Re: M6YPA's 3D Printed Case and Microphone
Oops, editing mistake on my part. I thought I had added that already. Refresh the article, the link is now posted, as well as a link to the microphone design source.
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Ryan Flowers KC7RYS?
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Thanks Rob, Ile have a decent look later , Fire up the PC , Only so much I can do with the smart phone ..
Regards
On Thu, 9 Feb 2017 at 10:01, G4NQX <tasmod@...> wrote: Marc, Look in the Files section, possibly second page, for "BitX40 sketch using new si5351 library v2 "? The sketch and library are in there.? It's the Raduino sketch with two words changed to suit the new v2 library.
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Rob G4NQX
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Thanks Rib, Ile fire up the PC when home and have a Decent look .... The smart phone is OK but limited ...?
Regards?
On Thu, 9 Feb 2017 at 10:01, G4NQX <tasmod@...> wrote: Marc, Look in the Files section, possibly second page, for "BitX40 sketch using new si5351 library v2 "? The sketch and library are in there.? It's the Raduino sketch with two words changed to suit the new v2 library.
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Rob G4NQX
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Marc, Look in the Files section, possibly second page, for "BitX40 sketch using new si5351 library v2 "? The sketch and library are in there.? It's the Raduino sketch with two words changed to suit the new v2 library.
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Rob G4NQX
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Re: M6YPA's 3D Printed Case and Microphone
Got a link to the files?
Rich KC8MWG
On Thursday, February 9, 2017 4:17 AM, Ryan Flowers <geocrasher@...> wrote:
Hello everyone, Adrian shared with me how his 3D printed case came to be about. It's a beautiful build, and he even shared the files so you can 3D print your own. Have a look! Also if anyone has a build they'd like to share, email me kc7rys at gmail dot com. 73! --
Ryan Flowers KC7RYS?
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M6YPA's 3D Printed Case and Microphone
Hello everyone, Adrian shared with me how his 3D printed case came to be about. It's a beautiful build, and he even shared the files so you can 3D print your own. Have a look! Also if anyone has a build they'd like to share, email me kc7rys at gmail dot com. 73! --
Ryan Flowers KC7RYS?
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Dear friends, Can I use 150 Watts Linear of NKK directly.. Is it enough the output of Bitex to load linear?
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Hi Steve , The little BITX-40 sure is a good little radio, Since having mine I've not used my other more expensive radios, I like mine so much I bought a second BITX-40 for the mobile , I've started getting back into PCB building and modding circuits , It's great fun , And all at such a low cost ..... Who says Ham Radio has to be expensive .
Regards
On Wed, 8 Feb 2017 at 23:32, sigcom1 <sigcom@...> wrote: Delivered with today's (Wednesday, 02-08) mail. ?Carton was crunched on one corner and a bit damp but contents were safe inside the nice plastic box. ?All components inventoried and accounted for but I'll have to wait until I finish my QRPGuys PARA80SET kit before I start this one (but it certainly is tempting). ?I was wondering what I was going to use for a housing and I've decided to put it in the plastic box it came in; it's the perfect size! 73.......Steve Smith WB6TNL ? ? ? ? ? ? ? ? :"Snort Rosin"
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Hi Fred, I would very much like the Sketch ?for the BITX-40 ... I would then try having a play around with it, Although my programming is very rusty for sure ...
Regards
On Thu, 9 Feb 2017 at 1:06, Dr Fred Hambrecht <AAR4MI@...> wrote: The formula for upper and lower sideband is explained in the sketch. Simply uncommenting a few lines and adding the Fbutton will allow you to switch between U/L SSB. I am setting mine up this way to allow USB for use on MARS. Mars uses USB regardless of frequency. I am also encoding split mode. This has been a total blast and a learning experience playing with this BITX40. ? v/r Fred W4JLE ? From: [email protected] [mailto:[email protected]] On Behalf Of Lawrence Macionski via Groups.Io
Sent: Wednesday, February 08, 2017 12:41
To: [email protected]
Subject: Re: [BITX20] SDR kits VFO ? QUOTE- "If you set the VFO frequency to 26 MHz, the sideband is automatically inverted. You will not need to move the BFO from LSB to USB for 14 MHz". Then if that is true then setting the VFO frequency to 19Mhz? (19-12=7) will invert- (USB) for 7Mhz? Then enabling Digital modes?? Something the Raduino could do? Advise.... de W8LM -KANSAS
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You can only go Positive with the SDR kits VFO...
On Thu, 9 Feb 2017 at 6:30, marjannorm@... <marjannorm@...> wrote: Hi, when you put in the IF frequency, you did remember the negative off-set didn't you? kind regards Norm vk5gi McLaren Vale South Australia
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Hi, when you put in the IF frequency, you did remember the negative off-set didn't you? kind regards Norm vk5gi McLaren Vale South Australia
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Re: Possible PA low output problem. Problem SOLVED
This problem has made me and my equipment look pretty bad. I am not sure changing out the PA was a real fix. All I know is, it's not performing like it has enough power. Whether it is low audio drive from the mic, damaged PA, or this dual diode thing. And it seems like a lot of people are having the same weak problem. I've only heard of analog Bitx 40 owners making contacts. If the VFO holds still long enough. I'd like to know more before I cut or remove anything. On my board I have a 3 pin smd part labeled D-20,?IL440. It looks like I would have to solder through hole diodes to the 3 D-20 smd pads. Or to the D-15, D-16 pads and some jumpers across the balance pot, and I think the D-20 pads too. I don't want to go out and look again. I have a strip of 1N4148 diodes. Would I have to check them for matched forward voltage drop? A perfect pair? I got two cheap DMM's and a?12864 Mega328 component tester. Anything else I should know?
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Re: New BITX40 on the air.
Unfortunately the check is not trivial. ?At least not yet.?
On Wed, Feb 8, 2017 at 09:21 pm, John Backo wrote:
In fact, it is a good thing for everyone with a new rig to check those diodes. There might be a
universal problem there, The fix is easy as W5KUB noted.
?
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Re: New BITX40 on the air.
Sounds like you two could have the bad diode problem (D15 and D16).
See the thread on "Possible PA low output problem. Problem solved." I would take a look at that first.
Symptoms: Low output; Broadcasting a carrier like CW. No SSB.
In fact, it is a good thing for everyone with a new rig to check those diodes. There might be a
universal problem there, The fix is easy as W5KUB noted.
john
AD5YE
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Re: Possible PA low output problem. Problem SOLVED
No. ?Most of the current through the diodes is coming from the BFO, and since that is mostly balanced it doesn't show up at R39. ?I have no idea what that current would be, but possible it's too high for the poor little diode pair. ?And could be we need the 100 ohm balancing pot (or a couple 50 ohm resistors) just to tame that current.
On Wed, Feb 8, 2017 at 09:02 pm, Jerry Gaffke wrote:
?If we knew the signal level at R39 while transmitting 7W, ?would tell us the appropriate value for the resistor to match that current. ?
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Re: Possible PA low output problem. Problem SOLVED
I assume there's a scrap of wire across what was the balancing pot at R106. ?Could remove that wire to leave one end of both diodes dangling. ?Then measure forward and reverse current through each diode from a 5v source through a series resistor. ?If we knew the signal level at R39 while transmitting 7W, ?would tell us the appropriate value for the resistor to match that current. ?Unlike using ohmmeters of various construction, this should give consistent readings. Could be the dual diode got partially damaged by heat when soldered in place, giving it a too-high a forward resistance. ?Would be interesting to compare a reading taken using a scheme like the above method on the damaged diode vs a good one. Jerry, KE7ER
On Wed, Feb 8, 2017 at 08:07 pm, Jerry Gaffke wrote: Would be good to figure out a way to check for this fault without unsoldering the dual diode. ?Ohmmeter readings won't quite do it. ? ?
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Re: Possible PA low output problem. Problem SOLVED
Diode tests good with fluke DVM out of the circuit but it would not function correctly in circuit. Replacing the diodes corrected the problem.?
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Re: New BITX40 on the air.
That¡¯s what mine does too. I haven¡¯t started troubleshooting yet. Mark K3MRK ?
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From: [email protected] [mailto:[email protected]] On Behalf Of jerry grzelak
Sent: Tuesday, February 07, 2017 11:57 PM
To: [email protected]
Subject: Re: [BITX20] New BITX40 on the air.? No ssb modulation Press the ptt? no modulation with no mic she puts out a cw note o well kg6mn ? Sent from for Windows 10 ? ? Got my BITX-40 this evening.? Built it up and got it working well.? I had a inductor with a broken wire, but after soldering it back on the board, all works great.? First contact was IK8ETA, then a Florida station.? Good stuff on 7W! ? Look forward to getting this thing boxed up and looking better! ? ? Jason N3YUG ? ?
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Re: Possible PA low output problem. Problem SOLVED
Simple, just disconnect the T4 leads to the diodes and then test with a
diode tester on multimeter!
Raj
At 09/02/2017, you wrote:
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Would be good to figure out a
way to check for this fault without unsoldering the dual diode.?
Ohmmeter readings won't quite do it.??
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Re: Possible PA low output problem. Problem SOLVED
Would be good to figure out a way to check for this fault without unsoldering the dual diode. ?Ohmmeter readings won't quite do it. ?
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Marc Jones
Raj vu2zap