLK2 for CLK1?
Thanks!
toggle quoted message
Show quoted text
On 6/26/2017 9:29 AM, Vince Vielhaber wrote: Actually the VFO uses CLK2. I'm also building up a second one for mods
and the first mod is my own VFO which utilizes both CLK2 for the VFO and
CLK0 for the BFO. Odd thing tho, I couldn't get 12MHZ out of CLK0 with
the si5351 library that the Raduino uses. Switching to Pavel's library
solved that problem tho. My guess is because the other library uses PLL-A
for CLK0-2 and PLL-B for CLK3-7. The problem is the si5351A only has
CLK0-2 so that library sticks us with only PLL-A. Pavel's doesn't do that
- hence his 2 of 3 rule.
Vince.
HI All,
I've been working on putting together another BITX40. I didn't leave
myself enough room in the old lashup for mods and additions. This time I
decided to use SMA connectors for all the RF, VFO/BFO/RFOUT. Nice to
have real fittings instead of clips. Anyway, as I route the new wiring
it would be more convenient to switch the BFO to CLK0 and the BFO to
CLK1. Then I could avoid having the coax cross as it goes to the board.
I seem to remember that there is some reason that the VFO was on CLK1,
board cross talk maybe or something. Anyone know why that is?
Thanks!
Jonathan - KK6RPX
|
Actually the VFO uses CLK2. I'm also building up a second one for mods
and the first mod is my own VFO which utilizes both CLK2 for the VFO and
CLK0 for the BFO. Odd thing tho, I couldn't get 12MHZ out of CLK0 with
the si5351 library that the Raduino uses. Switching to Pavel's library
solved that problem tho. My guess is because the other library uses PLL-A
for CLK0-2 and PLL-B for CLK3-7. The problem is the si5351A only has
CLK0-2 so that library sticks us with only PLL-A. Pavel's doesn't do that
- hence his 2 of 3 rule.
Vince.
toggle quoted message
Show quoted text
HI All,
I've been working on putting together another BITX40. I didn't leave
myself enough room in the old lashup for mods and additions. This time I
decided to use SMA connectors for all the RF, VFO/BFO/RFOUT. Nice to
have real fittings instead of clips. Anyway, as I route the new wiring
it would be more convenient to switch the BFO to CLK0 and the BFO to
CLK1. Then I could avoid having the coax cross as it goes to the board.
I seem to remember that there is some reason that the VFO was on CLK1,
board cross talk maybe or something. Anyone know why that is?
Thanks!
Jonathan - KK6RPX
--
Michigan VHF Corp.
|
Actually that's what I was referring to. It's not broken, it's turned
off. Someone trying to use %f will consider it broken. As I stated,
there is a way to turn it on but I never got it to work.
Vince.
toggle quoted message
Show quoted text
Sprintf(%f) and printf(%f) are both non-operative in the Arduino IDE.
Using them will not throw an error in compiles...they just don't do
anything
in run-time. This seems to be a built-in trap for programmers who are
used
to having the full conversion capability of C and C++.
Other things like decimal, octal, etc. do work as expected. It is only
the conversion of float to text that is broken.
_._
On Sun, Jun 25, 2017 at 8:18 PM, Vince Vielhaber <vev@...> wrote:
A year or so ago someone on the arduino forum told me that sprintf is
there but turned off to conserve memory. They told me what to do to get
it
to work but I never could get it to.
There's a package for formatting string buffers called PString, but I
don't see it being as much use as a simple sprintf or snprintf.
Vince.
On 06/25/2017 09:27 PM, Arv Evans wrote:
Mark and Dr. Fred
Unless it has been fixed in the past few months, the built-in Arduino.h
does not
implement sprintf(%f). It does not block...it just does nothing. This
is a long-
standing bug in the Arduino IDE that the IDE developers do not see as a
problem.
Example of the problem:
|chartemperature[10];floattemp =10.55;sprintf(temperature,"%f
F",temp);Serial.println(temperature);|
-float-not-formatting
Arv K7HKL
_._
--
Michigan VHF Corp.
--
Michigan VHF Corp.
|
|
|
HI All,
I've been working on putting together another BITX40. I didn't leave myself enough room in the old lashup for mods and additions. This time I decided to use SMA connectors for all the RF, VFO/BFO/RFOUT. Nice to have real fittings instead of clips. Anyway, as I route the new wiring it would be more convenient to switch the BFO to CLK0 and the BFO to CLK1. Then I could avoid having the coax cross as it goes to the board. I seem to remember that there is some reason that the VFO was on CLK1, board cross talk maybe or something. Anyone know why that is?
Thanks!
Jonathan - KK6RPX
|
Analog Alley: pos temp coefficient trimmer cap
does any body know how to find POSITIVE temp coefficient trimmer caps suitable for the VFO ???, e.g. who makes them. I would like to parallel one with a negative temp coefficient trimmer in my VFO to minimize drift. (Yes I know the raduino and similar are available and I have already put npo caps everywhere and already have very little drift right now but there is a slow creep that I would like to neutralize into just a wobble)
Thanks!
jer aa1of
|
On Sun, Jun 25, 2017 at 02:27 pm, Jerry Gaffke wrote:
"The grounded end of C130 and D7 should instead be connected to K1-9, so they are across the relay coil."
Hi Jerry, even though I have been following most of this stuff and understand most of it, I have forgotten the reference to the above statement. ?Was this to stop that pause and click when you hit the transmit button? ?If not what is is for, and how do you stop that pause.? Thanks Andy
|
Sprintf(%f) and printf(%f) are both non-operative in the Arduino IDE.
Using them will not throw an error in compiles...they just don't do anything
in run-time.? This seems to be a built-in trap for programmers who are used
to having the full conversion capability of C and C++.
Other things like decimal, octal, etc. do work as expected.? It is only
the conversion of float to text that is broken.
_._
On Sun, Jun 25, 2017 at 8:18 PM, Vince Vielhaber <vev@...> wrote: A year or so ago someone on the arduino forum told me that sprintf is there but turned off to conserve memory.? They told me what to do to get it to work but I never could get it to.
There's a package for formatting string buffers called PString, but I don't see it being as much use as a simple sprintf or snprintf.
Vince.
On 06/25/2017 09:27 PM, Arv Evans wrote:
Mark and Dr. Fred
Unless it has been fixed in the past few months, the built-in Arduino.h
does not
implement sprintf(%f).? It does not block...it just does nothing.? This
is a long-
standing bug in the Arduino IDE that the IDE developers do not see as a
problem.
Example of the problem:
|chartemperature[10];floattemp =10.55;sprintf(temperature,"%f
F",temp);Serial.println(temperature);|
Arv? K7HKL
_._
--
? Michigan VHF Corp.? ?? ?
? ? ? ? ? ? ? ? ? ? ? ? ?
|
|
|
toggle quoted message
Show quoted text
On Jun 26, 2017 1:12 AM, "Ashhar Farhan" < farhanbox@...> wrote: the si5351 has a stated output impedance of 80 ohms. this means that a 33 ohms resistor in series with a 50 ohms should do it. however, the diode ring mixer is not a strong 50 ohm impedance. this puzzles diode mixer needs to be DRIVEN by a 50 ohm source. which means it is best to place a 6db pad on the LO port. hence, the best way is to drive use a 33 ohm series resistor between the si5351 and a 6db pad. drive the diode mixer from the other end of the pad. program the Si5351 to 8 ma. pray to his holiness G0UPL that it works. - f
|
|
|
Hi Arv. Unless it has been fixed in the past few months, the built-in Arduino.h
does not implement sprintf(%f). I just checked, and I was indeed using snprintf(). However, I have been using the Visual Micro Arduino plugin for Visual Studio. The Arduino IDE was driving me crazy. 73 - Mark N1VQW
|
It's effectively used in VK3YE's "Beach 40" (two of 'em, driven by a 2N2222!).
I've used the BD139 with it's complement BD140 in an audio amplifier. Works a treat...
?
Mike Y, KM5Z
Dallas, Texas USA
|
Just received my Mega 2560 Pro (embed) CH340G in the mail. Was happy until I lined it up with the W8TEE board and it don't fit. 1 whole row of pins out. Looks like I have ordered the wrong one 
|
Hello Farhan
I use the BD135, BD137 and BD139 in many experiments, all these are OK for frequencies up to 30MHz, but I use from Phillips or Motorola all others dont have the same perform in frequencies in frequencies above 20MHz.? ...Recently I? bought BD139 from China but they do not have the same features as the BD139 (they have a PH mark) of those brands.
Some americans hams are using the 2SC5706 ...I bought they also, but I dont made experiments with.
For 14MHz? the 2SC1173 or the BD135/ 137/139 are OK.
73 from py2ohh miguel
|
Hi,
I'm use it in last 4 cw homebrew transceivers. 1 transistor gives 1/2 Watts in output. It works well to
10MHz, Upwards its power drops to 1/2 (but this may also be due to poor tuning between the transceiver and the antenna). They are Burns quickly in bad SWR conditions (over ~ 1:3). It is good to have a zener diode at the exit to protect transistor.
73!
On Monday, June 26, 2017 11:49 AM, Ashhar Farhan <farhanbox@...> wrote:
has anyone used bd139 as power amplifier? how does it perform at 14 mhz and beyond?
|
has anyone used bd139 as power amplifier? how does it perform at 14 mhz and beyond?
|
toggle quoted message
Show quoted text
On 26 Jun 2017 9:40 a.m., "Dr Fred Hambrecht" < AAR4MI@...> wrote: Thanks to you, Arv, and Mark for all the input. I should have your book on Monday. My kingdom for a BASIC CHR$( ) . Now if someone has developed an Arduino robot that smacks you in the head when you forget the semicolon¡ ? v/r Fred W4JLE ? ? Try this: it avoids using the String class, which is a memory hog.
|
the si5351 has a stated output impedance of 80 ohms. this means that a 33 ohms resistor in series with a 50 ohms should do it. however, the diode ring mixer is not a strong 50 ohm impedance. this puzzles diode mixer needs to be DRIVEN by a 50 ohm source. which means it is best to place a 6db pad on the LO port. hence, the best way is to drive use a 33 ohm series resistor between the si5351 and a 6db pad. drive the diode mixer from the other end of the pad. program the Si5351 to 8 ma. pray to his holiness G0UPL that it works. - f
On 26 Jun 2017 7:30 a.m., < bruce@...> wrote: Hi:
I am doing a scratch-built BITX, shown below.? The receive side just started working - no PA block yet. If anyone with a trained eye can see obvious construction problems so far please let me know. :-)
But my real question relates to the VFO drive level.? I am using an Si5351/A for the VFO and the BFO.? From my reading it seems like a 1N4148 diode ring mixer requires about 7 dBm drive on the LO port.? The Si5351/A puts out a lot more than that.? In the schematic of the BITX-40 module I have it looks like there are amplifier stages after the DDS input plug on the board.? So all of this makes me wonder: what is the right power level to drive diode ring mixer?? Would it be OK to just connect the Si5351/A clock output directly to the LO port on the mixer?? Should it be amplified?? Padded?
Thanks in advance.
73s,?
Bruce KC1FSZ
|
I think 7dBm would apply to a ring of schottky diodes, not the 1n4148's.
From a photo caption: ??
"Double balanced high level frequency mixer Mini-Circuits SBL-1 with four Schottky diodes. LO level +7 dBm (1.41 Vp-p)"?
You might do well to take a look at the uBitx: ?
Jerry, KE7ER
toggle quoted message
Show quoted text
On Sun, Jun 25, 2017 at 07:00 pm, <bruce@...> wrote:
From my reading it seems like a 1N4148 diode ring mixer requires about 7 dBm drive on the LO port.
|
