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Re: End Fed antennas w/ uBITX
#ubitx
I really fail to see a serious problem with this thread. Sure if ppl don't like a bit of controversy and vigorous discussion then by all means hide the thread but personally? I have learned more from this thread than any other I can remember in the bitx20 group.
Now Ill just have to build a couple efhw? antennas and and do some hands on testing. Ian? |
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Re: uBITx V3 Stuck in Transmit
#ubitx
If it is a continuos carrier the check for short of
blue wire. It should have 5V through
the 4.7K resistor.
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Raj At 29/07/2018, you wrote: Hello All |
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Re: Digital / Audio connector names?
Ian Reeve
¿ªÔÆÌåÓý
They are Molex KK type and widely available through component dealers and eBay.They are 0.1" pitch.Hope this helps.Ian Reeve M0IDR
Get
From: [email protected] <[email protected]> on behalf of Mike Woods <mhwoods@...>
Sent: Sunday, July 29, 2018 1:52:08 AM To: [email protected] Subject: Re: [BITX20] Digital / Audio connector names? ?
Molex KK and on the Far East sites KF2510
Mike ZL1AXG On 29/07/18 11:58 AM, Joel Moerkerk wrote: Hi all,
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Re: uBITX HF transceiver and blue MBITX metal case.
Ian,
? ? ? ? Looks like you have the uBitx case from Sunil Lakhani VU3SUA / amatuerradiokits.in? Attached are the pix for wiring up the Ubitx and the additional boards in the Case. It is documented at various places by VU3SUA. I have downloaded all the pix and put it into a single folder and that should help you. 73 Sunil Sankaranarayanan VU2MTM |
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uBITx V3 Stuck in Transmit
#ubitx
Rodger
Hello All
I have built my uBITX V3 into one of Sunil's [VU3SUA] metal boxs as per instructions supplied. I powered it on to test, and I see the raduino loads the software, but then immediately it goes into CW transmit. Well I was surprised, as I had taken note of the WARNING in section 3.3 "Wiring up the CW Key" and note that I indeed have the 4k7 pull-up resistor installed. I have doubled checked all wiring, measured the resistor to make sure I have the correct value, and cannot find anything wrong. Has anyone else had a problem like his, and how did you fix it? Anyone have good pointer to look at? -- Kind Regards Rodger - ZL1RAH |
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Re: Audio chip burn out.
From my old collection. For your information - QUOTE- One of the best audio amplifier on the market is the TDA2822, which works from 3 volts to 15 volts, when used as a bridge, pumps out a full 1 watt, and most of all, minimum components, just four electrolytics ! Very low noise and absolutely no mains hum. ? There are two versions, the TDA2822, and TDA2822M. I have experimented with both and found that : ?The TDA2822 dip version, is more stable, and rugged, but if you feed more than 9 volts, it gets warm., and a protection circuit pops in and out for protection. ? The TDA2822M is the mini dip version. Does not get warm with 12 volts, but is less stable, and apparently has no good protection circuit. I have blown three ( they are some $3 to $4 for ten pieces from ebay) ! A simple accidental short circuit, and bang it goes. I accidentally touched the input with my soldering iron, with power on, and bang it went. This does not happens with the dip version. ? And, further to my last email, on ebay, you can also find kits with all parts and a PCB to construct an amplifier for as little as $6 shipped if one so desires to go that route. ? cheers, Graham ve3gtc - UNQUOTE On Sun, Jul 29, 2018 at 7:29 AM, MAX <max@...> wrote:
--
One of those ... ...
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Re: Don't discount the rotary encoder as being at issue
RICHARD
¿ªÔÆÌåÓýWhat is the part number for the non-detent one from Digikey? Thanks K6KWQ ? Sent from for Windows 10 ? From: [email protected] <[email protected]> on behalf of BobS KE0REM <rshick@...>
Sent: Saturday, July 28, 2018 6:15:49 PM To: [email protected] Subject: Re: [BITX20] Don't discount the rotary encoder as being at issue ?
Richard et. al.,
I'll have to admit having egg all over my face - my encoder wasn't defective at all, but it was wired incorrectly!? I have one of the Amateur Radio Kits.IN cases which should have made the UBITX wiring straightforward, but I somehow messed up the connections on the front panel board that contains the wiring for the volume control, mic jack, the 1/8 inch PTT Mic, phones and key jacks and the rotary encoder. After tracing the little bit of wiring on that board for the encoder and correcting it, the encoder now works properly.? I do have another question, however.? The knob on my encoder is really sloppy in a radial manner, as if the switch shaft is too small inside the bushing for the encoder housing.? Does the new encoder from DigiKey have less play?? If so, I would probably replace the encoder just to eliminate the "excessive play" in the shaft. Thanks, Bob |
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Re: Audio chip burn out.
MAX
¿ªÔÆÌåÓýThanks tom for being helpful. ? Regards. ? Max K 4 O D S. ? I've Never Lost the Wonder. ? Antique Electronics Site: ? ? From: [email protected] [mailto:[email protected]] On Behalf Of Tom, wb6b ? Here are a couple of links that summarize the audio chip issues. |
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Re: Audio chip burn out.
MAX
¿ªÔÆÌåÓýThank you very much MVS Sarma.? I am always greatful when someone is helpful. ? Regards. ? Max K 4 O D S. ? I've Never Lost the Wonder. ? Antique Electronics Site: ? ? From: [email protected] [mailto:[email protected]] On Behalf Of Mvs Sarma ? the message got jumbled up ?here is it again. you do get pin to pin replacement. search out for NJM 2073 8 PIN DIP THIS HAS BEEN DEALT WITH EXTENSIVELY BY EXPERTS. ? Regards ? On Sat, Jul 28, 2018 at 8:31 PM, Mvs Sarma <mvssarma@...> wrote:
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Re: Audio chip burn out.
MAX
¿ªÔÆÌåÓýThanks a lot smart ass. ? Regards. ? Max K 4 O D S. ? I've Never Lost the Wonder. ? Antique Electronics Site: ? ? From: [email protected] [mailto:[email protected]] On Behalf Of Christopher Miller ? yeah, the audio issues have been dealt with.? |
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Re: Don't discount the rotary encoder as being at issue
BobS KE0REM
Richard et. al.,
I'll have to admit having egg all over my face - my encoder wasn't defective at all, but it was wired incorrectly!? I have one of the Amateur Radio Kits.IN cases which should have made the UBITX wiring straightforward, but I somehow messed up the connections on the front panel board that contains the wiring for the volume control, mic jack, the 1/8 inch PTT Mic, phones and key jacks and the rotary encoder. After tracing the little bit of wiring on that board for the encoder and correcting it, the encoder now works properly.? I do have another question, however.? The knob on my encoder is really sloppy in a radial manner, as if the switch shaft is too small inside the bushing for the encoder housing.? Does the new encoder from DigiKey have less play?? If so, I would probably replace the encoder just to eliminate the "excessive play" in the shaft. Thanks, Bob |
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Re: Digital / Audio connector names?
¿ªÔÆÌåÓýMolex KK and on the Far East sites
KF2510
Mike ZL1AXG On 29/07/18 11:58 AM, Joel Moerkerk wrote: Hi all,
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Re: Receive pitch shifts when confirming....
#arduino
#ubitx
#ubitx-help
Ion,
I managed to get my uBITX on frequency today.? Just used the MM and figured if it was 250Hz off @143000 and 1000Hz off at 166250...then I split the difference by 3 and subtracted that from 143000 to get 135,250 (which is the magic number for my radio). The 10 meter band is right on now according to my K3. Now I just wish the receive would sound? a little cleaner. Are you satisfied how yours sounds? Mine seems better if I lower the IF by 250Hz (IF-250). Also the TX output is terrible on the higher freq bands and carrier null is bad on the lower bands. What is potentiometer RV1 for tx drive? Mine is all the way up. Thanks for your help and being patient with me:) 73's Michael n2zdbv |
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Digital / Audio connector names?
Hi all,
having a great time with my ubitx, but in my hast to assemble with the shortest flying leads possible i was a little over enthusiastic and cut a little short. im wondering what the plugs are known as so as to order a couple of replacements. Thanks for all the awesome info on this list! cheers Joel |
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Re: KD8CEC firmware and basic Manager settings
#ubitx-help
Hi Nigel,
Thank you for your help! I now have my uBITX right on frequency at 28.4 MHz using what I calculated to be the best Master Cal number... Still have to work on the carrier null, power output on high F bands, and audio quality. 73's Michael n2zdb |
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Re: Audio chip burn out.
Here are a couple of links that summarize the audio chip issues.
Putting a resistor in series with the headphone jack can protect against the chip being shorted out. In my case I put two series resistors, one for the right and one for the left channel on the headphone jack. That way I can use either mono or stereo speakers and headphones with the uBITX. Tom, wb6b |
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Re: uBITX and nulling the carrier
#ubitx-help
The BFO being too close is what I also found to be a source of too much 'carrier leakage'.? I think I was getting about 1 to 3 milliwatts leakage when the BFO was set to my liking and transmitting ssb.? .? This was after I had modified the filter by replacing the 5 100 pf capacitors with 5 82 pf capacitors. I had also modified the BITX by replacing the outputs and a few other resistor changes as have been mentioned on here. de ku4pt On Sat, Jul 28, 2018 at 1:49 PM, ajparent1/KB1GMX <kb1gmx@...> wrote: Usually carrier at that level may indicate the BFO needs to be set a bit further away. |
Raj vu2zap