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Re: Tuning with Si5351 and Rotary encoders
Ok here you go, have to give Ken?G4IIB credit as he shared this code with me. You will need to change the encoder & lcd pins. You will also need to change the USB/LSB bfo frequencies to match your rig and there is a frequency correction of 145000 you will need to change.?
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Re: looking for EMRFD CD
Better check with ARRL. it is copyrighted. 73 Ken VA3ABN On Tue, Apr 4, 2017 at 11:23 AM, Bill K7WXW <k7wxw@...> wrote:
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looking for EMRFD CD
If anyone has one, it will be someone here! I bought a used copy of the re-issued EMRFD, with the CD that has Solid State Design and Intro to RF Design on it. Unfortunately, the CD is damaged. Wondering if anyone has the CD and is willing to share it with me. Can give you a Dropbox to upload it to, or will pay for copying and postage costs to have one mailed. ?Hate to buy another copy of the book to get it... Reply off list to K7WXW at arrl dot net. Thanks and 73 de Bill K7WXW _____________ wag more, bark less. |
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Re: You can't fix stupid (or hurry-up-itis)
John, The crystal was my fault, I broke that little bigger in my efforts to re-attach it. Those SMT parts are really Tony and fragile. I have 3 Nanos on the way, but at least now I can check the rest of the radio until they arrive. A very effective learning experience overall... |
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Re: You can't fix stupid (or hurry-up-itis)
This was one of things I was afraid of doing, I have never built any kits before but I do try to make things that usually don't work.? I read the wire up guide about 3 or 4 times before I even purchased the radio and another 3-4 more time while waiting for it to come.? I walked throught it step by step before putting power to it.? When I powered it up my display was upside down and my mic didn't work.? I wired a 4 pin socket for the mics I already have and used PTT on them.? It explained I needed to put a cap in series as stated in the instruction so I did it that way, when in face it should have been put in parallel with the mic.? I changed the display so it was readable and wired the cap correct and whola!? I like the Bitx so much I ordered another one that got here yesterday.? Gonna put that one together with my 9 year old son.? 73 KM4OUS On Tue, Apr 4, 2017 at 9:49 AM, Andrew Whaley <azwhaley@...> wrote:
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Re: D-104
My turner has a preamp in the bottom i crank it up till i show noise on the scope and then back it down till just before it shows it has great response.? I wish I had a d104 to scream the audio in.LOL On Tue, Apr 4, 2017 at 10:07 AM, Jonathan Peakall <jpeakall@...> wrote:
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Re: D-104
¿ªÔÆÌåÓýI can put it back. So the original element, no preamp, with a cap of what value?Thanks! On 4/4/2017 6:59 AM, Steve Greer wrote:
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Re: D-104
you could have just put a cap across the mic input i didn't mod my mic at all On Tue, Apr 4, 2017 at 9:41 AM, Jonathan Peakall <jpeakall@...> wrote:
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Re: You can't fix stupid (or hurry-up-itis)
Andrew Whaley
You're in good company, I did a similar thing and erroneously wired my function button to +12v instead of ground. Everything worked fine until I pressed the button and then it was as dead as a doornail.? I ordered a pair of Arduino nano's from eBay for ?5 and then spent 2 hours desoldering the fried one and replaced it with the new one. Reprogrammed it and my BitX40 sprang back to life.? It probably pays to contain your excitement and check and double check the wiring before switch-on. |
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Re: D-104
¿ªÔÆÌåÓýI have one without the pre-amp. I just removed the original mic element (carefully so it can be put back) put some foam and an electret element in there and bingo!On 4/4/2017 4:20 AM, Kitty Jack wrote:
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Re: D-104
I use a Turner Super Sidekick just have to make sure it's set on relay and no electronic for the PTT On Tue, Apr 4, 2017 at 7:20 AM, Kitty Jack <rf.jfet@...> wrote:
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Re: Adding speech compression.
This has been an excellent conversation regarding clipping so far, but I feel that a little perspective might add to it further.? While the linked article does contain a good whack of opinion there's also some solid advice about how to talk into your microphone.? May it help you as it's helped me! http://www.eham.net/articles/8069 |
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Re: Adding speech compression.
I tried some more catching up and found something about two diodes back to back act as a clamp and don't conduct until an AC signal is greater than 1.2 or 1.4V peak to peak. I also found something about a double SB RF clipping circuit that said the same thing Farhan said about harmonics that can be filtered away. But I don't know what the two diodes are doing in this case and what is the expected result? How is the results of this different than Peter Parker's hack early on about more punchy audio with lower ceramic caps at C102? Both Parker and Farhan's tips are super easy to try. But I admit I am gun shy now after Tom Medlin W5KUB said he solved the low power problem by removing a smd dual diode. And I replaced them with through hole diodes for absolutely no good reason except to have a very loud birdie at 7.200. I replaced it with an original smd part and had lower birdie noise, and the power was the same because it was R136 all along waiting to be played with. That could have been a pretty good trick to play on a noob. Or just embarrassing for him to have announced the revelation. Ahhh, memories.? So, tell me if I seem to have a fair understanding of RF clipping. And tell me some more to fill in the gaps up there in the first part. And Does Allard have them in the right place, connected to ground? Or should they be in series on that line between the two sections? Here is a link to Peter Parker's video about ?Improved audio from the Bitx40 by varying the carrier oscillator.? https://youtu.be/IELJwapv5qs |
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Re: You can't fix stupid (or hurry-up-itis)
they probably, just got lucky! - f On Tue, Apr 4, 2017 at 10:14 AM, Raj vu2zap <rajendrakumargg@...> wrote: Jerry, |
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Re: Lost all audio
Replace Q13 if the transmit fails.
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Have you switched the antenna back to BITX? At 04/04/2017, you wrote:
I just remembered something that might be important, but might not. I was using the Bitx40 last night and was making a contact. I was really light to him so I switched over to my other radio (TS-520). I forgot to shut off the bitx when I keyed up on the TS-520. It squealed pretty loud, but I let off the mic immediately. I don't know if this has any bearing on this or not. |
bill
Raj vu2zap