Keyboard Shortcuts
Likes
- BITX20
- Messages
Search
|
Re: The Users User Manual
开云体育The appointments come through the state director and the test and final appointment through the ARRL. ? v/r Fred W4JLE ? ? From: [email protected] [mailto:[email protected]] On Behalf Of William R Maxwell
Sent: Tuesday, April 11, 2017 5:06 AM To: [email protected] Subject: Re: [BITX20] The Users User Manual ? ah, but who appoints them, Fred? ? On 11/04/2017 11:33 AM, Dr Fred Hambrecht wrote:
? |
|
Re: pcb
William Kimber
开云体育QRP-Labs has a Si5351 version that fits the same foot print as Ebay AD9850/1 but has all three outputs available. Cheap too. Si5351 is pre soldered.
Just received a couple of kits but not yet had time to assemble.
Cheers, Will On 04/11/2017 09:10 PM, Lawrence Galea
wrote:
|
|
Re: pcb
Hi Jack There ere even cheaper one using the AD9951 and also various models Just put AD9851 in the ebay search window Regards Lawrence On Tue, Apr 11, 2017 at 9:48 AM, Mvs Sarma <mvssarma@...> wrote:
|
|
Re: The Users User Manual
toggle quoted message
Show quoted text
|
|
Re: pcb
Hi, ?You might try to incorporate the ALC facility that helps? VFO level constant over the entire range of the AD9850 frequencies. Otherwise the carrier level drops badly as we reach higher frequencies.It is possible with the 3 row pins PCB.you mentioned. ebay - item # 331887478013 All the best sarma vu3zmv |
|
Re: pcb
Hi Jack Wouldn't this be a better choice? Regards Lawrence
1PCS DDS Signal Generator Module 0-70MHz AD9851 2 Sine Wave and 2 Square Wave US $12.30 On Tue, Apr 11, 2017 at 5:05 AM, Jack Purdum via Groups.Io <econjack@...> wrote:
|
|
Re: Birdie at 7199 - a surprising observation!
开云体育No, you were quite correct.? When two parts of a circuit already
share a common ground (e.g. Raduino and BITX40), only ONE END of
the coax shield should be connected.? Otherwise, you are providing
multiple return paths for both DC and RF current, leading to
unpredictable and unexplainable behavior.? If the circuits at each
end do NOT share a common ground (e.g. transmitter and antenna,
scope and circuit under test, transmitter and amplifier, etc.),
then BOTH ends of the shield need to be connected in order to
provide a common return path. -Jim W7JLL (just reading the mail while waiting for my BITX40) On 04/10/2017 03:13 PM, Steve Greer
wrote:
|
|
Re: The Users User Manual
Doubling to 24v. I really have to start proofreading these things before sending them off. On Mon, Apr 10, 2017 at 08:28 pm, Jerry Gaffke wrote:
Doubling the voltage to 12v ? |
|
Re: The Users User Manual
10W from 12v on 40m, about right for two IRF510's in push-pull. Doubling the voltage to 12v gives roughly 4x the power, so figure something like 40W. Yes, it may fall off some when you push towards 30mhz. On Mon, Apr 10, 2017 at 07:52 pm, John Smith wrote:
? |
|
Re: Bitx-40 S meter
Thank You Andrew for your sketch. ?It works great. ?A couple additions that I would like to see and maybe you can help me out with it. ?I would like to see an additional decimal to separate the khz from the hz. ?Also, maybe add numbers to the S-meter also. ?I am going to work on these a little bit and see what I can come up with too. ? Thanks again for your work already. |
|
Re: pcb
Jack Purdum
The board's not ready for prime time yet. We still have a lot of testing to do. I will post here, probably mid-May, about the availability of the PCB.? If you want to get a head start on parts, we know you'll need an AD9850 board (See eBay?331887478013. Note the double row of pins. The other board type won't work.), an mcufriend TFT display (112239992127 is the 2.4" shown in the previous post's picture), the Mega 2560 Pro Mini (161757319864), and a buck converter (272604581988). I buy multiples of the buck converter because I've been known to torque the adjusting screw right off the board. Tayda Electric has the caps, resistors, and the inductors (100uH) at very reasonable prices. Also, while out of Asia, they have a distribution warehouse in CO so orders are pretty quick. As for the display, we opted for the smallest one because of the case size we plan on using. Jack, W8TEE From: "bellrossjr@..." <bellrossjr@...> To: [email protected] Sent: Monday, April 10, 2017 10:47 PM Subject: [BITX20] pcb Hi Jack: I want purchase a TFT VFO Hi Jack: What is the availibilty of the tft lcd vfo board? I would like to? purchase one ?if possible. Thanks Ross K7RSh |
|
Re: The Users User Manual
The program has good intentions in contacting you by mail with important information about your signal or usage issues, assuming you care about that. And I do, and appreciate the heads up. But an overzealous rookie do gooder can cause you serious problems. And as a new operator it scared the crap out of me, and I bought a MFJ-9240 CW Transceiver to avoid another notice about signal quality. But I couldn't stay away from the kit, eventually discovering it was the D882 final. Replacing that, I then had a normal, clean, strong, sounding signal. And had two more contacts with it. Don't tell Jack I said this, but I took a shortcut with learning the code. And Made a PS/2 CW keyboard keyer from his book and added a relay module after the opto-isolator chip for solid normal sounding keying. Just the chip alone produced a weaker sounding transmitted signal with my rig. Probably switching too fast. I loved it until I switched to using Fldigi, and a keying circuit for that which also got a relay module added. Having two keyboards in front of me got confusing. I took another look at the uBitx write up and he says it's 10 and 5 watts.- http://www.phonestack.com/farhan/ubitx/ubitx.html |
|
Re: Tuning with Si5351 and Rotary encoders
Jack Purdum
Strange. I'll take another look, but I'll be doing my taxes for the next few days. Also, two days from now send me a copy of the INO file that you're using. I want to make sure we're working from the same file. Jack, W8TEE From: Eric Torraca <eric.torraca@...> To: [email protected] Sent: Monday, April 10, 2017 9:16 PM Subject: Re: [BITX20] Tuning with Si5351 and Rotary encoders Good evening all. Well, this is interesting. So, with the if(!digitalRead(ENCODER_BTN)) in the loop, the button presses and movement of the encoder are dramatically magnified. As if someone was holding down the button and spinning the dial very very quickly. I played with the delay in the debouncing section and tried changing the !digitalREAD to digitalREAD (thinking that "!" = "not" and that the code was telling it to change as long as the push button was electrically open.) The good news is that it appears to be tuning and moving the increments simultaneously. So it gives the desired result. Does that tell you anything Jack? 73 de KB1VNA Eric
|
|
Re: Getting closer!
Jack Purdum
A standard Mega won't fit. This is for the Mega 2560 Pro Mini, which is sold on eBay (see?161757319864). Yes, I do plan to make them available for sale and the entire project will be Open Source. The board is larger than the AA board being sold by QRP Guys and is a little more expensive to produce. I hope to sell the board for under $10. The TFT display plugs into the back of it, as the attached picture shows. It is an mcufriend display with SD socket also on the back. I written the code so it works with 2.4", 2.8", 3.5", and 3.95" displays. (The code autosizes at runtime.) The displays are full color and cost less than $10 quantity 1. Dennis (W6DQ), Farrukh (K2ZIA), and I are working on the board and hope to have the AGC, S meter, keyer, and CW mode working before FDIM. Jack, W8TEE |
|
Re: Getting closer!
Jack Purdum
They are available for around $16, quantity 1. I prefer the one that comes with the female header socket, which is what the board I showed is using. Otherwise, you either solder it directly to the PCB (which I don't like) or you supply your own female headers. ?See?161757319864 on ebay. I did buy 25 of them for a club build of the antenna analyzer and managed to get them for $10. Jack, W8TEE From: N8XYN <jimawhitaker@...> To: [email protected] Sent: Monday, April 10, 2017 8:42 PM Subject: Re: [BITX20] Getting closer! I didn't even know that existed, tons of potential I/O on that device.? Thanks On 04/10/2017 08:36 PM, Jack Purdum via Groups.Io wrote: > Mega 2560 Pro Mini |
|
Re: The Users User Manual
开云体育OO Cards are issued by appointed amateurs that have taken a test and are there to help other Amateurs. Better to get an OO card which is advisory than a pink slip from the FCC. ? v/r Fred W4JLE ? ? From: [email protected] [mailto:[email protected]] On Behalf Of William R Maxwell
Sent: Monday, April 10, 2017 8:43 PM To: [email protected] Subject: Re: [BITX20] The Users User Manual ? Who issues Official Observer cards, John? The FCC? Bill, VK7MX - at UTC+10, one day ahead of your time at the moment. ? On 11/04/2017 10:30 AM, John Smith via Groups.Io wrote:
? |
|
Re: Help uploading to Raduino - no port
"I thought most of the latest NANOs had the CH340 USB to serial chip instead of the FTDI chip after the episode with the FTDI drivers bricking the NANOs with counterfeit FTDI chips."
That's the key. The Uno uses a FTDI interface and the Nano uses a CH340. You say that you can compile and upload to the Uno but NOT to the Nano. You need to install the CH340 driver. I think it is included in the latest IDE...but it may not be. In any event, get it and install it as the driver for "USB-2.0-serial". john AD5YE |
Bob Benedict, KD8CGH