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Easi link for audio connection - BITX40 and Digital mode

W9HGO #23028 I came across a thread discussing the Easy Digi circuit for connecting to the radio audio. Has anyone in the group investigated the use of the bitx40 for digital modes further? These are friggin long links :)
Randy Hall All Messages By This Member #23040 Hi I was using my Easy Digi card to interface my iPhone to my BITX40.? I built a couple of these to interface HTs to iPhones when I was playing around with 2M SSTV. I posted two videos about this interface. ? ? So, I was using the interface with my iPhone for some transmitter testing. I did using a spectrum analyzer?on his phone to look at receiver bandwidth. So, I wondered if there were any function generators for the iPhone. I found this . It has tones, sweeps, and noise generators. I did pay the extra couple of $$s to use the noise and sweep generators.? I used the noise generator to transmit through the BITX40 and viewed the result on my K3/P3. I have also used a couple of resistors 47K/1K as a resistor voltage divider followed by a .15 uF cap in series feed the BITX40 from the iPhone. I haven't tried using the Easy Digi interface for any of the digital modes, yet. I think PSK may work with the BITX40 using LSB. PSK doesn't care about LSB/USB, except for figuring out what frequency you are using. I also wired up a toggle RV/XMIT switch across the PTT button, to free up a hand during testing. Have fun, Randy, K7AGE BITX40 SN 139 toggle quoted message Show quoted text On Mon, Mar 6, 2017 at 11:05 PM, W9HGO <radiow9hgo@...> wrote: I came across a thread discussing the Easy Digi circuit for connecting to the radio audio. Has anyone in the group investigated the use of the bitx40 for digital modes further? These are friggin long links :)
Dr Fred Hambrecht All Messages By This Member #23041 开云体育 Randy, You can take those crazy long URLs to tinyurl.com and it will turn them into small urls that are easy to copy. ? v/r Fred W4JLE ? toggle quoted message Show quoted text From: [email protected] [mailto:[email protected]] On Behalf Of Randy Hall Sent: Tuesday, March 7, 2017 9:29 AM To: [email protected] Subject: Re: [BITX20] Easi link for audio connection - BITX40 and Digital mode ? Hi ? I was using my Easy Digi card to interface my iPhone to my BITX40.? ? I built a couple of these to interface HTs to iPhones when I was playing around with 2M SSTV. ? I posted two videos about this interface. ? ? ? So, I was using the interface with my iPhone for some transmitter testing. I did using a spectrum analyzer?on his phone to look at receiver bandwidth. So, I wondered if there were any function generators for the iPhone. I found this . It has tones, sweeps, and noise generators. I did pay the extra couple of $$s to use the noise and sweep generators.? I used the noise generator to transmit through the BITX40 and viewed the result on my K3/P3. ? I have also used a couple of resistors 47K/1K as a resistor voltage divider followed by a .15 uF cap in series feed the BITX40 from the iPhone. ? I haven't tried using the Easy Digi interface for any of the digital modes, yet. I think PSK may work with the BITX40 using LSB. PSK doesn't care about LSB/USB, except for figuring out what frequency you are using. ? I also wired up a toggle RV/XMIT switch across the PTT button, to free up a hand during testing. ? Have fun, ? Randy, K7AGE BITX40 SN 139 ? ? ? On Mon, Mar 6, 2017 at 11:05 PM, W9HGO <radiow9hgo@...> wrote: I came across a thread discussing the Easy Digi circuit for connecting to the radio audio. Has anyone in the group investigated the use of the bitx40 for digital modes further? These are friggin long links :) ?
N0ECK All Messages By This Member #23042 Investigate, yes. Implement, not yet. Those easy-digi boards are simple but effective as an isolator and a serial ptt. If you don't have a serial port, you'll need a USB to serial converter anyway so you could probably build something closer to this. (shameless plug, I made the video. It is aimed at non-builder types.) The biggest hurdle I've found so far is making the rig work on USB instead of LSB.?
Randy Hall All Messages By This Member #23043 Fred I believe my links were embedded within the text of my message. I also use Google's Shortener. It was W9GHO that commented about the long links. Randy
W9HGO #23051 开云体育 Looks like the idea for using the BITx40 on digital modes is not as straightforward as I would have liked. I may order it just as an educational project - always had trouble with C, this might be the place to finally get the hang of it I tried using google to shorten them but it just sent me an error. Did finally get curly for chrome and it worked fine. Randy, I like what you did with the Iphone - In fact I was just checking out SSTV I can use these on my Ipad. Thanks again to everyone who responded to my quest. 73 Harry W9HGO On 3/7/17 10:03, Randy Hall wrote: toggle quoted message Show quoted text Fred I believe my links were embedded within the text of my message. I also use Google's Shortener. It was W9GHO that commented about the long links. Randy
Randy Hall All Messages By This Member #23054 Harry, Should work on the iPad too.? For PTT, the HTs that I was using both provided VOX. ?It includes a simple VOX to generate PTT. Randy, K7AGE toggle quoted message Show quoted text On Tue, Mar 7, 2017 at 11:30 AM, W9HGO <radiow9hgo@...> wrote: Looks like the idea for using the BITx40 on digital modes is not as straightforward as I would have liked. I may order it just as an educational project - always had trouble with C, this might be the place to finally get the hang of it I tried using google to shorten them but it just sent me an error. Did finally get curly for chrome and it worked fine. Randy, I like what you did with the Iphone - In fact I was just checking out SSTV I can use these on my Ipad. Thanks again to everyone who responded to my quest. 73 Harry W9HGO On 3/7/17 10:03, Randy Hall wrote: Fred I believe my links were embedded within the text of my message. I also use Google's Shortener. It was W9GHO that commented about the long links. Randy
kj6etl All Messages By This Member #32211 I would like to create a 2nd audio in/out for digital mode only and adjust the volume for the speaker seperately. Appliance operator here who bought a BitX40. Any advice about where to tap into the audio on the board before amplification? Alteratively I could connect the "Easy Digi" to the current audio, adjust the gain and put a seperate audio amplifyer behind it for the speaker. Any toughts arround this?
John P #32213 On Tue, Mar 7, 2017 at 06:43 am, Dr Fred Hambrecht wrote: You can take those crazy long URLs to tinyurl.com and it will turn them into small urls that are easy to copy. The problem with that is that they are only good for 30?days. A better solution is to use the "link" capability in the message editor here, which allows you to simply make some text in your message a link. Here are W9HGO's links: , . ? -- John - WA2FZW
Ryan Flowers All Messages By This Member #32216 You can take audio from pin 3 on the LM386 chip, and ground anywhere. That'll get you unamplified audio signal for digital mode. Works fine :)? -- Ryan Flowers W7RLF ? ?<-- Learn how to go digital on the BITX40
Jerry Gaffke All Messages By This Member #32217 Pin 3 of the LM386 will vary in amplitude with where you set the existing volume control. You may want to instead take audio from pin 1 at the top of the the existing volume pot,? perhaps have a second independent 10k volume pot for your digital mode audio. toggle quoted message Show quoted text On Sat, Sep 9, 2017 at 05:23 pm, Ryan Flowers wrote: You can take audio from pin 3 on the LM386 chip, and ground anywhere. That'll get you unamplified audio signal for digital mode. Works fine :)?
Ryan Flowers All Messages By This Member #32218 Thanks Jerry. I was going from memory there. I indeed took it from pin 1. -- Ryan Flowers W7RLF ? ?<-- Learn how to go digital on the BITX40

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