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"uBITX Home Frequency" idea
This is now just an idea. While there are established frequencies for QRP radios, why don't we have frequencies on 80/40 and 20Meters for our users of the uBITX radios? They could be frequencies where we could listen for others and where we could send out a CQ for other users but also not turning down other QRPers. What do you think? Bob ¡ª KK5R |
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Re: Date for publishing Microcontroller Projects for Amateur Radio
fantastic! i have read the very early proofs, this book is going to get a number of people off youtube and onto arduino ide! - f On Thu, Jul 2, 2020 at 10:03 PM Jack, W8TEE via <jjpurdum=[email protected]> wrote:
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Re: Content flagged as objectionable
Although the post is self promotion, it was asked for and I don't think it anyway constitutes spam.? ? It's directly related to microcontroller development, Arduino, etc. I.E. ¦ÌBitx.? On Thu, Jul 2, 2020, 14:27 Arv Evans <arvid.evans@...> wrote:
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Re: Power Mic and uBITX 6
Evan,
Thanks for the quick response!? I am ordering a dummy load so I can do that test and was wondering if I should get a choke as well.? I suppose it wouldn't hurt to have one on hand and could try with and without.? I plan to operate portable so no water pipe to ground to. Thanks! -- Mark, kb9woo Milwaukee, WI uBITX v6 |
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Re: Power Mic and uBITX 6
Mark, kb9woo As you mentioned, others have experienced similar problems.? Several? possibilities may be contributing to the problem. 1)? Coiled cords on microphones have rather high inductance, leading to? TF entering the microphone?input, or to RF being rectified in the microphone? amplifier components.? Coiled cords can still be used if each end is bypassed? for RF with a 0.001 or 0.01 mfc capacitor.?? 2) Overdriving the?microphone inputs can result in spurious RF getting into? the IF filter and causing feedback loops.?? 3)? Microphone amplifiers that are not designed for Ham Radio use may? have internal design problems resulting in RF rectification and resultant? feedback loops. 4) Power supplies that do not provide adequate current can be modulated? by current peaks and result in audio feedback to the microphone circuitry. If practical, a shorter non-coiled cord can be used to see if this changes? the amount of RF feedback and improper operation.? If the power supply is? not capable of?sustained 3 amperes output this could be a problem (more? amperes if an add-on?amplifier is being used).? The power supply regulator? may need RF bypassing to keep its voltage stable during RF peaks. Arv K7HKL _._ On Thu, Jul 2, 2020 at 12:51 PM KB9WOO <kb9woo@...> wrote: I purchased and wired up the power mic that was mentioned in this thread /g/BITX20/message/79613?p=,,,20,0,0,0::relevance,,procom,20,2,0,71576826.? Starting a new thread specifically about this microphone. |
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Content flagged as objectionable
Al? That information was requested by members of this group.?? It is directly related to Ham Radio, including some of the BITX20 projects.
Arv _._ ---------- Forwarded message --------- From: Groups.io <[email protected]> Date: Thu, Jul 2, 2020 at 12:44 PM Subject: [BITX20] Content flagged as objectionable To: <arvid.evans@...> Hello, awhecker@... wishes to inform you that the following message: /g/BITX20/message?id=168492366 is objectionable. They entered the following reason why it should be considered objectionable: ---- spam.? This shill has his own group, but keeps spamming all groups to market his trash. ---- Please take a moment to review and take action as you feel appropriate for your group. Cheers, The Groups.io Team |
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Re: Power Mic and uBITX 6
Mark,
I am using this mike with both v4 and v5 uBITX.? I do not own a v6, however, it is mostly the same as the v5.? For all of them, a setting of 4 to 5 is enough to drive the needle to the same power out as CW with a constant tone or whistle into the mic.? For this test I had a 1000 Hz tone played through my laptop and held the mic about as far away as I would use it.? Lots of variables there, so not a true level adjustment process.? Used it to verify the mic worked. I also had problems with RF getting into the rig and causing two things: 1 - Would lock up the display and stay in transmit mode until I power cycled the rig. 2 - Got reports of distorted audio when I got rid of the lock-up. The tests I did were to transmit into a dummy load to verify that it was RF in the shack.? With that validation, I put a number of snap-on ferrites that fit around the coax at the entry to the shack, and at the connector to the rig. To solve the RF-induced audio distortion I put snap-on ferrites on the mic cord just before the rig. I also grounded the rig to the best ground that I have (a copper cold water pipe). The above was before I bought an RSP1A SDR so that I could use the free spectrum analyzer software to verify the "Splatter" of the audio.? It turns out that on some bands you can drive the output higher than the CW power.? This is on 40 meters where the CW has a dip for some reason.? I now suspect it might be due to losses through the first mixer specific to 40 meters.? To sum up the above, RF is the most likely problem in my opinion.? I would suggest testing with a dummy load to verify that even at high audio settings you do not have the lock-up problem.? After that add common mode current reduction devices (balun being the best) and be sure to ground everything.? Then add the snap-on ferrites to the mic cord. FWIW and YMMV 73 Evan AC9TU |
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Power Mic and uBITX 6
I purchased and wired up the power mic that was mentioned in this thread /g/BITX20/message/79613?p=,,,20,0,0,0::relevance,,procom,20,2,0,71576826.? Starting a new thread specifically about this microphone.
Those who are using this microphone successfully, what level are you setting it at?? Setting mine around 4 or a little less doesn't seem to move the needle at all - same as the Baofeng mic.? Setting it higher than 4 seems to cause the radio to get stuck in TX and sometimes does a bunch of clicking.? I posted a video on another thread of my radio doing this and it was suggested that it may be common-mode current.? I changed my antenna setup and tried again.? I didn't notice "Fast Tune" blinking as it was before, but it still got stuck in TX once.? If I switch to CW and key the mic in order to check my SWR, it comes back good, below 1.5 on 20m.? Switch it back to ssb and key the mic gives me no needle movement unless I turn up the mic and then it gets stuck in TX.? Can't guarantee that is the pattern yet, but that's what I saw on my last test. I'm trying to chase down where my problem is, so knowing what is working for other users of this microphone might help me rule it out. -- Mark, kb9woo Milwaukee, WI uBITX v6 |
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Re: V5.1 and Nextion 5¡±
FYI I used an LM2596 dc to dc converter to drop the 13.8 vdc from P1 to 5vdc to feed my TDA 2030a audio amp, my SSM 2167 mic preamp/compressor and theRaduino ?board.
I bent the raduino1 pin 4 up so it doesn¡¯t set into the socket thus isolating the 13.8 supply from the raduino board. seems to work well. -- ? 73 |
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Date for publishing Microcontroller Projects for Amateur Radio
Jack, W8TEE
All:
A number of you have asked me to post a release date for our Projects book. I just found out that the ARRL plans to start selling our book Microcontroller Projects for Amateur Radio around Sept 15. I do not have a price yet, as they still have some typesetting to do before they have a final page count. -- Jack, W8TEE |
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Re: Help on Microphone
Check the pinout on . the tip is audio, the ring is ptt and the shield is ground. We followed this so that regular audio cables can be directly used between a pc and the speaker/mic of ubitx. About the mic, we know that the mic supplied with ubitx is not the best.? We were originally providing and electretic and builders had to solder up their own mic and ptt. Many found it challenging. We found that the baofeng mics were quiet inexpensive and decided to bundle them to get something to start with. I just checked, an elecraft mic costs 60 dollars with shipping. You could have bought a whole bitx40 with that (if it were in sale). The included mic is reasonably good. That said, the mic do not make much of a difference. Most od the distortion is caused in the PA circuits and the passband, highs and lows are determined by crystal filter. Possibly, in a low distortion transmitter like the microT2 this would make a difference, not for regular, crystal filter or SDR radios. - f On Thu 2 Jul, 2020, 9:22 PM thomas.adair, <thomas.adair@...> wrote: I bought a Btec microphone that has 2 jacks. How can I use this with the uBitx v6?? |
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Re: Ubitx v6.1 cat control
Hi,
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It may help avoid QRMing a QSO in progress if we can hear those. With the digital modes we can *see* on the waterfall or in the spectral display where other QSOs may be. Even if they are too weak to hear. It also helps that these newfangled modes are all piled up together in a small section of the dial. I am a CW guy with maybe a little RTTY thrown in. I can use the sound as well as the waterfall to help find other signals. I they are digital signals I have a switch to turn the sound *off*. I also sometimes can hear other signals that do not show on the waterfall or spectral display. Not having the sound available is depriving you a tool that can help you be a good neighbor. 73, Bill KU8H bark less - wag more On 7/2/20 9:39 AM, Dean Souleles wrote:
Barry - |
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Re: Ubitx v6.1 cat control
Barry -?
I re-read your question and I may have misunderstood what you are asking.? Are you saying you want to be able to hear the FT8 signals as well as send them to the computer?? If so, then yes, a Y connector / splitter should work. For my part - the last thing I want to hear is the digital signals! Dean |
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Re: Ubitx v6.1 cat control
Barry -?
You don't need anything fancy.? If your computer has a headphone and mic outputs you take the headphone out from the computer and connect it directly to the mic input of uBitX.? ?Then take the headphone output of the uBitX and connect it to the mic input of your computer.? ?Just watch the levels - both volume out on the uBitx and speaker volume on the PC so that you don't over-drive either one.? In WSJTX settings you select the microphone input and and headphone output.? ?If you don't have the correct jacks on the PC you can get an inexpensive sound card usb dongle with mic and phone jack - ? 73, Dean KK4DAS |
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Re: V5.1 and Nextion 5¡±
Peter,
As long as you add a heatsink to the onboard regulator, it should be good.? Adding a 2 ohm 5 watt resistor in series with the input to the supply would remove 4.5 watts of dissipation from the regulator at full current, and still keep the input above minimum with a supply voltage of 11 volts.??With 13.8 volt supply, the regulator would need to dissipate 1.5 amps * (13.8 - 3 - 5) volts = 8.7 watts. All of the above assumes that you are drawing the full 1.5 amps.? If a less current draw, the power dissipations go down for all devices.? It also assumes data as defined in an LM7805 from Texas Instruments in the Mouser catalog. FWIW 73 Evan AC9TU |
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Re: Transmit Output Power (CW)
#v5
Thanks Barry, exactly the feedback I was looking for, I'll let you all know how I get on !!
Best regards, Peter. |
Bob Lunsford
Mick
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