Re: Diy oscilloscope
#parts
Jerry Gaffke
That could work fine as a high impedance probe for use with an oscilloscope or spectrum analyzer.
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To use it with a DVM you will need to add a diode RF probe or similar at the output, as what it sends out is an RF signal with the voltage 10x what it sees at the input (20dB). The AD8307 based probes can be used directly for sniffing out low level RF if all you have is a DVM. I haven't used any of those ebay probes, have no idea how well they work.
On Mon, Feb 5, 2018 at 09:51 pm, Joe Puma wrote: I purchased this one. My radio tech manual shows test points up to 8v so I think this probe should cover it. The other one said 3v input max.
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Re: ubitx AGC?
On Mon, Dec 11, 2017 at 03:48 am, Weddig, Henning-Christof wrote:
use an opamp with a gain of 10 (20 dB) and an audio AGC system using a SSM2166.I am working on something similar for the microphone side with a SSM2167, and am doing a lot of thinking about how to do that on the RX side. Someone recently used a programmable TI audio amp chip for compression and limiting. I was thinking of using the SSM2167 in a similar way, and leaving the stock µB audio amp in place.
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Re: bitx 40 cat and digital modes
R. Kuehn
Thanks for the reply Joe.
What version of the firmware you are using with CAT support, or is it your own? I see there is a github repository that uses a modified version of Allard's 1.24 firmware: https://github.com/ggibby1/BitX40-1.24-FT857d, that claims to have added support, but I haven't given it a try yet. Ralph N9WTX
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Re: uBITX rotary enconder
Jose,
I have one of those and it outputs 400 pulses/revolution. This may present problems for the software to read properly as the standard uBITX encoder puts out about 24 pulses/revolution. The software to read the encoder would have to be changed to make that optical one work right. Jim - W0EB
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Re: uBITX Firmware (CEC) 0.30 released (Test version).
#ubitx
Je
A link from where to download version 0.35, please! I found only 0.33! Regards, Emil
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W0EB/W2CTX Latest uBITX software release
#ubitx
This software is for the original uBITX Raduino with a standard (NOT the I2C) display.
The zip file contains a complete, illustrated manual in PDF format that contains detailed instructions on implementing this version of the software. We have totally restructured the menu to make it much easier to use. The Nano's CPU cycle usage has been optimized for vastly better CW (a minor front panel wiring change is necessary to use this software). Split is working (you do NOT have to be in transmit to change the transmitter's frequency) and though not available yet CAT is being worked on. Not promising CAT anytime soon but we're trying to implement it and keep CW working right. (Not an easy task with a Nano but we want to keep from having to change out the Nano for some bigger card). Due to an easy programming trick, the keyer's dash paddle AND the Hand Key/external keyer connection has been moved to the same wire as the SSB PTT on the Raduino's digital connector (the orange wire). This is possible since we don't normally use the CW key or paddles when in SSB mode and we don't use PTT when in CW mode. The menu item CW:Key or CW:Pdl selects whether or not the line is used for the hand key or dash paddle. This requires a minor wiring change and either a short adapter cable to be built for the hand key/external keyer or a separate hand key jack be added. Either way it's an easy mod. This change gives the analog A7 input back to the guys wanting it for an "S" meter or power/swr metering. The blue wire (A6) remains as the dot input. Since we don't have to select a specific threshold voltage on A6 for dot/dash/hand key and just determine key up or key down, the 2.2K and 10K resistors are no longer needed and the CW paddles work MUCH better. I posted the ubitx_V2_00R.zip file in the files section yesterday but there is so much stuff there that I'm posting the software again here to make it easier to locate for those who wish to use it. Feedback is always appreciated and we hope you find the program useful. Jim Sheldon - W0EB and Ron Pfeiffer - W2CTX
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uBITX rotary enconder
Jose Matos
Hi DR fellows
Just asking if anyone is thinking to change the rotary encoder of the uBITX to an optical encoder due the not good quality of the uBITX encoder. can it is possible? I found this on ebay: https://www.ebay.es/itm/Rotary-Encoder-400P-R-6mm-Incremental-Optical-Shaft-Working-Measurement-5-24V-SH/252550089532?hash=item3acd288b3c:g:uVsAAOSwmLlX4i36 best 73s José CT1FKN
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Re: UBITX - COLOUR TFT - ATMEGA - CONFIGURATION / CONNECTIVITY DIAGRAM
#ubitx
Joe
Good morning, Bert The project does not require a shield. Files info located at Joe
On Tue, Feb 6, 2018, 2:13 AM Bert N8NN <bertgarcia73@...> wrote: Can you point me to the software to download into the ATMega board? Thanks!
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Re: uBitx final amp Class AB?
K9HZ <bill@...>
The characteristic curves for different operating voltages are right in the spec sheets for them. Its a simple matter to pick the proper curve Vds curve and adjust the bias to the correct operating point given the class of operation.
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Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ
Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois
Owner – Operator Villa Grand Piton - J68HZ Soufriere, St. Lucia W.I. Rent it: www.VillaGrandPiton.com email: bill@...
On Feb 5, 2018, at 7:45 PM, Dexter N Muir <dexy@...> wrote:
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Re: ubitx AGC?
Konstantinos Konstas
Hi there Alex.
Thanks for the info. I am thinking of doing the same as AGC is needed with some QRO signals in the bands. Based on the attached schematic that I use for reference I have a couple of questions. C78 on the top schematic needs to be removed or not? R253 needs to be changed from 10K to 1K as in the bottom schematic or not? Of course C78 has to be removed and R70 replaced with a 2K2 one. This is obvious. Thanking you in advance, 73 de Konstantinos, SV1ONW
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Re: Diy oscilloscope
#parts
Lawrence Galea
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On Mon, Feb 5, 2018 at 9:23 PM, Joe Puma <kd2nfc@...> wrote:
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Re: UBITX - COLOUR TFT - ATMEGA - CONFIGURATION / CONNECTIVITY DIAGRAM
#ubitx
Bert N8NN
Can you point me to the software to download into the ATMega board? Thanks!
Is the 3.2" TFT display with an expansion board shield mounted to the Mega? Bert
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Re: Diy oscilloscope
#parts
Joe Puma
I purchased this one. My radio tech manual shows test points up to 8v so I think this probe should cover it. The other one said 3v input max.
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On Feb 5, 2018, at 3:23 PM, Joe Puma <kd2nfc@...> wrote:
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Re: Case
Konstantinos Konstas
Congrats on making this nice case Sajeesh. Very nice job.
On 6 February 2018 at 07:20, AA7GW <garywixom@q.com> wrote:
--
73 de SV1ONW
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Re: uBITX Firmware (CEC) 0.30 released (Test version).
#ubitx
Konstantinos Konstas
Thanks a lot once more Ian for your very prompt response and guidance on split function.
On 6 February 2018 at 02:01, Ian Lee <kd8cec@...> wrote:
--
73 de SV1ONW
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Re: Case
Very nice
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AA7GW
On Feb 5, 2018, at 1:06 AM, Sajeesh Pilakkat via Groups.Io <sajeeshpilakkat@...> wrote:
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Re: uBITX Firmware (CEC) 0.30 released (Test version).
#ubitx
Hi Ian: No pressure from me, as it's your software. However, I think type checking is a real useful tool, especially when debugging code. I think everyone will appreciate it. Jack, W8TEE
From: Ian Lee <kd8cec@...> To: BITX20@groups.io Sent: Monday, February 5, 2018 11:11 PM Subject: Re: [BITX20] uBITX Firmware (CEC) 0.30 released (Test version). #ubitx Jack. I am always thanks for your advice. I decided to follow your advice and work for about an hour and change everything to cpp. For the time being, i will keep the existing .ino (for forked other source) and provide the converted source to .cpp when version release. Ian KD8CEC 2018-02-06 9:28 GMT+09:00 Jack Purdum via Groups.Io <jjpurdum@...>:
-- Best 73 KD8CEC / Ph.D ian lee kd8cec@... www.hamskey.com (my blog)
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Re: uBITX Firmware (CEC) 0.30 released (Test version).
#ubitx
Ian Lee
Jack. I am always thanks for your advice. I decided to follow your advice and work for about an hour and change everything to cpp. For the time being, i will keep the existing .ino (for forked other source) and provide the converted source to .cpp when version release. Ian KD8CEC 2018-02-06 9:28 GMT+09:00 Jack Purdum via Groups.Io <jjpurdum@...>:
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Re: bitx 40 cat and digital modes
Joe Puma
I successfully used FT8 modes and jt9/65 before that. I used a raspberry pi with a usb audio and connected mic and speaker to that. For PTT I used a gpio pin on the rpi and made a ground ptt circuit. Wsjtx did the rest.
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There is CAT control for the bitx40 and wsjtx has good CAT control support. Joe KD2NFC
On Feb 5, 2018, at 10:29 PM, rekuehn@... wrote:
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Re: Anyone (US Only for now) need a uBITX Raduino repaired?
#ubitx
OOPS, Regarding Clock 2, it will show the display frequency only in CW mode and only with the key down.
Jim - W0EB
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