Re: BITX 40 (Pre-Raduino) Sanity Check Please
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Re: BITX 40 (Pre-Raduino) Sanity Check Please
Go into the calibration mode and adjust it so it reads true .
On Thu, 2 Mar 2017 at 19:59, AndyH <ahecker@...> wrote: I've confirmed today that while my VFO appears to be doing what it's supposed to be doing (generating a square wave that properly shifts frequency between 5.0 and 4.7 MHz), that the frequency display on the LCD is 1500 Hz low. ?To transmit and receive on 7280 I have to tune to 7281500. As I've not yet seen this reported here or in the portion of the interwebz accessible via Google searches, and I've not seen any allowance for such an adjustment in the various bits of Arduino code floating about, I'd like to ask if anyone else has experienced this or knows of a similar challenge. Thanks in advance, Andy
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Re: BITX 40 (Pre-Raduino) Sanity Check Please
Hi Cor, ? ?What appears to be a 1500 Hz shift is consistent across the range from 7,0 through 7,3. ?I've been using my SDR-Play as the 'test' receiver. ?It appears to be accurate relative to WWV on 5 and 10 MHz. ?I haven't been able to identify the actual pass band of either the crystal filter or the filter using L1/L2/L3 - my learning hasn't progressed that far yet. :) Andy ? ?
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Re: BITX 40 (Pre-Raduino) Sanity Check Please
On Thu, Mar 2, 2017 at 12:10 pm, Jack Purdum wrote: What software are you using with it? If not the standard Raduino code, which version is being used.
Jack, W8TEE
?Hi Jack, ? My board's pre-radiuno days - received last December. ?The VFO's an Arduino Micro and an Adafruit Si5351 board. ?The code began life as AK2B's multi-featured VFO and I'm using the 'direct conversion' portion. ?The basic process is: BFO-VFO ?si5351.set_freq(1200000000 - (vfo * SI5351_FREQ_MULT), SI5351_CLK0); ?I think I attached the code. ?Most of the changes I made were for the differences between the Micro and Nano. ? I'm using 12,000,000 as the BFO freq. ?I found that when I calculate off the actual 11,9985 freq that my transmit signal is weak (3-4 W out with R136 adjusted for max input/output and yelling into the mic). ?On the SDR waterfall, the output signal looks like contains a portion of two side bands. ?The dial display is in sync, however. ?Using 12,000,000 gives me an intelligible output signal that looks like a 'proper' SSB envelope on the waterfall. ?With R136 at about 45% of full travel, slightly louder than normal conversation volume produces a solid 7W output with peaks approaching 10W. ?I had a 'proper' QSO with the radio in this configuration and the signal was clear enough. ?I just have to tune 1500 Hz higher on the display to get the expected frequency for transmit and receive. ?I'm beginning to wonder if one of the filters is off. ?I don't yet know how to measure the pass band. ?Would I have to break the input and output of the filter and then sweep the filter? Andy
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Re: New video from Aahhar - Micro BITX
Cw is already in the bitx40 code, you need to uncomment it in the code.
Try it and let us know.
?
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Re: New video from Aahhar - Micro BITX
?Please give us the "cw" ?hack on the? new Micro BITX so we can put it into the BITX40 with Arduino VFO 73? Ralph? K1KOB ? ? On 03/02/17, Marc Jones via Groups.Io<gw0wvl@...> wrote:? Does this new BITX have a AGC circuit built in ? ?Thanks .
Regards?
On Thu, 2 Mar 2017 at 19:39, Rahul Srivastava via Groups.Io Hi!
Good news travels fast...!!!
73
Rahul VU3WJM
On Friday, 3 March 2017 12:28 AM, Ashhar Farhan <farhanbox@...> wrote:
I am prepping the write up, soon...
- f
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Re: New video from Aahhar - Micro BITX
Does this new BITX have a AGC circuit built in ? ?Thanks .
Regards?
On Thu, 2 Mar 2017 at 19:39, Rahul Srivastava via Groups.Io <vu3wjm@...> wrote: Hi!
Good news travels fast...!!!
73
Rahul VU3WJM
On Friday, 3 March 2017 12:28 AM, Ashhar Farhan <farhanbox@...> wrote:
I am prepping the write up, soon...
- f
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Re: BITX 40 (Pre-Raduino) Sanity Check Please
Andy, I didn¡¯t read your subject line carefully, I assumed you had the Raduino which is not the case, I see now. My remarks about calibration were not very helpful then. ? Cor ¨C PA4Q ?
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Van: [email protected] [mailto:[email protected]] Namens AndyH
Verzonden: 2 March, 2017 20:59
Aan: [email protected]
Onderwerp: Re: [BITX20] BITX 40 (Pre-Raduino) Sanity Check Please? I've confirmed today that while my VFO appears to be doing what it's supposed to be doing (generating a square wave that properly shifts frequency between 5.0 and 4.7 MHz), that the frequency display on the LCD is 1500 Hz low. ?To transmit and receive on 7280 I have to tune to 7281500. As I've not yet seen this reported here or in the portion of the interwebz accessible via Google searches, and I've not seen any allowance for such an adjustment in the various bits of Arduino code floating about, I'd like to ask if anyone else has experienced this or knows of a similar challenge. Thanks in advance, Andy
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Re: BITX 40 (Pre-Raduino) Sanity Check Please
? >>To transmit and receive on 7280 I have to tune to 7281500.<< If you mean that the center of the RF pass band is on 7280 then you have exactly what is intended. If this is the frequency of the suppressed carrier you are 1.5 kHz off indeed. This can be adjusted by the calibration feature that is in the basic Raduino firmware. Search for ¡°calibration¡± in the group messages. It has been mentioned lots of times in connection with a discussion of the colour of the wire to be used. ? 73, Cor ¨C PA4Q
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Re: BITX 40 (Pre-Raduino) Sanity Check Please
What software are you using with it? If not the standard Raduino code, which version is being used.
Jack, W8TEE
From: AndyH <ahecker@...>
To: [email protected]
Sent: Thursday, March 2, 2017 2:59 PM
Subject: Re: [BITX20] BITX 40 (Pre-Raduino) Sanity Check Please
I've confirmed today that while my VFO appears to be doing what it's supposed to be doing (generating a square wave that properly shifts frequency between 5.0 and 4.7 MHz), that the frequency display on the LCD is 1500 Hz low. ?To transmit and receive on 7280 I have to tune to 7281500. As I've not yet seen this reported here or in the portion of the interwebz accessible via Google searches, and I've not seen any allowance for such an adjustment in the various bits of Arduino code floating about, I'd like to ask if anyone else has experienced this or knows of a similar challenge. Thanks in advance, Andy
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Re: BITX 40 (Pre-Raduino) Sanity Check Please
I've confirmed today that while my VFO appears to be doing what it's supposed to be doing (generating a square wave that properly shifts frequency between 5.0 and 4.7 MHz), that the frequency display on the LCD is 1500 Hz low. ?To transmit and receive on 7280 I have to tune to 7281500. As I've not yet seen this reported here or in the portion of the interwebz accessible via Google searches, and I've not seen any allowance for such an adjustment in the various bits of Arduino code floating about, I'd like to ask if anyone else has experienced this or knows of a similar challenge. Thanks in advance, Andy
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Re: New video from Aahhar - Micro BITX
Hi!
Good news travels fast...!!!
73
Rahul VU3WJM
On Friday, 3 March 2017 12:28 AM, Ashhar Farhan <farhanbox@...> wrote:
I am prepping the write up, soon...
- f
On Fri, Mar 3, 2017 at 12:15 AM, Randy Hall <listk7age@...> wrote: Hi He calls this the Micro BITX. He shows some operations of the radio. Randy, K7AGE #139
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Hello,
This email message is a notification to let you know that a file has been uploaded to the Files area of the [email protected]
group.
File: BITX_Radruino_GPS_VFO.ino
Uploaded By:
gene marcus
Description:
This project is based upon the Arduino Controlled GPS Correct VFO that was
published in the July/August 2015 QEX magazine. The sketch is modified to
work with the BITX Raduino Si5351A VFO.
You can access this file at the URL:
/g/BITX20/files/Raduino%20Multi-Band%20GPS%20Corrected%20VFO/BITX_Radruino_GPS_VFO.ino
Cheers,
The Groups.io Team
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Re: New video from Aahhar - Micro BITX
I am prepping the write up, soon...
- f
On Fri, Mar 3, 2017 at 12:15 AM, Randy Hall <listk7age@...> wrote: Hi He calls this the Micro BITX. He shows some operations of the radio. Randy, K7AGE #139
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New video from Aahhar - Micro BITX
Hi He calls this the Micro BITX. He shows some operations of the radio. Randy, K7AGE #139
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Now work ok????....RX and TX, rx current 0.16 A, TX current 0.80 A, i dont understand but never more the PA mosfet have temperature...thanks to all, now think how could put a S Meter, and a RIT, maybe with arduino code?
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Re: BITX 40 (Pre-Raduino) Sanity Check Please
Andy, How are you measuring the center of the pass band? Have you been able to measure the center of the IF pass band? ?The BFO frequency will be above this pass band, since it is a LSB signal in the BITX40. The IF crystal filter is at a nominal 12 MHz frequency, the exact value will differ. Is the error you are seeing different when you tune to 7,2 MHz then to 7,0 MHz? Did you compare your received signals and the perceived frequency with another receiver? The Raduino has a calibration feature, with which you can zero the error between displayed and received frequency, this might solve your problem. ? 73, Cor ¨C PA4Q Thank you Cor and I agree about tracking the suppressed carrier. ?I guess what I think I'm seeing and measuring is that the pass band is 3K lower than I'd like it to be. I expect that if I tune to 7.2 (suppressed carrier location) that the center of the LSB pass band is 7198500. ?When I tune to 7.2, the center of the transmit band is closer to 7197000. I'd like to be able to dial-in 7200000 and know that the receive and transmit pass band is 7198500...maybe plus/minus 50. ?I really don't know how much precision or accuracy I should expect at this point. 73?
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Re: BITX 40 (Pre-Raduino) Sanity Check Please
Thank you Cor and I agree about tracking the suppressed carrier. ?I guess what I think I'm seeing and measuring is that the pass band is 3K lower than I'd like it to be. I expect that if I tune to 7.2 (suppressed carrier location) that the center of the LSB pass band is 7198500. ?When I tune to 7.2, the center of the transmit band is closer to 7197000. I'd like to be able to dial-in 7200000 and know that the receive and transmit pass band is 7198500...maybe plus/minus 50. ?I really don't know how much precision or accuracy I should expect at this point. 73?
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Re: GPS corrected Arduino controlled VFO
Thanks Gene, ?Please allow me a copy . In the absence of GPS , perhaps Arduino can internally manage? 1pps employing accurate? 1sec pulse-"roman balck's code". ? ?Thanks and regards ?sarma ?vu3zmv
On Thursday, 2 March 2017 8:22 PM, Art Olson <olson339@...> wrote:
Gene
I would like a copy also. You could post it on the web site also.?
Art N2AJO
Sent from my iPhone
On Mar 2, 2017, at 9:17 AM, Tore Bonderudt?jet via Groups.Io < lb4rg@...> wrote: Bob
I would be interested ?
in the?Raduino. code mod Art lb4rg
On Saturday, February 18, 2017 11:32 PM, gene marcus <gmarcus@...> wrote:
Hello Bob,
I authored the article that you are referring to. The article is located
at: < >. ??I recently
modified the code to run on the Raduino. ?GPS frequency correction?is optional. If anyone is
interested in receiving a copy of the Raduino?version just send me an email.
Gene W3PM GM4YRE
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Re: A simple recipe for clean Bitx40 CW
Measure the voltage drop across the 1k resistor while transmitting to determine current into the modulator, divide 9v by that current to determine the new resistor value.
On Thu, Mar 2, 2017 at 06:37 am, Jerry Gaffke wrote: Should be consistent enough that the pot and 1k resistor could both be replaced with a single fixed resistor of some value that you must determine to give 5 Watts out, that same value should work well in other Bitx40's as well. ?
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Marc Jones