How to get rid of tuning clicks in BITX40v3 (version with Raduino module)
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- Опубліковано 9 лют 2017
- To get rid of the tuning clicks insert 56ohm resistor into the power line of DDS board and add two capacitors (1000uF and 100nf, in paralel) between INPUT and GND legs of voltage regulator on DDS board. In my case it works perfectly - no more clicks!
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Hi. I added the capacitors without the resistor and it worked. No more clicks. I also removed the regulator from the board and attached it to transceiver casing with leads to the board. Thank you.
Thank you for tech tip. At first I installed 1000uF and then clicks still there but not as loud. Installed 100pF things got way better. Finally installed 1=56 ohm 1/4W as per your instruction No clicks detected!!! 73 WA9DOH
Hi Larry! Cool that my advice was helpful to you. Btw, BITX40 is very nice rig. I have tried it in the field operation last weekend and I am very happy with its performance on 5-7W only. 73 SQ5WN
Nicely done! Beautiful radio and a very useful mod. Thanks.
Thanks for comment.
Very smart! Thanks for the tips.
I did the mods and the clicking issue is not resolved. I installed a 52 ohm resistor in the 12 volt line to the DDS as well. I removed all of the unused conductors from the connectors. BTW I think your rig looks superb, it appears simple and very nice and clean and great workmanship.
Sometimes the trick works, sometimes not... BITX40 + Raduino are only few weeks on the stage; I hope one day problem of clicks will be solved definitely. Many thanks for remark concernig my rig!
thank you. I am gonna do that.
Thanks and good luck!
Did you use coax for the vfo signal to the main board and antenna connections? I tried that as well and still have very loud clicks when tuning. Have you tried other code for the dds? I don’t like the way it jumps when tuning. I want it to tune at the same rate all the time and not be dependent on speed if the knob. I built a vfo using another type of dds but it didn’t have enough drive for the mixer.
I know this is about a 3 year old video, but I just received a unbuilt Bitx40 V3 with radunio and I have completed the assembly in the enclosure that came with it. It was suffering from the tuning clicks. This video was very helpful and easy to follow. Thanks by the way!! But I have done this mod to my V3 Bitx40 as well as VK3YE mod on the power connections (filtering) and I still have the tuning clicks. I put the resistor at the on/off switch to the orange wire feeding the radunio, I put the 1000uf electro cap and the 104 cap on the input side of the voltage regulator. Still having issues with the clicking. Have I missed something?? Is the resistor value critical??? I couldn't find a 56 ohm resistor, so I used a lower value. Juddie WD8WV
Hi Juddie,
I apologize for the late response. Indeed, I have done experiments with removing clicks a long time ago and I do not remember whether the resistor value is critical. Maybe it's worth checking 56ohm or a little more. By the way I know, the solution I proposed does not work on all copies of this kit.
@@focal28mm okay, thanks for getting back to me. I can live with it, but I hate it clicking when I am tuning. I have made a contact or two already with it. Thanks Juddie WD8WV
Where did you get your case? I like it! Your mic connection is it 4 pin? Can you point me to a website where i can add a mic? Wiring diagran. What brand is your mic?
Hi Todd! As I remember, my case is Z1 one by KRADEX company, bought in local electronic shop. You can google for it - the white version of the case is to buy here: www.tme.eu/gb/details/z-1_b/enclosures-with-panel/kradex/z1wj/
As for the connection of microphone, various mics have different wiring diagram. My connection is 4-pin, and I found via google my model of mic with information on GND, PTT and mic pins location. On the video is my old mic from RADMOR company - wiring is compatibile with Kenwood TS-520. It is dynamic mic, so I've made simple preamp for it. BITX40 board is electret mic ready, so you can use any cheap mic from CB set. I tried ALAN/MIDLAND mic from ALAN 102, 109 and 199 CB-Radio setup, and it worked excellent.
Hi Thank You very much, I did as you said and it worked first time 100%, but I did notice when my volume is set to max, I have a squeal, - but I am not sure if that was always there, Thanks again 73's VE2TSM
Hi Mario, nice that my tip was helpful. I had the same issue with squeal. After shortening of wires connecting DSS board and main board squeal disapeared.
Thanks - I do have it in a temporary enclosure, and I did leave the leads long, with the exception of the antenna leads, thanks for the information (I see it's a problem for many) I will shorten the leads as short as possible, once I find a new home for the unit 73's and thanks again
All the best and 73!
Is the capacitor size critical. Would 470 Ufd work..?
Richard, 470uF would work perfectly. In my case, 1000uF was on hand.
Irealy admire the case your using. I am curious to know how you wired up the red xmt indicator. Did you use a toroid inline with the rf output.
Richard, the TX +12V appears on pin #1 of the K1 relay when the PTT is pressed. So wire the LED between pin #1 and pin #8 (GROUND), and remember to put a current limiting resistor (1K to 1.2K will be fine) in series.
When You are looking at the relay pins from the bottom side of PCB, the number of pins are:
8 GND 1 TX
7 2
6 3 RX
5 4
Thank u very much for the info. I will do that mod.
Good luck Richard!