Re: BitX40 Builders Fest opportunity (edit to:) Modders who have wares, boards, add ons, cases, what have you, BitX family
On Tue, Dec 19, 2017 at 08:27 am, Jack Purdum wrote:
Hi Craig:
?
?I'm starting to think I won't put a speaker into the unit, but will probably have an external one handy.
That is what I have done. ?I have a small external communications speaker, I can place it somewhere comfortable to hear, or I can drop the audio level and the noise and hold it against my ear, or I can unplug it and plug in the head phones.. Then with these utility builds that I do, I am thinking of in future builds incorporating a place within the case to place the speaker, mic, dc input cable, etc, when not in use, or to provide an attachment arrangement so that everything is in its place as one unit. ?Not for looks, but for the sake of keeping track of everything, as these builds travel with me and with others to every local builders event as well as every local operating event. 
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Re: Help! I think I may have just ruined my 9 year old's Chanukah
Double and triple rats!!!
Before I hurried after work, I was able to take a plain old 12 inch insulated clip wire, and put some tape on the far end and drop it amidst the morass of wires near the single Crystal (BFO) in a bitx40, and connect the other end
to the center conductor of the PL 259 from an ICOM 718.
With the Raduino tuning 7.075:
1) Huge 9db over s9 signal at about 4.925
(VFO Raduino )--varies with Raduino tuning?
2) S9 big signal a few Hz off from 12 MHz (the BFO oscillator )
Both of these are being picked up basically Through capacitive coupling.
So the test techniques I've been suggesting, do apparently work. ? There may indeed be something screwy with your Raduino . ? If you could tell us whether you can hear the 12 MHz BFO signal, that would probably cinch it.?
Progress!!
Gordon.?
Sent from my iPhone
On Dec 20, 2017, at 05:45, Gordon Gibby < ggibby@...> wrote:
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Rats!!
If you didn't find the 4.925 MHz signal, looks like something there really has a problem......
I also note that you sound like you're really knowing how to hunt for things now!!! ?HOOORAY !!!
The Lm 386 that you found with the less than wonderful solder---you have been hearing some pops in the speaker so I'm guessing it is probably working, but as mentioned no harm to gently resolder those points.
Just be very careful not to bridge solder between two pins, that will make a real headache.
You have already advanced through several portions of this system: ?+V, ground, properly set the idle current; made several tests of the Raduino system which sounds like it works in straight through mode but not in phase lock loop
mode?? ?Something really screwy there because this thing multiplies 25 MHz up to about 875 MHz, and then divides it back down again through a series of divisors to come up with exactly what is wanted. ? How on earth could it make a strong 25 MHz signal, but
not anything else is really weird. ? But delving into trying to figure out a busted microchip is that where I probably want to spend the time of my life. ?If that section is busted, I would probably just replace the entire board. ?I've done some surface mount
soldering, maybe five hours of it, and it was not fun!!!
Tonight when I get home I'll check to be absolutely certain I can hear the same signals on one of mine. ? ?But at this point, I would be doing the following:
1) Slip an insulated wire from your communications receiver antenna input, near the 12 MHz single crystal area and see if you can hear the 12 MHz beat frequency oscillator which will be within a few kilohertz of 12 MHz. ?If you
can hear that signal, it proves that yet another stage works properly, and makes it look all the more damning for the Raduino board.
2) presuming that you were able to hear the BFO 12 MHz, I would probably be next switching out the entire Raduino with a different Raduino---substitution of a complete assembly--and retesting for the 4.925 MHz signal. ? Having a
second unit to swap parts back-and-forth would become pretty critical now. ? Something is definitely fishy and you've narrowed it down considerably.
That's ham radio!!!
Congrats, you've done a huge amount of detective work!
I'll let you know what I find when I look for a few signals on one of my units.
Gordon
Sent from my iPhone
On Dec 20, 2017, at 01:54, William R Maxwell < wrmaxwell@...> wrote:
The Si5351A is on the Raduino board itself. Under the LCD.? It's fairly tiny.
The LM386 is in fact the audio amplifier. No harm to be done by carefully resoldering those couple of pins, although this is a double sided plated-through board and they are probably soldered adequately on the
under surface - but check that while you are there.
Bill, VK7MX
Looking at the schematics, that appears to be LM386 - low voltage power amplifier. It also appears that the SIS chip is on the raduino itself. So, I'll look there for it. Could this power amplifier be causing this...or is it most likely the SIS chip?
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Re: Ordered the 10th, no tracking number yet
I got the same mail one week ago, no sign of it (in India!)
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At 20-12-2017, you wrote: I also ordered on the 10th. No indication about shipping so far although an email was returned saying it would be sent in the "next couple of days."
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Re: Apology in advance if dumb question - How do I know my order has been captured?
As I understood ALL uBitx to US is via Courier and to EU by post with
option courier.
I may be wrong!
At 20-12-2017, you wrote:
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But I ordered Free Shipping, came by
carrier, not US PO?
Mike
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Re: Help! I think I may have just ruined my 9 year old's Chanukah
Rats!!
If you didn't find the 4.925 MHz signal, looks like something there really has a problem......
I also note that you sound like you're really knowing how to hunt for things now!!! ?HOOORAY !!!
The Lm 386 that you found with the less than wonderful solder---you have been hearing some pops in the speaker so I'm guessing it is probably working, but as mentioned no harm to gently resolder those points.
Just be very careful not to bridge solder between two pins, that will make a real headache.
You have already advanced through several portions of this system: ?+V, ground, properly set the idle current; made several tests of the Raduino system which sounds like it works in straight through mode but not in phase lock loop
mode?? ?Something really screwy there because this thing multiplies 25 MHz up to about 875 MHz, and then divides it back down again through a series of divisors to come up with exactly what is wanted. ? How on earth could it make a strong 25 MHz signal, but
not anything else is really weird. ? But delving into trying to figure out a busted microchip is that where I probably want to spend the time of my life. ?If that section is busted, I would probably just replace the entire board. ?I've done some surface mount
soldering, maybe five hours of it, and it was not fun!!!
Tonight when I get home I'll check to be absolutely certain I can hear the same signals on one of mine. ? ?But at this point, I would be doing the following:
1) Slip an insulated wire from your communications receiver antenna input, near the 12 MHz single crystal area and see if you can hear the 12 MHz beat frequency oscillator which will be within a few kilohertz of 12 MHz. ?If you
can hear that signal, it proves that yet another stage works properly, and makes it look all the more damning for the Raduino board.
2) presuming that you were able to hear the BFO 12 MHz, I would probably be next switching out the entire Raduino with a different Raduino---substitution of a complete assembly--and retesting for the 4.925 MHz signal. ? Having a
second unit to swap parts back-and-forth would become pretty critical now. ? Something is definitely fishy and you've narrowed it down considerably.
That's ham radio!!!
Congrats, you've done a huge amount of detective work!
I'll let you know what I find when I look for a few signals on one of my units.
Gordon
Sent from my iPhone
On Dec 20, 2017, at 01:54, William R Maxwell < wrmaxwell@...> wrote:
toggle quoted message
Show quoted text
The Si5351A is on the Raduino board itself. Under the LCD.? It's fairly tiny.
The LM386 is in fact the audio amplifier. No harm to be done by carefully resoldering those couple of pins, although this is a double sided plated-through board and they are probably soldered adequately on the
under surface - but check that while you are there.
Bill, VK7MX
Looking at the schematics, that appears to be LM386 - low voltage power amplifier. It also appears that the SIS chip is on the raduino itself. So, I'll look there for it. Could this power amplifier be causing this...or is it most likely the SIS chip?
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Re: : [BITX20] uBit Build
While driving back to town I suddenly remembered CODEVIEW..
At 19-12-2017, you wrote:
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I think most of us second
Farhan's wish list. I wonder if anyone else would like a true symbolic
debugger?
Jack, W8TEE
From: Raj vu2zap
<rajendrakumargg@...>
To: [email protected]
Sent: Tuesday, December 19, 2017 8:18 AM
Subject: Re: : [BITX20] uBit Build
Farhan,
I enjoyed this post! My favorite was QuickC 2.5 with in-line assembly
code. Step, watch and break brought some lost memories back. If I
remember right I could watch some register values too!
Get well soon.
Cheers
Raj
At 19/12/2017, you wrote:
>Arduino suppresses these warnings. It is??? pity, I am a
professional programmer and I tend to work with all warnings switched on,
but i have thrown all that discipline to the wind on Arduino because the
IDE is too kludgy. I wish i could jump to a line number, I can't. i wish
i could click on an error and get to the source line, i can't. i wish i
could find and replace with a regex, it won't allow me. The world's first
editor, vi, did that 40 years ago.??
>
>Hans has a healthy disrespect for the arduino IDE, he prefers the
bare AVR compiler and editor. I am a vi and gcc guy too. However, when
are you are programming to make it hackable for others, I should use an
IDE that is easy and universally available, hence the essential pain of
Arduino IDE is upon us all. The rumour is that the IDE is derived from
Eclipse. I am awed at how much one can dumb down a very well intentioned
software into being a total dodo.??
>
>Take a look at the Microchip's IDE, have simulators with step, watch
and break! I must go now, take my pills and stop ranting...
>
>- f
?Virus-free.
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Re: In Line Resistive Terminators for Z Measurement? ?BITX Crystal Filter
Andy:
That;s all right. I misread your 2nd instance as 500 ohms, not 50 ohms,
If it is indeed 50 ohms, then a simple 1:1 transformer or LC match will suffice. That may not even be needed
as there are capacitors to isolate the circuit...I suspect it is not really 50 ohms though.
Note that the "QER" topology is not the same as the ladder filter topology. It is a variation of
the Cohn filter, but the effect of the parallel crystals at the end has the effect of greatly reducing
the passband ripple. It also changes the termination impedance of the filter somewhat. A Cohn
filter has a terminal impedance somewhere around 200 ohms. (That varies a great deal depending
on the terminations of course, but simple typical values are around 200 ohms. The QER topology changes that.
So, an ordinary Chebyshev or Butterworth filter, which is the basic design of the ladder filter, is NOT
reflected in the Cohn filter, which in turn is complicated by being a QER topology. Theoretically, Dishal
takes that into account...but only theoretically.
The net result is what you are seeing. You are assuming the filter is a Butterworth or Chebyshev, but it is not.
Perhaps the impedance match is closer to 9:1 rather than 4:1. Perhaps not. This is not exactly a simple
subject, and Dishal does not exactly account for the QER design (even though it was modified to do so;
I don't think we yet exactly understand the QER topology). What we do know is that the basic filter is
the inside ladder (or Cohn), but the parallel crystals on the end change things rather dramatically.
First, make sure that you are measuring INTO a 50 ohm impedance both at the input and output of the
filter. Second, make sure that your measuring instruments are really telling you the truth. Then
go by what you measure. You know what the outside world is putting into and taking out of the filter
(50 ohms). Then your measurements will tell you what is needed to match. You will probably have to experiment
a bit to find the "right" combination. However, even a not so good looking filter in theory, may be perfectly
acceptable to our ears. The true test is always how it really performs in our rig.
There was a fairly recent discussion on e-ham.net about directly measuring the impedance of the filter.
Google it. Also look at the various papers and files dedicated to filter design. There are lots...and they to date
still have not figured it out completely. Know that 99% or more of how the filter works is related to how closely matched
the crystals are; the other parameters are important, but the ear hardly notices the difference.
john
AD5YE
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Re: GPS for time and Maidenhead for port ops
John and others,
Thanks for your replies and comments.
These demonstrate that it is feasible and possible. Now, I need to do some research/homework and bring it all together. If you like, I’ll report it here and get feedback from the brains trust :-)
Seasons greetings to all.
73 Peter VK3TKK
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On 20 Dec 2017, at 3:22 pm, John Backo <jabac@...> wrote:
Peter:
This has already been more or less accomplished by Hans Summers and a slew
of others. See the QRPLabs website for more information.
The first thing to consider is what GPS unit you are going to use. There are a lot of them
and they vary all over the map with regard to specs. However, they all conform to the
GPS transmission. Which is the second thing to do...see what that is exactly.
Then work out a design that uses software to display what you want. The major difference
among hams is that the GPS is also used to condition and calibrate the transmission frequency
of a DDS controlled rig (as noted by Arvo).
Yes, it is easily possible and there is a lot of information around about doing just what
you want to do. Google it; you will be pleasantly surprised.
john
AD5YE
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Re: uBitx power draw variation
#ubitx
Bob,
Why are you measuring current in the negative line and not the positive line?
This would eliminate strange grounding effects as there is only one positive supply lead.
73, Alex
PA1FOX
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Re: In Line Resistive Terminators for Z Measurement? ?BITX Crystal Filter
EDIT...sorry, I'm reading 200Ω for crystal filters, not 2K.? It's only a zero. hi hi
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On Tue, Dec 19, 2017 at 11:47 pm, AndyH wrote:
Hi John,
? ?I appreciate your comments.? I agree that the first option isn't going to fly.? I saw the changes in the noise floor but at this point in my 'crystal kindergarten' I don't grok the significance of the floor.? When I'd first started (this was my 2nd crystal filter ever), I saw the glove...er...ripple and think I learned it was heavily influenced by input/output impedance.? I'd still like to find a way to measure the impedance of filters but haven't figured out how yet.
? ? In the meantime, I've learned? that I didn't gather enough information from those crystals (the holder capacitance, for a start), and I didn't put them in any sort of frequency order.? I have another set of crystals that I have properly measured and modeled in DISHAL.? DISHAL suggests the finished filter will have a 69Ω Z with a 2.5 KHz bandwidth.? We'll see.? (Is it correct to model this as an 8 crystal filter, even though the first and last are paralleled?? I hope so as that's what I'm doing... )
? ?I'm interested in how? you arrived at the 400Ω estimate - that's intriguing.? I'm also surprised that I keep hearing 2KΩ for crystal filters, yet DISHAL suggests low numbers.? Lots to learn.? ?Sleep first. ;)
? ? Best,
? ? ?Andy? (a maintainer's worst nightmare:? an operator with tools)
On Tue, Dec 19, 2017 at 08:49 pm, John Backo wrote:
That's nice, Andy. But look at what happens to your noise floor
in the third instance.
The first instance shows a peaks and lows over a 5+ dB range, perhaps a bit
too much for a good filter.
The second shows a good ripple and a pretty good noise floor. I probably would
go with that one. Note that the G3UUR 8-xtal filter has different characteristics than
those of a plain 4 or 5 xtal ladder filter. You probably should assume (from your
measurements) that the output impedance is about 500 ohms and design a transformer for
that 10:1 match. It's worth a try anyway. Remember that the impedance ratio is the square root of
the number of turns, so your turns ratio would be around SqRt(10): SqRt(1). Try it and see what happens.
john
AD5YE
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Re: uBITX How to wire key jack for paddles?
Ashhar,
The photo of the key jack in 3.3 of the wiring instructions shows the wires connected to the ring not the tip. Couldn't work out why my external keyer wouldn't key the rig as I wired according to the photo not the words.
Regards
Simon VK3ELH?
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Re: In Line Resistive Terminators for Z Measurement? ?BITX Crystal Filter
Hi John,
? ?I appreciate your comments.? I agree that the first option isn't going to fly.? I saw the changes in the noise floor but at this point in my 'crystal kindergarten' I don't grok the significance of the floor.? When I'd first started (this was my 2nd crystal filter ever), I saw the glove...er...ripple and think I learned it was heavily influenced by input/output impedance.? I'd still like to find a way to measure the impedance of filters but haven't figured out how yet.
? ? In the meantime, I've learned? that I didn't gather enough information from those crystals (the holder capacitance, for a start), and I didn't put them in any sort of frequency order.? I have another set of crystals that I have properly measured and modeled in DISHAL.? DISHAL suggests the finished filter will have a 69Ω Z with a 2.5 KHz bandwidth.? We'll see.? (Is it correct to model this as an 8 crystal filter, even though the first and last are paralleled?? I hope so as that's what I'm doing... )
? ?I'm interested in how? you arrived at the 400Ω estimate - that's intriguing.? I'm also surprised that I keep hearing 2KΩ for crystal filters, yet DISHAL suggests low numbers.? Lots to learn.? ?Sleep first. ;)
? ? Best,
? ? ?Andy? (a maintainer's worst nightmare:? an operator with tools)
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On Tue, Dec 19, 2017 at 08:49 pm, John Backo wrote:
That's nice, Andy. But look at what happens to your noise floor
in the third instance.
The first instance shows a peaks and lows over a 5+ dB range, perhaps a bit
too much for a good filter.
The second shows a good ripple and a pretty good noise floor. I probably would
go with that one. Note that the G3UUR 8-xtal filter has different characteristics than
those of a plain 4 or 5 xtal ladder filter. You probably should assume (from your
measurements) that the output impedance is about 500 ohms and design a transformer for
that 10:1 match. It's worth a try anyway. Remember that the impedance ratio is the square root of
the number of turns, so your turns ratio would be around SqRt(10): SqRt(1). Try it and see what happens.
john
AD5YE
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Re: #Ubitx RX only version for general coverage
#ubitx
Hi Cor,
I can confirm. Just use the building blocks needed to receive. I'am building the uBitx from scratch and have been playing around with the receiver quite some time before starting to build the TX blocks.
It's great to receive on 160m, a band I don't have a rig for.?
73, Alex
PA1FOX
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Re: Help! I think I may have just ruined my 9 year old's Chanukah
The Si5351A is on
the Raduino board itself. Under the LCD.? It's fairly tiny.
The LM386 is in fact
the audio amplifier. No harm to be done by carefully
resoldering those couple of pins, although this is a double
sided plated-through board and they are probably soldered
adequately on the under surface - but check that while you are
there.
Bill, VK7MX
toggle quoted message
Show quoted text
Looking at the schematics, that appears to be LM386 - low voltage
power amplifier. It also appears that the SIS chip is on the
raduino itself. So, I'll look there for it. Could this power
amplifier be causing this...or is it most likely the SIS chip?
|
Re: Help! I think I may have just ruined my 9 year old's Chanukah
Looking at the schematics, that appears to be LM386 - low voltage power amplifier. It also appears that the SIS chip is on the raduino itself. So, I'll look there for it. Could this power amplifier be causing this...or is it most likely the SIS chip?
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Re: Ordered the 10th, no tracking number yet
Got a tracking number Dec 12, package picked up at 17:17 in Hyderabad, went to Bangalore, Leipzig, Cincinnati and Los Angeles by 06:37, 15 Dec. Must have gone on vacation as it arrived in Honolulu at 06:08, Dec 19th. Out for delivery at 09:38 and received at 17:37. It took almost as long to go 13 miles as it took to go from India to Ohio. At least it's here and not crushed like my bitX40. Still need to do a parts inventory as the parts ziploc bag broke open but it has completed its journey almost around the world
On December 19, 2017, at 4:10 PM, wcoates@... wrote:
I also ordered on the 10th. No indication about shipping so far although an email was returned saying it would be sent in the "next couple of days."
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Re: Help! I think I may have just ruined my 9 year old's Chanukah
On Tue, Dec 19, 2017 at 09:13 pm, Gordon Gibby wrote:
?
But the whole point was to indicate while you searched the right frequency range when trying Farhan's sketch, you DIDNT check the right frequency when trying the special sketch I sent you, because it generates a fixed VFO signal at 4.925 MHz and that is where you would look for it.? ? (and it you FOUND it, the radio shouldbe locked onto receiving 7.075 MHz lower sideband.....if other sections of the radio worked.
Ok...I checked again. This time searching 4.925 as well as above and below it. I didn't find the signal in LSB mode. I looked for a 10 legged chip and didn't find one. I did, however, find an 8 legged one. You can give your opinion on it and I wish you would, but it looks to me like two legs may not be properly soldered since they look very different from the other legs. 
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Re: Help! I think I may have just ruined my 9 year old's Chanukah
Here is the relevant subroutine in the 7025 KHz sketch:
void setFrequency(unsigned long f) {
//? Want to tune to 7075 kHz
//? Intermediate frequency is 12 000 000?
//? Needed VFO freq is 12 000 000 -? 7075000 =? 4925000
f=4925000UL;
si5351bx_setfreq(2,f);
?
? updateDisplay();
}
?
so you can see how it forces the frequency to 4925000? Hertz
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?The reason 12.000 MHz is important is that this is the crystal filter frequency (roughly) --- so the purpose of the VFO is to create a frequency that when added (or, subtracted one way or the other) with the DESIRED input frequency, a frequency of 12.00000MHz
can be created, which will then be SELECTED by the action of the narrow crystal filter.
Then, this internmediate frequency signal is mixed with a BFO (beatfrquency oscillator) signal right near (but a tiny bit higher than) 12.0000 MHz and the result is audio from the LOWER sideband of the intermediate frequency (12 Mhz) signal.? ??
I think I got that right.? ? ?
But the whole point was to indicate while you searched the right frequency range when trying Farhan's sketch, you DIDNT check the right frequency when trying the special sketch I sent you, because it generates a fixed VFO signal at 4.925 MHz and that is
where you would look for it.? ? (and it you FOUND it, the radio shouldbe locked onto receiving 7.075 MHz lower sideband.....if other sections of the radio worked)
Cheers!!!!
Gordon
"It's a Yaesu FT-891. With the regular sketch, I looked for it from 4.8-5.5 mhz. With yours, I looked
for it about 200 below and 500 above 7.025 mhz
Isn't the Si5351 just a chip? Can't I just replace the chip?"
?1.? The sketch (I just sent it again to be safe) should force your Si5355 to product a
4.925 Mhz Signal.? ?So you would cozy the input coax center conductor ofyour radio up to the raduino output wiring and hunt around 4.925 MHz.? ? (When you add 4.925 + 7.075 MHz, you get 12.000 Mhz --- so that is the reason this VFO setting
shoulld tune the BITX receiver to 7.075 MHz---- but you will NOT hear any signal from the bitx at 7.075 Mhz.....
2.? Si5151:? I had to actually go hunt for it.? ?I think it is a tiny surface mount chip with 5 leads on each side, making a total of 10 leads, soldered in.? ??
Gordon
On Tue, Dec 19, 2017 at 08:38 pm, Gordon Gibby wrote:
?When you get the chance, can you give us more specifics on how you connected your communications receiver, how you hunted for the signal? On what frequencies?? ?
It's a Yaesu FT-891. With the regular sketch, I looked for it from 4.8-5.5 mhz. With yours, I looked for it about 200 below and 500 above 7.025 mhz
If it truly isn't there --- andyou CAN get the 25.0000 MHz signal (still, right?)? then it is possible some portion of the Si5351 isn't working properly.? ?I'm not an expert onthat system of phase locked loops etc.?
Isn't the Si5351 just a chip? Can't I just replace the chip?
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Re: Help! I think I may have just ruined my 9 year old's Chanukah
?The reason 12.000 MHz is important is that this is the crystal filter frequency (roughly) --- so the purpose of the VFO is to create a frequency that when added (or, subtracted one way or the other) with the DESIRED input frequency, a frequency of 12.00000MHz
can be created, which will then be SELECTED by the action of the narrow crystal filter.
Then, this internmediate frequency signal is mixed with a BFO (beatfrquency oscillator) signal right near (but a tiny bit higher than) 12.0000 MHz and the result is audio from the LOWER sideband of the intermediate frequency (12 Mhz) signal.? ??
I think I got that right.? ? ?
But the whole point was to indicate while you searched the right frequency range when trying Farhan's sketch, you DIDNT check the right frequency when trying the special sketch I sent you, because it generates a fixed VFO signal at 4.925 MHz and that is
where you would look for it.? ? (and it you FOUND it, the radio shouldbe locked onto receiving 7.075 MHz lower sideband.....if other sections of the radio worked)
Cheers!!!!
Gordon
toggle quoted message
Show quoted text
"It's a Yaesu FT-891. With the regular sketch, I looked for it from 4.8-5.5 mhz. With yours, I looked
for it about 200 below and 500 above 7.025 mhz
Isn't the Si5351 just a chip? Can't I just replace the chip?"
?1.? The sketch (I just sent it again to be safe) should force your Si5355 to product a
4.925 Mhz Signal.? ?So you would cozy the input coax center conductor ofyour radio up to the raduino output wiring and hunt around 4.925 MHz.? ? (When you add 4.925 + 7.075 MHz, you get 12.000 Mhz --- so that is the reason this VFO setting
shoulld tune the BITX receiver to 7.075 MHz---- but you will NOT hear any signal from the bitx at 7.075 Mhz.....
2.? Si5151:? I had to actually go hunt for it.? ?I think it is a tiny surface mount chip with 5 leads on each side, making a total of 10 leads, soldered in.? ??
Gordon
On Tue, Dec 19, 2017 at 08:38 pm, Gordon Gibby wrote:
?When you get the chance, can you give us more specifics on how you connected your communications receiver, how you hunted for the signal? On what frequencies?? ?
It's a Yaesu FT-891. With the regular sketch, I looked for it from 4.8-5.5 mhz. With yours, I looked for it about 200 below and 500 above 7.025 mhz
If it truly isn't there --- andyou CAN get the 25.0000 MHz signal (still, right?)? then it is possible some portion of the Si5351 isn't working properly.? ?I'm not an expert onthat system of phase locked loops etc.?
Isn't the Si5351 just a chip? Can't I just replace the chip?
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Re: Help! I think I may have just ruined my 9 year old's Chanukah
Here's the datasheet for the Si5351:? ???
Looks like indeed it comes in a 10-lead surface mount version.? ?
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Show quoted text
"It's a Yaesu FT-891. With the regular sketch, I looked for it from 4.8-5.5 mhz. With yours, I looked
for it about 200 below and 500 above 7.025 mhz
Isn't the Si5351 just a chip? Can't I just replace the chip?"
?1.? The sketch (I just sent it again to be safe) should force your Si5355 to product a
4.925 Mhz Signal.? ?So you would cozy the input coax center conductor ofyour radio up to the raduino output wiring and hunt around 4.925 MHz.? ? (When you add 4.925 + 7.075 MHz, you get 12.000 Mhz --- so that is the reason this VFO setting
shoulld tune the BITX receiver to 7.075 MHz---- but you will NOT hear any signal from the bitx at 7.075 Mhz.....
2.? Si5151:? I had to actually go hunt for it.? ?I think it is a tiny surface mount chip with 5 leads on each side, making a total of 10 leads, soldered in.? ??
Gordon
On Tue, Dec 19, 2017 at 08:38 pm, Gordon Gibby wrote:
?When you get the chance, can you give us more specifics on how you connected your communications receiver, how you hunted for the signal? On what frequencies?? ?
It's a Yaesu FT-891. With the regular sketch, I looked for it from 4.8-5.5 mhz. With yours, I looked for it about 200 below and 500 above 7.025 mhz
If it truly isn't there --- andyou CAN get the 25.0000 MHz signal (still, right?)? then it is possible some portion of the Si5351 isn't working properly.? ?I'm not an expert onthat system of phase locked loops etc.?
Isn't the Si5351 just a chip? Can't I just replace the chip?
|
Craig Thibodeaux
Raj vu2zap