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Re: New uBITX Ver. 6 Assembled Today
Ashhar,
I draw .322 on RX and 1.47 Cw and shouting the loudest I can I draw about 1.5 amps at exactly 12 Vdc. I¡¯m running a new MFJ 1984 endfed antenna that is supposed to be tuned at the factory, however until I get an SWR meter I won¡¯t know for sure. 73 Mick VA3EPM? |
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Re: #v5 Audio, Ground?
#v5
Hello Armando,
if it is an amateurradiokits.in then they do have an issue with the V5 board. I had to grind off the bump in the case ?right underneath the board with the headphone connector so it would not short out the speaker.? |
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Re: New uBITX Ver. 6 Assembled Today
The Antuino from hfsignals is also well worth considering.
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It can measure the SWR of an antenna, and with an appropriate resistive attenuator it can measure the power output of a transmitter. Unlike any of the other instruments mentioned, it can measure very low level RF signals and can scan the entire HF radio spectrum looking for spurs and harmonics. So can be a spectrum analyzer of sorts (which the nanoVNA cannot do). The antuino should be easier to learn to use than a nanoVNA. The thing that makes the nanoVNA more powerful (and more difficult) is that it can measure resistance and reactance separately, rather than lumping them together as SWR does. Either the nanoVNA or the Antuino could be used for determining the passband of a filter, but the nanoVNA would also give you information about the phase difference between the voltage and current.. Jerry On Thu, Jan 9, 2020 at 05:35 PM, Jerry Gaffke wrote:
One trick I've used? is to see how hot a 50 ohm resistor gets, |
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Re: #v5 Audio, Ground?
#v5
I remember reading posts that had the same issue.? It was traced to a clearance issue between the aux board and the v5 board.? When installed the 3.5 mm jack terminal was shorting out.? I would check that.
73 Evan AC9TU |
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Re: Need to Calibrate the V6
#v6
That request would be best served by creating an "issue" here:
I've noticed that it reverts to default as well, and I agree it might be nicer to show the current value, rather than default every time, but these suggestions will get buried in the threads if they don't get acted on immediately, or logged somewhere like the issues page. Reed |
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Re: compile error
Jack, W8TEE
It would help us figure it out if you pasted the error here, too, and detailed the IDE number, your Op System, and if you copied all of the files into the same directory. Jack, W8TEE
On Thursday, January 9, 2020, 9:57:34 PM EST, Bob Bennett via Groups.Io <bobsmacbox@...> wrote:
Anyone know how to overcome the EEPROM.put (CW_KEY_TYPE_temp_key) error that keeps coming up in my ubitxv6 compile? -- Bob NZ2Z -- Jack, W8TEE |
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Relative Power indication on Nextion display
I¡¯m running the basic CEC software (not _S version) using the LM358-based S-meter sensor Ian offered on his site to drive the S-meter function on the Nextion display. To attempt relative power indication, I Incorporated the concept from his ¡°simpler¡± version (without the LM358), tapping off the antenna connector to provide input to the IC to approximate power level.
My hybrid version is producing appropriate output on the A7 line during both receive and transmit. ?However, while the Nextion display works fine during receive, it does not show any indication of the value (on A7) during transmit. ?Does the CEC software turn off the ¡°meter¡± feature during transmit? ?If so, is there a setting to change that, or a compile time declaration to make it active? Thanks. |
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Re: New uBITX Ver. 6 Assembled Today
We need a more objective criterion ti assess what is happening. If the local radio ia picking up the modulation then the mic can't be a suspect. If the receiver is working then there is a negligible chance that the ssb tx ia busted. Rememeber that it was shipped working. Can you measure the power supply current? If you can, then measure how much it draws when you shout 'Haaaaaallow' into the mic. The current draw increase on 7mhz should be over 1.5A at peak. I hope you have used a matched antenna. - f On Fri 10 Jan, 2020, 7:06 AM Jerry Gaffke via Groups.Io, <jgaffke=[email protected]> wrote: One trick I've used? is to see how hot a 50 ohm resistor gets, |
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Re: New uBITX Ver. 6 Assembled Today
One trick I've used? is to see how hot a 50 ohm resistor gets,
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Compare that to how hot a resistor on a variable voltage DC supply gets, vary the voltage till the heating is about the same then compute watts from V*V/R A diode RF probe is trivial to build, though involves a wee bit more math to interpret properly.. V*V/R = Watts, so V*V=Watts*R, and five watts into 50 ohms is sqrt(Watts*50ohms) = sqrt(5*50) = 15.8 volts rms. If the RF probe is peak reading, you will see 15.8 * 1.414 = 22.4 volts peak into a DC voltmeter. Many RF probe designs include a 4.7meg scaling resistor so it reads rms? on the assumption that the RF is a sine wave and the DVM has an input resistance of around 10meg. Those are some very large assumptions, I prefer to have it honestly tell me the peak voltage. Let's assume a 1n4148 diode has a forward drop of about 0.6 volts, a schottky Bat54s a drop of 0.2 volts. So errors get beyond 10% if below 6v peak for the 1n4148, or (6/1.414)*(6/1.414)/50 = 0.35 Watts. And errors get beyond 10% if below 2v peak for a Bat54s, or (2/1.414)*(2/1.414)/50 = 0.04 Watts. Taking that diode drop into account, the Bat54s can give useful results to well under a milliwatt. If you want an SWR meter that also shows power, consider Diz's $12 Tandem Match kit: ? ?? Item 18:?? If you want a full antenna analyzer, consider the nanoVNA and it's newer variants, as cheap as $40: ? ??/g/nanovna-users/messages?expanded=1 A steep learning curve, but very powerful. Jerry, KE7ER On Thu, Jan 9, 2020 at 01:50 PM, Alex Netherton wrote:
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Re: #v5 Audio, Ground?
#v5
Sounds like your speaker is grounded to the chassis on one terminal and your new configuration requires the other side to be grounded or no ground at all but two separate leads.
Mo On 01/09/20 7:34:02 PM, "Andy_501" <andrew.webb.501.ve4per@...> wrote: Maybe try nylon screws andstandoffs
via my shoephone
Sent from
On Jan 9, 2020, at 17:42, Armando Escalante <escalantea@...> wrote:
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Re: Need to Calibrate the V6
#v6
Oooops!? Correction: obviously the BFO and Freq adjustment numbers are stored.? What I should have said was could they be pulled back in and displayed like the other values that are stored in EEPROM.? As far as I can tell they aren't right now or, if they are, the knob is so twitchy that they get changed before my palsied fingers can let go of the knob ...
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Re: #v5 Audio, Ground?
#v5
Andy_501
Maybe try nylon screws andstandoffs
via my shoephone
Sent from
On Jan 9, 2020, at 17:42, Armando Escalante <escalantea@...> wrote:
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Re: New uBITX Ver. 6 Assembled Today
just to throw my own experience in here, I was suspecting the mic was bad too, but I also didn't have a proper low power meter. This morning I found an old power meter with a 10W range and tested again. No power out on SSB. I also find the mic I used with my version 3, and I see about 4 Watts out with a hearty Hallooooo! Into the mic.? I'll take it apart this weekend and see what's up, but I also have 2 of the Pacific Antenna qrpkits mics to assemble and I hear good things about those.? I'll report back.? Sent from my Burroughs B7700 - Neil Goldstein, W2NDG |
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#v5 Audio, Ground?
#v5
Odd situation. ? |
Mick
Bob Bennett
Neil Goldstein
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