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Re: Harmonics and Relay Replacement
I still havent finished Brothers Karamazov. Yes, I have read it cover to cover several times. Not yet finished. On Fri, Oct 19, 2018 at 10:33 PM ajparent1/KB1GMX <kb1gmx@...> wrote: On Thu, Oct 18, 2018 at 02:08 PM, RCBoatGuy wrote: |
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Re: uBITX microphone suggestions
Hey! You can use an old smartphone which you don't need anymore. You just install any kind of "mic to speaker" app on the phone and wire the input of uBitx to the stereo jack of the phone. It's just running perfect for me. From the volume up-volume down buttons you can adjust the "gain" to say so.? My electret microphone doesn't work at all and I don't have an another one. It just came like this.?
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Re: Harmonics and Relay Replacement
On Thu, Oct 18, 2018 at 02:08 PM, RCBoatGuy wrote:
has anyone tried shielding the relays from the PCB using copper tape between the board and relays Carl, Yes back in early july.? Didn't help much at all maybe 2db at the high end of the band. Look at the wiki pictures two of the longer lines have RF power on them and they all loop back to KT1 and past all the others.? Not good. Allison |
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Re: Harmonics and Relay Replacement
On Thu, Oct 18, 2018 at 09:07 AM, Jerry Gaffke wrote:
The board layout looks problematic, it may prove necessary to at least replace a few traces with coax?while the relays are off the board. Jerry,? Its more than looks, it is that way.? Whats in the wiki is verified work that does work. Fix the layout and it works.?? More isolation in the relays helps but doesn't fix (harmonic on 40 for example) that is because the blow by of the relays is not exceeded by the layout. Hence my comment on the G6 relays... obviously the high cost? part should be even better.? Except that layout cripples you too, its about as good as it gets.. As far as W&P, that took me a week of evenings, the Dune trilogy is a weekend read. Allison |
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Re: Harmonics and Relay Replacement
On Thu, Oct 18, 2018 at 08:27 AM, iz oos wrote:
I have been convinced too by these phony people to simply replace the relays. I suspect some of them work for either Axicom or the Farnell :) No its legit.? By lowering the leakage past the relay itself the over all attenuation is better. When I say better its in the form of just enough to help the issue and not a full solution. The word often used in industry is a a bandaid (brand of small self stick bandage). My experience and evaluation says if the layout were functional the old relays would have done the job and this discussion would be moot. Allison |
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Re: Tx Holy Smokes
#ubitx-help
Did you connect the keyer jack as shown in the wire up instructions or put a 4.7k resistor across pins 2 and 3 on the Raduino?
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Tx Holy Smokes
#ubitx-help
I have a new uBITX v4, very recent batch.? Rx is fine.? I am plugged into 2.9 amp power supply that I use with other QRP rigs, and a good antenna.?
When I push transmit -- I get continuous toggle -- nothing good.? No warmth in PA, it happens too quick to read any current.? I unplugged my mike, run a wire from PTT to ground - same behavior.? I moved all the wires around - no change.? Something seems amiss on the board -- has this seen before? Curt |
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Re: uBITX microphone suggestions
Indeed, be careful about cranking up that mike audio on the uBitx.
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Due to the gain distribution through the IF amps and into the mixers, carrier leakage and out of band spurs can rise considerably even though the signal? still sounds clean otherwise. On Fri, Oct 19, 2018 at 05:53 AM, Wayne Leake wrote:
Just be sure to adjust the mike gain so you don't overdrive the radio. |
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Re: uBITX microphone suggestions
Joe Puma
¿ªÔÆÌåÓýI did that too. Plus I added a amp/compressor board. My audio level are hitting nicely now ???Joe On Oct 19, 2018, at 4:41 AM, iz oos <and2oosiz2@...> wrote:
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Re: Simple spur fix
Nice, and continue to share your experience as you advance. all the best regards sarma ?vu3zmv On Fri, Oct 19, 2018 at 7:19 PM Warren Allgyer <allgyer@...> wrote:
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Re: Simple spur fix
Warren Allgyer
Back online after 3 weeks in Mongolia........ Not bad for 80 cents! ? WA8TOD (recently JT1TD and BG1TOD) |
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Re: uBITX microphone suggestions
?If you can get microphones made for the G.E. Delta and Rangr series, they come with a preamp built in. ?Just wire the connector of your choice onto the cable.?Some of those came with a speech processor, I think. ?been a while since I looked at those. ?I normally did not need anything besides the stock mikes. |
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Re: uBITX microphone suggestions
Art Boelke
If you do not like working on the V3 board you could add up toa 2.2k
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dropping resistor in the mic in series with + voltage line to electret element. As to low audio a little amp or compressor amp in mic would work. On 10/18/18, Ian Reeve <ian.radioworkshop@...> wrote:
I have a version 3 uBITX which came with a tiny electret capsule which has |
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Re: uBITX microphone suggestions
11v seem a lot. To have a reasonable average power in SSB I followed the advice by Howard Fidel in my vers. 3 ubitx: ' Change R63 to 24 ohms. The earlier rev boards had 100 ohms there, and V3 has 47. I put another 47 ohm resistor in parallel with the one on the board.' Il 19/ott/2018 10:31, <laurent.bury@...> ha scritto: Hello Ian, |
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Re: Harmonics and Relay Replacement
Given that the main problem is the layout, although better relays seem to help, has anyone tried shielding the relays from the PCB using copper tape between the board and relays, soldered to the relays ground pin?? I don't currently have a uBitX, or I'd give it a try. :(
You'd have to be careful to notch the copper so it doesn't short to any other relay pins, but it might help shield the relays... 73, Carl,.K0MWC |
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Re: Harmonics and Relay Replacement
Joe Puma
¿ªÔÆÌåÓýYou nailed it with the rework. I probably wouldn¡¯t go through that effort although I don¡¯t mind, but different relays that can keep the issue at bay seems like a no brainer if you don¡¯t want to roll the sleeves up or maybe don¡¯t have the skill to do so.?Joe On Oct 18, 2018, at 11:11 AM, ajparent1/KB1GMX <kb1gmx@...> wrote:
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Re: Version 4 High Pitch Audio Oscillation
#ubitx
#ubitx-help
If it's one of the ceramic resonators on the Nano, I doubt messing with the BFO will be much of a fix.
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Move the BFO more than a few hundred Hz and the rig will no longer work properly. (You could try moving the BFO to the other side of the 12mhz crystal filter, but that would require changes to the Nano's sketch) The ceramic resonators are quite unstable, as Barry's "goes higher in pitch" statement suggests. They are typically spec'd for something like +/- 100 khz, which may explain why most of us don't have the problem. When the USB port from the Nano is not connected to a host computer, the 12mhz oscillator for the USB interface on the Nano is not operating. So if it's from the Nano, it would be from the 16mhz resonator.for the processor clock. Putting a finger on the 16mhz resonator would definitely push that audio around, likely? well out of hearing.? ? If so, perhaps a small cap or two will move it over sufficiently, or just a scrap piece of grounded copper foil brought near the resonator. Easy to get at the 16mhz resonator on a v3 uBitx On a v4 uBitx, the Nano is socketed upside down on the other side of the Raduino, and the 16mhz resonator is not accessible.? Try soldering a short wire to one end or the other of the resonator, see if the audio tone varies as you bring your finger close to that wire. ? ??/g/BITX20/message/60744 Jerry, KE7ER On Thu, Oct 18, 2018 at 10:18 AM, barry halterman wrote:
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YO8UFO
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