Re: ND6T AGC and Click kit wiring notes
Nevermind, I found the spreadsheet..
THANKS!
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Re: ND6T AGC and Click kit wiring notes
Hi Kees,
Just wondering if you can confirm my DX order for AGC 2 boards is ok?
73 NIck VK4PLN
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Re: Capacitance meter for the Nano
Also take a look at Kees' AQRP VIA near the bottom of?
You can sweep those coils and caps from 4 khz to 440 mhz, see where they start
looking like caps and coils. respectively.?
Plot smith charts.?
Show the response of a crystal filter.
Great for analyzing antennas.
Can be used as a two port Vector Network Analyzer.
Portable and self contained,
Cheap.
Jerry
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On Tue, Jun 19, 2018 at 04:24 pm, <jk.futter@...> wrote:
For those interested Silicon chip magazine from Australia is running this project this month
.
It would be all that is needed in the ham shack for LC measurements
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Re: Capacitance meter for the Nano
For those interested Silicon chip magazine from Australia is running this project this month
.
It would be all that is needed in the ham shack for LC measurements
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Re: Capacitance meter for the Nano
Yup, an error in the comments.
I've done worse.
INPUT_STRAY_CAP was M0TWM's original name for that variable.
Probably should have left "STRAY" in there somewhere.
Can wait for v01.
Thanks for the correction!
And looks like you have it calibrated.
Jerry
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On Tue, Jun 19, 2018 at 04:14 pm, Doug W wrote:
Unless I have misunderstood your comments I may have found an error.? In the top comments you state to calibrate adjust INPUT_STRAY_CAP.? I couldn't find that in the sketch but it appears changing IN_CAP_TO_GND achieves the desired results.
--
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Re: Capacitance meter for the Nano
Thanks for writing this.? It is just the sort of project that is helping me learn how these things work.? Not long ago I bought an Uno to play with and learn how these new fangled things work so I happened to have it sitting in front of me and your sketch looked interesting.  Unless I have misunderstood your comments I may have found an error.? In the top comments you state to calibrate adjust INPUT_STRAY_CAP.? I couldn't find that in the sketch but it appears changing IN_CAP_TO_GND achieves the desired results. --
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I received a Bitx40 kit for my birthday but it came with no instructions. Is there any place to get the color schematic that is supposed to come with it?
Thanks,
Chris Evans
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Re: I'm really stuck! No Xmit Pwr.
#ubitx
Chip?
Do you have, or can you construct a simple diode RF detector to use with your DC voltmeter?
This could be useful for tracing RF through the transmit section.
There are many variations on this design.?
Arv
_._
On Tue, Jun 19, 2018 at 3:25 PM Latham, Chip < clatham@...> wrote: Arv, I have an RF Levels (RMS) Showing DC levels through the RF Section with all the Values, Problem is all the values I measure are almost spot on.
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Re: I'm really stuck! No Xmit Pwr.
#ubitx
If you are using the supplied BNC connector, test to make sure you are getting good contact between the center pin of the connector and the coax.? A few people had issues with that. Just a suggestion.
Marco - KG5PRT?
On Tue, Jun 19, 2018, 4:30 PM w7hd.rh < w7hd.rh@...> wrote:
Has all that for you already.
On 06/19/2018 02:11 PM, Arv Evans
wrote:
Chip
Maybe
someone could mark up the uBITX schematic to show signal path
for transmit and for receive.?
Some
sort of transparent color overlay might work well for those
who are struggling with the technology.
This
and a block diagram for receive path and a separate block
diagram of the transmit path might be
useful.
Anybody...?
Arv
--
Ron W7HD - NAQCC#7587 OMISS#9898 KX3#6966 LinuxUser#415320
Editor OVARC newsletter
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Re: KD8CEC - Nextion Display - IAN questions
OK.? so I'm sure I'm sounding really impatient here but,? well...? I'm really excited about getting the Nextion display going on my ubitx. ?
Ian, I was wondering if you have an idea of when the test will be finished and we can download 1.09?? I'm getting tired of refreshing my screen on your website every 30 seconds..? ;-)
73-Gary
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Capacitance meter for the Nano
I've been talking about this code for a simple but accurate capacitance meter for a year and a half now, figured it was time to nudge this forward a bit. ? ?? ? ?? /g/BITX20/message/19453The attached zip file has Arduino source code for any spare Nano you happen to have sitting around. Load the code into the Nano, put a cap across Nano pins A0 and A1, and it will display the capacitance out to the Arduino IDE's serial monitor at 115200 baud. If you load the code into a Raduino, the capacitance will display in the 16x2 parallel LCD. (A bit dangerous, a charged cap could take out the A0 and A1 IO cells.) The code also supports a 16x2 LCD with backpack such as this one: ? ?? So can build a stand-alone capacitance meter consisting of a Nano, the i2c display, and a battery. Or a standalone meter consisting of a Nano and the slightly cheaper (but more wires) parallel display wired up as it is on the Raduino. In addition to showing capacitance from 1pf to 1000uF, it also shows the voltage presented to A6 and A7 If anyone can reach Jonathan Nethercott, M0TWM, you might inform him of this botch of his code. I can't get through the Captcha on his webpage. Jerry, KE7ER?
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Re: LED bargraph mWattmeter ......Very useful for a uBITX or BITX40.
Kees
For a wide power range watt-meter it may be necessary to use a digital readout simply due to
more watts being covered.? Digital readout provides finer resolution as long as the measuring
circuit is as accurate as the readout resolution.
For a QRP watt-meter it seems that less readout resolution can be tolerated if we are only
wanting to see if the rig is putting out 0 to 5 watts.? The AD8307 would convert analog input to
log-scale (decibels) and a bar-graph would show rather gross changes in power level.? Also
could have range switching with the bargraph display to cover multiple ranges or multiple
resolutions.
I agree totally that using a real bridge (Stockton, Bourne, or similar) is necessary if we are to
know how much power is going out versus how much is being reflected.? Given the sensitivity
of IRF-510 devices to impedance mismatch, this may be of prime importance.?
From that, there seems to be two directions of discussion, (1) a dummy load and attached
watt-meter, and (2) an in-line bridge and adequate readout for protecting the RF PA from
mismatch.
There is also the issue of most BITX designs not having a low power output mode that can be
used for tune-up purposes. Not sure yet what to do about that situation.
Arv
_._
Arv,
You are right on.
Local AQRP position:
I think the benchmark for what is useful?and sells as a kit ought to be the mWattmeter III which is based on our earlier mWattmeter II (88 sold) ......it has a Stockton Bridge, uses a (painstakingly prepared) lookup table......which Ben and I don't want to do again, minimal microcontroller, and 16x2 backlit display. It sells for $41.95?without a case.
The way I see it; you either come up with like function/capability (Nano microcontroller, 16x2 backlit LCD, etc) at 2/3 of that price (~$30) or you come in with less function/capability (LED bargraph, LM3914(s), no microcontroller) at a much lower price (<~$15). Both including an enclosure.
73 Kees K5BCQ
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Bill Watkins wrote:
>I¡¯ve had an idea for a ¡°tablet-like¡± rig using the Nextion display to make this suitcase friendly.?
>
>Anyone have any ideas about enclosure size, shape, manufacturer?
A flush-fitting display would be tough to home-engineer.? A display that folded down against the top of a case would be much simpler, especially if it folded forward to protect the LCD display.
As it happens, I have an old surplus external hard disk drive case from the Mac Plus era that would easily hold a BITX of any flavor as well as its power supply ... and maybe even support another stage of PA amplification, too.
I don't see these as often as I used to, but they frequently surface at the radio flea market.? And at computer flea markets as well, sometimes for free.
Back in those bad old days, you could usually buy a new enclosure for about $30 or $40.?
HTH 73 Jim N6OTQ
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Re: I'm really stuck! No Xmit Pwr.
#ubitx
Has all that for you already.
On 06/19/2018 02:11 PM, Arv Evans
wrote:
Chip
Maybe
someone could mark up the uBITX schematic to show signal path
for transmit and for receive.?
Some
sort of transparent color overlay might work well for those
who are struggling with the technology.
This
and a block diagram for receive path and a separate block
diagram of the transmit path might be
useful.
Anybody...?
Arv
--
Ron W7HD - NAQCC#7587 OMISS#9898 KX3#6966 LinuxUser#415320
Editor OVARC newsletter
|
I received a Bitx40 kit for my birthday but it came with no instructions. Is there any place to get the color schematic that is supposed to come with it?
Thanks,
Chris Evans
|
Re: I'm really stuck! No Xmit Pwr.
#ubitx
Arv, I have an RF Levels (RMS) Showing DC levels through the RF Section with all the Values, Problem is all the values I measure are almost spot on.
|
Re: LED bargraph mWattmeter ......Very useful for a uBITX or BITX40.
Arv,
You are right on.
Local AQRP position:
I think the benchmark for what is useful?and sells as a kit ought to be the mWattmeter III which is based on our earlier mWattmeter II (88 sold) ......it has a Stockton Bridge, uses a (painstakingly prepared) lookup table......which Ben and I don't want to do again, minimal microcontroller, and 16x2 backlit display. It sells for $41.95?without a case.
The way I see it; you either come up with like function/capability (Nano microcontroller, 16x2 backlit LCD, etc) at 2/3 of that price (~$30) or you come in with less function/capability (LED bargraph, LM3914(s), no microcontroller) at a much lower price (<~$15). Both including an enclosure.
73 Kees K5BCQ
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Re: I'm really stuck! No Xmit Pwr.
#ubitx
Chip
Maybe someone could mark up the uBITX schematic to show signal path for transmit and for receive.?
Some sort of transparent color overlay might work well for those who are struggling with the technology.
This and a block diagram for receive path and a separate block diagram of the transmit path might be
useful.
Anybody...?
Arv
_._
On Tue, Jun 19, 2018 at 2:44 PM Latham, Chip < clatham@...> wrote: Tnx,
Arv your right. No longer have the knowledge handy to draw upon. But thanks for the great advice. I will guess my way along.
Just thought someone could hold my hand a little.
Chip
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Re: ND6T AGC and Click kit wiring notes
Thank you Kees!
73,Bill NZ0T
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Nick VK4PP
Latham, Chip