Vox amplifier - low power input
I wish to use small amplifiers with low average power input, less than half a watt, the least as possible. These amplifiers have some RF detection circuitry that use diodes. If I add to them in parallel other diodes such the schottky, would I lower the admissible power input?
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Re: Radio Kit Guide Updated
Great list for all the pockets! And it shows that Amateur Radio is not just an affair of the Big Three.
Il 21/nov/2018 00:03, "Neil Goldstein" < neilgoldstein@...> ha scritto: Updated radiokitguide at?
This is a list I maintain of available radio kits on the Internet.
Feel free to suggest any that I missed.
--Neil W2NDG
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Re: Radio Kit Guide Updated
On Wed, Nov 21, 2018 at 10:03 AM, Neil Goldstein wrote:
Updated radiokitguide at?
This is a list I maintain of available radio kits on the Internet.
Feel free to suggest any that I missed.
--Neil W2NDG
?Great list. Some to consider Mchf by m0nka Eagle trx by sp3osj Hambuilder 73 Simon VK3ELH
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So, first impression, as I was intrigued with the whole gamut of comments on multiple message boards, both positive and negative.
1) it looks very well constructed and of good quality
2) the package it came in protected it well considering the distance it travelled.
3) the wealth of information available here and other places in astonishing, to say the least.
4) I'm really looking forward to getting into the nitty gritty, including learning more about Arduino programming.
5) I'm already considering buying another one, just for the hell of it. It's well worth the modest price.
As I get into the radio the next few weeks, I'll post more. In the meantime...I am going to have a ton of fun!
73
Mike KA9JBD
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The uBITx has been sold.? There were many responses to this topic
Thanks
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Re: Radio Kit Guide Updated
Lots of kits. I have a LPF board kit and the Desna transceiver kit. I got the LPF board for the ubitx.?
Mike AI4NS?
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Updated radiokitguide at?
This is a list I maintain of available radio kits on the Internet.
Feel free to suggest any that I missed.
--Neil W2NDG
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Re: The ubitx in the box it came in
There are several different versions depending on the display(s) you're using. Be sure you're trying to load the correct version.
If you're loading a .hex file, I believe you want the?UBITX_CEC_V1.100_16P.hex file.
I you're compiling & downloading from source code you need to be sure you have the correct display selected by editing the header file.
73...? ? Mark? ? ?AA7TA
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Re: Bluetooth CAT control??
Yes, but how do you but the Bluetooth module to sleep when the USB cable *is* connected? Perhaps you can power the BT module from 328 pin and dont set it high until it's done so in setup (). The pretty pins can source or sinc 100ma, if there BT module needs more, throw in a bs170 or 270. I've used a $5 module to talk to program the 328 in one of my drones ... It wasn't quite plug and play as I needed to issue "AT" commands, (remember the old Hayes modem days?)? to setup the module ever power up.
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The ubitx in the box it came in
Just picked up a completed ubitx v3 from friend who no longer wanted to fuss with it.? Am having difficulty installing the KD8CEC arduino program.? The rig comes with the original 2 line lcd.? I was able to upload Farhan's v4.3 firmware,? I have gone over the instructions for KD8CEC but when uploaded all I get is blank display. I'm sure I have missed something but not sure what.??? Thanks
John AC8JW
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Re: Ubitx in box it came in.
Remi,?
I'll try out the CEC firmware. It looks like it should work with the stock display, correct? I have not explored the alternate firmware, I've only seen it used with the larger touchscreen display.?
Thanks!?
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Re: Bluetooth CAT control??
By "current SERIAL output of the Arduino", I assume Mike means the D0,D1 pins for the ATMega328's UART pins.
D0 is a UART RX line into the ATMega328P, D1 is a UART RX line out of the ATMega328P, both at 5v CMOS logic levels.
On the Nano clones, the CH340 chip provides a USB-to-UART interface, it's tied to D0,D1 through 1k series resistors.
But if no USB cable to host computer is plugged in, the CH340 goes to sleep and we can drive D0,D1 from some
other UART host, such has that HC-06 Bluetooth thing, the processor won't even know it's not the CH340.
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On Tue, Nov 20, 2018 at 10:01 AM, Mike Yancey wrote:
Yes, the HC-06 lil' module, would be wired in where the current SERIAL output of the Arduino goes. (I've not yet done CAT, but I'm presuming this is your 'CAT' Serial).
You'll have to research the HC-06 module and arrange it's Baud rate?to be whatever the Arduino expects.
Then, the fun starts - you'd 'join' the Bluetooth module to your PC as a Serial device. Connect your CAT program to that Serial port... 'walla' (or properly: voil¨¤), there ya are.
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The version you load should end in ¡°P¡±
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On Nov 20, 2018, at 11:23 AM, john mathieson < john.ac8jw@...> wrote: Just picked up a completed ubitx v3 from friend who no longer wanted to fuss with it.? Am having difficulty installing the KD8CEC arduino program.? The rig comes with the original 2 line lcd.? I was able to upload Farhan's v4.3 firmware,? I have gone over the instructions for KD8CEC but when uploaded all I get is blank display. I'm sure I have missed something but not sure what.??? Thanks
John AC8JW
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Re: ocxo 27 MHz oscillator
Every time I run into resistors with ambiguous color codes I grab the DVM first thing to check them.
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On Nov 20, 2018, at 2:31 AM, David Wilcox via Groups.Io < Djwilcox01@...> wrote:
I second the motion. ?Measure twice, solder once! ?In a recent kit the orange and red bands on various resistors was so close that I could not tell the difference even with a very bright light (actually MANY bright CFL daylight lights at my work station). ?What tipped me off was that the number of resistors in the BOM didn¡¯t match up so I started measuring everything. ?
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Re: Ubitx working, audible tone over signals on RX
Remi,?
I'll try out the CEC firmware. It looks like it should work with the stock display, correct? I have not explored the alternate firmware, I've only seen it used with the larger touchscreen display.?
Thanks!?
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Thanks Evan and Thanks to Remi.? your info got it working.? The original software I downloaded had nextion selected? so commented that out and uncommented the original lcd.? Works nice.? Now on to the I2C mods.?? Thanks again
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Re: spur & harmonics fix, v2
the 47 ohms resistors provide a resistive source impedance of appoximately 50 ohms. the emitter follower biased at 7 ma has an Re of 26/7 ~3 ohms. this 3 ohms and 47 os together provide a driving impedance of 50 ohms. - f
What is the purpose of the 47ohm resistors like R27 at the output of each rx and tx amplifiers? Are they really needed?
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Re: Bluetooth CAT control??
Yes, the HC-06 lil' module, would be wired in where the current SERIAL output of the Arduino goes. (I've not yet done CAT, but I'm presuming this is your 'CAT' Serial).
You'll have to research the HC-06 module and arrange it's Baud rate?to be whatever the Arduino expects.
Then, the fun starts - you'd 'join' the Bluetooth module to your PC as a Serial device. Connect your CAT program to that Serial port... 'walla' (or properly: voil¨¤), there ya are.
Mike Yancey, KM5Z
Dallas, Texas
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Neil Goldstein
N2LO
