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Re: Harmonics and Relay Replacement
Mark McNabb
I would really like to try out Allisons solution with the complete rearrangement of the filters. However I am a big fan of "clean" solutions,Ah Sascha, Looks aren't everything eh?? You would be happier with the supermodel that has an awful personality? The work need not look bad at all -- it's all up to how you do it and it gives one the chance to show their construction skills beyond the paint-by-numbers stage.? In the end it can be an accomplishment to be proud of! And I'm not sure if the off-board solution works the same as Allison's plan?? Hers also reduces the number of relays engaged and that need switching so CW and PTT operation would be smoother. 73, Mark. PS:? Only read Crime and Punishment from Dostoevsky -- really dramatic and emotional.? Always thought the TV detective Colombo was modeled after the police detective in that book.? And Quiet Flows the Don was a very good read also.? |
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Re: Harmonics and Relay Replacement
Joe Puma
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On Oct 19, 2018, at 5:45 PM, Arv Evans <arvid.evans@...> wrote:
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Re: Harmonics and Relay Replacement
Joe Puma
¿ªÔÆÌåÓýI¡¯m surprised someone hasn¡¯t fabricated a board that the relays and coils can be moved to and the board can be mounted on top of the ubitx with standoff¡¯s and then wired up to Ubitx.?Joe On Oct 19, 2018, at 5:17 PM, Gordon Gibby <ggibby@...> wrote:
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Re: CW decoder final
¿ªÔÆÌåÓýWhat¡¯s the price of the CW reader? ? David A Posthuma, WD8PUO 1 (616) 283-7703 ? From: [email protected] <[email protected]> On Behalf Of Johan Holstein ? Hi all, |
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Re: Tx Holy Smokes
#ubitx-help
Solved - I had PTT and ground reversed on my microphone, and then I had wrong pins when I tried to PTT with a piece of wire.? all seems okay now, yes I did align the PA bias as instructed after my effort.
73 Curt |
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Re: Harmonics and Relay Replacement
Problem, and solutions are not that simple.? Allison has added comments to the Wiki that describe both problems and solutions.? Kees has made a daughter board available for the relays and LPF components.? Overdriving the audio apparently is a big contributer to some problems.? Stage gain arrangement is another potential issue.? Board layout and component placement has been identified as problematic.? There are ways to operate the uBITX that mostly keep it within reasonable limits, but some apparently want to exceed those parameters. Unfortunately those who have recently joined the group may not have followed the process that has led up to present state of things.? Arv _._ On Fri, Oct 19, 2018 at 3:12 PM Sascha Bohnet | DL5SMB via Groups.Io <saschabohnet=[email protected]> wrote: I would really like to try out Allisons solution with the complete rearrangement of the filters. However I am a big fan of "clean" solutions, |
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Re: Harmonics and Relay Replacement
Gordon Gibby
¿ªÔÆÌåÓý?Well.......you can do all that, and I'm sure that Allison's solutions would work quite well!? ??
however, that is an AWFUL LOT of work, which is why I came up with a pcb daughterboard to just add right hand side relays and move just a FEW traces to wires heading outbound.? ?This had a very salutory effect, in almost every case dramatically reducing
the harmonics.? ?
It is possible that there are other intermediate steps that might also solve the problem.? ?But Allison has already put a HUGE amount of effort into this and I doubt she is going to do any more ---- her suggestions for the current board would solve many
of its probems;, and her contirubtions to a different company's power amplifier have provided a road map to a better power amplifier solution.? ??
So there are likely now several solutions that work and you can just take your pick of how much work you wish to do in order to improve things.? ?
Cheers,
gordon
From: [email protected] <[email protected]> on behalf of Sascha Bohnet | DL5SMB via Groups.Io <saschabohnet@...>
Sent: Friday, October 19, 2018 5:12 PM To: [email protected] Subject: Re: [BITX20] Harmonics and Relay Replacement ?
I would really like to try out Allisons solution with the complete rearrangement of the filters. However I am a big fan of "clean" solutions,
and all this wiring, cutting etc. looks really sloppy to me. And I would really hate it, if it did not work out as it should and then i would have completly ruined my board. Is maybe anyone good at pcb designing? Then we could make a daughterboard, desolder the whole filter part on the main board and put everything on the daughterboard on top. Maybe the placing of all the parts could remain the same on the additional board and only the traces would need some rearranging. |
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Re: Harmonics and Relay Replacement
I would really like to try out Allisons solution with the complete rearrangement of the filters. However I am a big fan of "clean" solutions,
and all this wiring, cutting etc. looks really sloppy to me. And I would really hate it, if it did not work out as it should and then i would have completly ruined my board. Is maybe anyone good at pcb designing? Then we could make a daughterboard, desolder the whole filter part on the main board and put everything on the daughterboard on top. Maybe the placing of all the parts could remain the same on the additional board and only the traces would need some rearranging. |
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display problem with KD8CEC firmware
Aldo Ciampaglia
Good evening
i have a problem with update KD8CEC. After installing this update the original display 1602P doesn't turn on. I used the instructions of? guide but I can't understand where is the problem. I tried with the original arduino nano and with a compatible version but the results are the same. can anyone help me ? Thank You? ? ? IZ0TKC |
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Re: Tx Holy Smokes
#ubitx-help
Doug
thanks for reply.? i checked -- i have 4.7k between pins 2 and 3 when measured at the raduino (that connector that's mounted near top of display.? I am using the uBITX box from Sunil, so it has a preassembled digital bundle cable from raduino to the uBITX -- i have display etc so its not backwards I think.? I will continue to look for an error in my work, but it takes PTT being grounded for rig to go bananas.? Curt |
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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. |
David Posthuma
YO8UFO
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