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Re: show your mic
MVS Sarma
Max, please check whether the mic body is connected to chasis ground.Regards MVS Sarma
On Sat, Apr 21, 2018 at 11:27 PM, MAX <max@...> wrote:
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Re: Upgrade the software to Allard's version
#radiuno
#bitx40help
#nano
You're welcome.
Please let me know the result. 73 Allard PE1NWL
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Re: show your mic
Gordon Gibby <ggibby@...>
Three pieces of wood, and cheap momentary contact push button.
On Apr 22, 2018, at 04:43, Mvs Sarma <mvssarma@...> wrote:
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Re: show your mic
Max,
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From board to board there will always be some variation of gain. You can increasing the mic gain by reducing the resistor BITX40 - R123 uBITX - R63 You could try the mic gain control I described recently. You could also increase the drive BITX40 - R136 uBITX - RV1 Raj
At 21/04/2018, you wrote:
Speaking of mics, I have to raise my voice almost to the level of shouting to get 5 watts out on 40 meters. Is this normal or should I look for a problem?
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Re: show your mic
MVS Sarma
lovely design Regards MVS Sarma
On Sun, Apr 22, 2018 at 3:08 PM, Gordon Gibby <ggibby@...> wrote:
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Re: Coast to coast on my ubitx yesterday
Hi Tim
I appreciate the links that you have directed at me. Dave k0mbt
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Re: show your mic
chris gress <Chrisg0wfh@...>
My basic mic
On Sun, 22 Apr 2018, 11:00 Mvs Sarma, <mvssarma@...> wrote:
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Re: Help with wiring the audio, mic, and key jacks
VU3WMJ@gmail.com Virtualview
How to store bfo and vfo frequency on ver 2.. help plse......
On Sat, Feb 10, 2018, 5:53 AM Michael Hagen <motdog@...> wrote:
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Re: Help with VFO and BFO frequencies
Skip Davis
We need more information, what radio and what firmware are you using?
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Also you needed to start a new subject line for your question and not use an unrelated topic line it keeps down the confusion. Note I changed the subject line. Skip Davis, NC9O
On Apr 22, 2018, at 09:21, VU3WMJ@... Virtualview <vu3wmj@...> wrote:
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Re: Wanted: your dead uBitx.
#ubitx
docame12@...
I've got one, but I wasn't prepared to give up on it, just yet. I really wanted it working. Maybe I can pay you to fix it? LOL!
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World's BIGGEST BITX?
Bill Meara
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Re: Help with wiring the audio, mic, and key jacks
MVS Sarma
I tried to image the wirinfg as indicated by Asher Farhan using eagle foot print. here is a ping the jack is mounted pins facing upwardsRegards MVS Sarma
On Sun, Apr 22, 2018 at 6:51 PM, VU3WMJ@... Virtualview <vu3wmj@...> wrote:
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Re: Erratic tuning with my new uBitx
Chris Clarke G3SQU
Hi Ian
I'm compiling, uploading and running v1.070 and I still have one issue. I suspect I must have a calibration problem, because in order to achieve a 600Hz CW TX off-set (to match my external 600Hz AF filter) I have had to hard code the call in <ubitx_20> at line 647 si5351bx_setfreq(2, frequency - sidetone + 150) ; I have checked the TX frequency with a my frequency counter and it is definitely off-set from RX by nearly 800Hz when <sideTone=600>, and is correctly offset with my addition of 150. If I just change the value of the variable <sidetone = 450>, the TX offset is then correct but the audio tone frequency is way too low for comfortable listening on RX. With <sidetone = 600> the audio sounds perfect, however the extra 150Hz TX offset applied by the call <si5351bx_setfreq(2, 600)> takes the received signal outside the passband of my external AF filter. Can I change/calibrate one of the program parameters/variables to achieve the same end? I am wary of doing anything via the calibration menu without being sure of not doing something irretrievable. Eg calibrating BFO could have implications I am unaware of, as this is not the simple BFO of which I am familiar from my 1960s analogue receiver days! The problem was the same with earlier firmware versions (eg v1.061) so am I correct to assume that this is a hardware issue requiring calibration in some form? Chris
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Re: Low mic gain, was, show your mic
MAX <max@...>
Hi sarma.
I’m sure I have the polarity correct. Someone on this list posted a drawing showing how to identify the negative terminal and I wired according to it. I think the electret mic wouldn’t work at all if polarity were reversed. What is being powered is an F E T source follower. I think I shouldn’t have to raise my voice to get 5 watts output on 40 meters.
Regards.
Max K 4 O D S.
I've Never Lost the Wonder.
Antique Electronics Site: http://www.angelfire.com/electronic/funwithtubes/
From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of Mvs Sarma
Max, please check whether the mic body is connected to chasis ground. i mean the positive bias voltage for mic should come on independent pin and NOT to the body pin of the eletret element. In case you are using a dynamic mic, perhaps we need more gain and your need to shout appers logical. regards sarma vu3zmv Regards
On Sat, Apr 21, 2018 at 11:27 PM, MAX <max@...> wrote:
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Re: Low Mic Gain, was, show your mic
MAX <max@...>
Hi Raj.
I have the ubitx. Thanks for the suggestions. I see two trimming pots on the board but I haven’t touched them because I have no idea what they do. It appears from your message that one is for adjusting the drive. What is the other one for?
Regards.
Max K 4 O D S.
I've Never Lost the Wonder.
Antique Electronics Site: http://www.angelfire.com/electronic/funwithtubes/
From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of Raj vu2zap
Sent: Sunday, April 22, 2018 4:54 AM To: BITX20@groups.io Subject: Re: [BITX20] show your mic
Max,
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Re: Low Mic Gain, was, show your mic
Skip Davis
Max your uBITX has three trim pots on it. Two are blue square unit labeled RV2 and RV3 these are together on the board and adjust the bias to the finals. The third one is RV1 which adjusts the drive level. There are instructions in the the file section on the group site to adjust the bias pots which may help improve your ssb output if yours isn’t set high enough.
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Try searching the archives to learn about it and the pitfalls you might encounter. Skip Davis, NC9O
On Apr 22, 2018, at 12:53, MAX <max@...> wrote:
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Ubitx.net site correction
#ubitx-help
#ubitx
The ubitx.net site says the wiring diagram for the volume control is incorrect. Its it now correct.
http://ubitx.net/wiring-up-the-volume-control/ ^^ that page should be pulled or updated to reflect that change. A wiki would be a great idea for the community so we can maintain the information together. -W7PEA
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Re: Teensy 3.5/3.6 upgrade for uBITX
Phil KI7WFM
Do you have any prototype adapter boards available? I would like to purchase one if available. I plan on using the Teensy 3.6 and switching to a 128x64 I2C/SPI Oled display.
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Doug W
As a follow up to my post about this heat sink, I did some testing of digital Tx'ing into a dummy load yesterday as I think I have my digital interface set up the way I want. I did not use anything to test the temperature other than touching the MOSFET and heat sink and going by feel. At a full 7 watts out nothing got more than just barely warm at FT8 cycles running for about 15 minutes. At WSPR timing both the IRF510 and heat sink got hot enough I was double checking the junk box to make sure I had a few spare IRF510's. Bottom line, I think this heat sink is ok for occasional FT8 operations at full power (which was all I wanted it for) but if WSPR is your flavor of choice you'll need to crank the power way down. All in all I got what I wanted for about 73¢. I should also mention that although it is hard to tell in the picture the MOSFET is fully sitting on the silicone pad. I lined the pad up with the heat sink overlooking the fact the the IRF510 is angled coming off the board. Fortunately the pad was wide enough to accommodate my error.
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Re: Ubitx.net site correction
#ubitx-help
#ubitx
Jerry Gaffke
We've had a wiki up for a year or more:
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https://groups.io/g/BITX20/wiki/home And it is a good idea. The ubitx.net site offers the alternative of a curated site. Jerry 1000 people editi
On Sun, Apr 22, 2018 at 10:25 am, W7PEA wrote:
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