which circuit are you looking at?
- f
On Wed, Oct 4, 2017 at 9:25 PM, Jerry Gaffke via Groups.Io <jgaffke@...> wrote: Those output low-pass transmit filters are 50 ohms and symetrical.
You could just borrow a filter design from some other rig that's suitable for 50 Watts of power.
Should be one filter per ham band as is typical. (You can cheat on 60m, 30m, 17m, 12m)
There may be other issues with uBitx documentation.
For example, perhaps some of those resistors in the PA need to be moderately beefy.
You will need tools to sweep that crystal filter and adjust impedances and cap values to suit
your carefully matched crystals.? The bandpass filter at L1,2,3,4 will also need to be carefully tuned.
There is no software yet available for a Raduino to drive it.
But if none of that sounds daunting, go for it.
Jerry, KE7ER
?
On Wed, Oct 4, 2017 at 08:07 am, Jerry Gaffke wrote:
You don't want to just copy that uBitx schematic and expect it to work properly.
Still under development.
|
Re: A bit OT, blame it on W8TEE
Jack,
well poop, that'd didn't compile.
Scary thing is I think i understand what you did!
I put the #define statements up with the rest of them.
tried the code in setup, then in the loop
I get this error
'spaces' was not declared in this scope
No white smoke... And that's a good thing
Mike, wb8vge
|
Re: Multiband bitX40 questions
Greg, The one in the QEX article is obsolete. I have found, and bought, a number of modules on Ebay. Most recently I picked up 3 equipment pulls from the same guy for $6.00 apiece. Any module the puts out the 1 PPS signal is what you want. ? v/r Fred W4JLE ?
toggle quoted message
Show quoted text
From: [email protected] [mailto:[email protected]] On Behalf Of greggaston@...
Sent: Wednesday, October 4, 2017 10:41
To: [email protected]
Subject: Re: [BITX20] Multiband bitX40 questions ? What GPS engine did you use?? Where can I get one for $6.95?? ?The GPS device listed in the QEX article costs a lot more.? Definitely interested in duplicating this.??
Thanks
Greg
KD4VV
|
Those output low-pass transmit filters are 50 ohms and symetrical.
You could just borrow a filter design from some other rig that's suitable for 50 Watts of power.
Should be one filter per ham band as is typical. (You can cheat on 60m, 30m, 17m, 12m)
There may be other issues with uBitx documentation.
For example, perhaps some of those resistors in the PA need to be moderately beefy.
You will need tools to sweep that crystal filter and adjust impedances and cap values to suit
your carefully matched crystals. ?The bandpass filter at L1,2,3,4 will also need to be carefully tuned.
There is no software yet available for a Raduino to drive it.
But if none of that sounds daunting, go for it.
Jerry, KE7ER
?
toggle quoted message
Show quoted text
On Wed, Oct 4, 2017 at 08:07 am, Jerry Gaffke wrote:
You don't want to just copy that uBitx schematic and expect it to work properly.
Still under development.
|
Re: A bit OT, blame it on W8TEE
Source code (complete project) for the sample code I posted yesterday
may be found here:
It is functional and works (I have already built two controllers), but
is very much a work in progress.
It is not BITx related, but may provide useful examples of how various
bits of logic may be implemented.
If you have any questions, I'll be happy to answer them.
73
- Mark B1VQW
|
Also, adding the Spot/Fine Tune button lets you tune in 1 Hz steps. Even when covering a 300 KHz span, the Fine Tune button makes it easy to tune the BITX.
|
Zero is probably a good value for now: ? ?? /g/BITX20/message/24738You don't want to just copy that uBitx schematic and expect it to work properly. Still under development. Jerry
On Wed, Oct 4, 2017 at 07:46 am, tArthur Bryant wrote:
I am planning on building a uBITX and as I was going through the schematic I noticed that C241 & C245 are labeled 0. is there a proper value for them?
|
Great! By how much did you have to reduce the value? Was 9999 ok, or did
you need to go lower?
73 Allard PE1NWL
toggle quoted message
Show quoted text
On Wed, October 4, 2017 15:25, Brent Seres wrote: It works! Thanks. Now I just have to determine the optimum value. I guess
that is what I get for getting a good deal on ebay. I'm gradually learning
how the code works.
73
Brent
|
I am planning on building a uBITX and as I was going through the schematic I noticed that C241 & C245 are labeled 0. is there a proper value for them?
Art
KB8HGW
|
Re: Multiband bitX40 questions
What GPS engine did you use?? Where can I get one for $6.95?? ?The GPS device listed in the QEX article costs a lot more.? Definitely interested in duplicating this.??
Thanks
Greg
KD4VV
|
It works! Thanks. Now I just have to determine the optimum value. I guess that is what I get for getting a good deal on ebay. I'm gradually learning how the code works.
73
Brent
|
Hi Brent,
an alternative way to fix your problem is perhaps the following change.
Normally, when the pot is at its upper limit, the 'knob' value should read
10000. Fast tuning will normally start when the knob value equals 10000:
at line 1943:
else if (knob == 10000) {
However in your case, perhaps due to poor pot quality, it seems that the
knob value cannot reach 10000, the maximum value it can reach may be just
9999.
You could try to change line 1943 to:
else if (knob > 9998) {
if that still doesn't work, try lower values (9998, 9997, etc. until it
works).
73 Allard PE1NWL
toggle quoted message
Show quoted text
On Wed, October 4, 2017 05:25, Brent Seres wrote: Hi again Allard
I tried making those changes, no luck. Changing the values does extend the
tuning range, depending on what value I put in (eg?? I can get the radio
to tune to 7105 instead of 7100), but it never kicks in to the 10th steps
on the top end. Things work fine at the bottom. Using my dvm, I have
verified that at the bottom end of the pot, the pot wiper voltage goes
right to zero. At the top end, there is about a 20mv difference between
the 5v pot terminal and the wiper.
I'm brand new to arduino code, so I'm trying to learn, so please forgive
my questions.
Thanks??
Brent
|
Re: Multiband bitX40 questions
Thanks a lot!
Looks really interesting.
|
Re: BITx40 Block Diagram ?
Hi I think you made a mistake in labeling the filter at the input of the receiver section. It is a BPF not an LPF Regards Lawrernce
On Wed, Oct 4, 2017 at 1:45 AM, Goran VE6GPO <goran.poprzen@...> wrote: Last spring I did the same for the DX section of VE6AO. Created a block diagram in Visio. Here's the picture:
Hope this helps.
73,
Goran VE6GPO
|
Would changing the value in line 1943 to something less than 10000 help?
|
Hi again Allard
I tried making those changes, no luck. Changing the values does extend the tuning range, depending on what value I put in (eg? I can get the radio to tune to 7105 instead of 7100), but it never kicks in to the 10th steps on the top end. Things work fine at the bottom. Using my dvm, I have verified that at the bottom end of the pot, the pot wiper voltage goes right to zero. At the top end, there is about a 20mv difference between the 5v pot terminal and the wiper.
I'm brand new to arduino code, so I'm trying to learn, so please forgive my questions.
Thanks?
Brent
|
Re: BITx40 Block Diagram ?
Goran VE6GPO wrote... Last spring I did the same for the DX section
of VE6AO. Created a block diagram in Visio. Looks great, but nitpicking a bit, isn't the filter over on the left actually a bandpass filter and not a low pass filter? -- 73 Keith VE7GDH
|
Thanks
I'll let you know how I make out
73
Brent
|
Re: preview: Raduino v1.25 with capacitive touch CW keyer
Another idea, which you may have already implemented:
Different builders will have different size and placement of the two touch pads,
and thus different capacitance when not being used.
Also, some may be trying insulating tape over the sensors and such.
I'd consider adding a caibration step.
Measure the transition time for each paddle when user is sitting on his hands.
Measure again when fingers are resting naturally on the pads.
Report an error if the difference is too small to give reliable results.
Calculate an optimal time in between the inactive and active transition times,
store that to eeprom.
I'm sure some capacitive sensors out there are continuously auto-calibrating,?
The trackpad on this chromebook certainly does, and I find it infuriating.?
toggle quoted message
Show quoted text
On Tue, Oct 3, 2017 at 05:15 pm, Allard PE1NWL wrote:
Thanks for this idea. I haven't considered that option.
When I have some time I'll try it out to see if it would work. If so it
could save us one I/O pin!
|
Re: preview: Raduino v1.25 with capacitive touch CW keyer
Hi Jerry,
Thanks for this idea. I haven't considered that option.
When I have some time I'll try it out to see if it would work. If so it
could save us one I/O pin!
73 Allard PE1NWL
toggle quoted message
Show quoted text
On Tue, October 3, 2017 22:51, Jerry Gaffke via Groups.Io wrote: One slight not-so-obvious advantage of this scheme: ??
?? Shorting that keyer paddle to case ground with your body would count as
key-down.
Could well be not-so-obvious advantages to using Allard's third pin scheme
that I am not seeing just yet.
Jerry
On Tue, Oct 3, 2017 at 12:40 pm, Jerry Gaffke wrote:
Not obvious the third pin is required for the capacitive touch keyer.
The dit and dah Nano input pins could also have open-drain outputs,
so drive the pin low and then release it to slowly float back up.
Read from the pin after it is released to see how long it takes
the pullup resistor to get the pin high again.
There should be plenty of web hits on how to do a bidirectional
open-drain
pin under Arduino.
Likely implemented as a tristate output, the output is enabled when
actively driving the pin low.
|
Allard PE1NWL
Arthur Bryant
Brent Seres/ VE3CUS