Re: ND6T AGC and Click kit wiring notes
Nick,
Hi, any eta on the AGC kits?? Just finished the V3 ubitx: it needs AGC or I will need new ears.?
Thanks.
Eddie
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Re: Harmonic performance - SSB vs CW
Thanks Tim.
I will Implement the diode switching to reduce IO ports required... or even go i2c bus? hmm...
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Re: Harmonic performance - SSB vs CW
That last message on the Japanese LPF board? was supposed to be Just to Nick but I stuffed up...
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Re: Harmonic performance - SSB vs CW
ps The PCB includes C/O relay and attenuator relays.
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Re: Harmonic performance - SSB vs CW
Overkill maybe, I have a 3 band version PCB of the G4TZR version used in Picastar, rated 100+ watts.?? Made for a personal HF rig project where 3 bands is all i need although the board can be stacked for 6 bands.? Schematic is on G6ALU's web pages, but cut down for 3 bands.? Layout identical. glenn vk3pe  
On Tue, Aug 7, 2018 at 11:31 AM, Gordon Gibby wrote:
Sure seems like it would be fairly simple and inexpensive, to make a small additional board to which you would route the transmitter signal, and relay ?control voltages, buffered if necessary ¡ª-as Nik is working on.?
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With the relays at opposite ends, even in expensive one should work. ?
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Reuse ?as many components as reasonable from the existing filters. ? The inductors at least!
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Fairly simple upgrade! ?If someone builds it , I¡¯ll buy several boards, if not, I¡¯ll lay out my own! You guys are busy explaining exactly how it needs to be done! ?And I mainly care for just a few bands?
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Cheers
Gordon
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On Aug 6, 2018, at 20:35, ajparent1/KB1GMX < kb1gmx@...> wrote:
Nick,
Best layout is similar,? Bus down one site to the NO contacts
and the wiper is the end of the filter and when in the off poistion the
wiper sits on the NC contacts to ground shorting the filter.? So a filter pick?
enables the relay and filter and no pick the filter is shorted.? Reduces
the effects of stray capacitance.
That and copper pour under everything and opposing side. lots of vias to?
tie them together especially along signal tracks.
Allison
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Re: Harmonic performance - SSB vs CW
Nick have a look at the "Jap"? 5 bands with three outputs and diode OR LPF suggestion that I just posted before you go too much further.. just a heads up.? THe design needs rework for lower power ,? but it is not too bad.? It can be just std double Pi design without all the magic bypass cappies - there must be books that cover that but I don't have one.
Remember too that a BPF board looks as if? required to cut right into the cct . thought it may be with a well designed LPF board that latter may be dispensed with.? That may affect your layout to produce a one size suits all.
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Re: Harmonic performance - SSB vs CW
On the subject of adding BPFs in place of the 30MHz LPF between T2 and the PA, has anyone considered using M0NKA's mcHF transceiver's solution for BPFs using multiplexer I/Cs?? The IC's are pretty cheap, only 48 cents in quantities of 10.
His schematics can be downloaded here:?.? The first page of the RF schematics shows the BPF and multiplexers.
Not sure what kind of impedance matching would be required to use these, but thought I'd mention it.
73,
Carl, K0MWC
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Re: Harmonic performance - SSB vs CW
Proposed filter switching fr the rework.
BEfore everyone rushes off into filter relay config as in electrical this one can do 80m,? 40 (10 with changes) and 20-30m. And all on three outputs because of the cunning diode "Or.? Moreover it shorts the unused filter to GND (except for the 20-30 one) as per AJP suggestions . This of course is a LPF design and the power level at 50W and therefore input Z is not correct for uBit X use.??
Not beyond the wit of man /or women ! to fix that. What is really cunning is that the design is zero load when used on the 20m daylight service,? ie out and about on a battery.? "It's got a Cop motor before unleaded so it runs good on regular gas ....".? Perhaps worthy of consideration though all the relay select firmware has to change.? You lose 15 m tx but still need only three o/p as before . what the heck...I kept this on file for a rainy day.? ?Allison .. am I forgiven..? please. No metric fishing...from now on.
Personally I dislike the the idea of zero means a valid state from an electrical Pof View.. ie wire falls off . no fault occurs but a logic state changes . But on a PCB it seems acceptable.
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Re: Harmonic performance - SSB vs CW
I've used both sides of the relay to reduce contact losses. Hope this doesn't cause other capacitance issues....
73 Nick VK4PLN
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Re: Harmonic performance - SSB vs CW
Here we go: Missing copper flood still... 
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Re: Harmonic performance - SSB vs CW
Sure seems like it would be fairly simple and inexpensive, to make a small additional board to which you would route the transmitter signal, and relay ?control voltages, buffered if necessary ¡ª-as Nik is working on.?
With the relays at opposite ends, even in expensive one should work. ?
Reuse ?as many components as reasonable from the existing filters. ? The inductors at least!
Fairly simple upgrade! ?If someone builds it , I¡¯ll buy several boards, if not, I¡¯ll lay out my own! You guys are busy explaining exactly how it needs to be done! ?And I mainly care for just a few bands?
Cheers
Gordon
On Aug 6, 2018, at 20:35, ajparent1/KB1GMX < kb1gmx@...> wrote:
toggle quoted message
Show quoted text
Nick,
Best layout is similar,? Bus down one site to the NO contacts
and the wiper is the end of the filter and when in the off poistion the
wiper sits on the NC contacts to ground shorting the filter.? So a filter pick?
enables the relay and filter and no pick the filter is shorted.? Reduces
the effects of stray capacitance.
That and copper pour under everything and opposing side. lots of vias to?
tie them together especially along signal tracks.
Allison
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Re: Harmonic performance - SSB vs CW
Kees
The capacitors were new from my stock in the case of the 80 meter trial filter because I did not want to bother with pulling them from the uBitx until I was sure it was going to work. I do plan to use the on-board caps for the other three filters.
WA8TOD
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Re: BitX40 Sketch still needed....
Paul Mateer, AA9GG
Is this what you are looking for?
Arv? K7HKL
_._
Does anyone have a sketch for a stock BitX40? that has the rotary encoder mod in place on interrupt pins D2 / D3?? I'm basically looking for Ashhar's stock code that has been modified for the encoder. -- Paul Mateer, AA9GG
Elan Engineering Corp.
NAQCC 3123, SKCC 4628
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BitX40 Sketch still needed....
Does anyone have a sketch for a stock BitX40? that has the rotary encoder mod in place on interrupt pins D2 / D3?? I'm basically looking for Ashhar's stock code that has been modified for the encoder. -- Paul Mateer, AA9GG
Elan Engineering Corp.
NAQCC 3123, SKCC 4628
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Re: Harmonic performance - SSB vs CW
Nick,
Best layout is similar,? Bus down one site to the NO contacts
and the wiper is the end of the filter and when in the off poistion the
wiper sits on the NC contacts to ground shorting the filter.? So a filter pick?
enables the relay and filter and no pick the filter is shorted.? Reduces
the effects of stray capacitance.
That and copper pour under everything and opposing side. lots of vias to?
tie them together especially along signal tracks.
Allison
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Re: Raduino Clone kit from W0EB-N5IB
#ubitx
Gentlemen would you mind taking this discussion to another thread?? You are cluttering up my offering of the Raduino clone to the group members.
Thanks,
Jim
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Re: Harmonic performance - SSB vs CW
Glen I hear you, I did look on eBay the omrons can be had for $1.36 each. i think 9 of them are still a reasonable cost given the LPF components can be salvaged from the original board... Also possible allows us to have 5 LPFs... This will requir moving to I2C lcd for extra IO ports...
Cheers.
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Re: Harmonic performance - SSB vs CW
Nick, I'm more inclined to stick with the current sized DIP relays for cost reasons if I did any more on this. Even though the Omrons are probably better relays, costs add up quickly.
glenn
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Re: Harmonic performance - SSB vs CW
Hi Nick,? it's just doodling right now.? I had also been thinking about doing a whole uBITX (with mods) in modular form also.? It could get expensive though re board making unless some smarts are applied to sizes and panelisation to hit the best cost/size ratio from current China suppliers.
It's also hard to form a 'final' schematic though. One also depends on the wisdom in this group for what is good and what is not so good, re mods. to take into a design.
glenn
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On Tue, Aug 7, 2018 at 09:53 AM, Nick VK4PLN wrote:
Hi Glen.
How about using?omron g6s-2, they are 5v and just need the reverse diode, I reckon then can be switched directly buy the NANO..
and about half the size...
You beat me to it, I was about to fire up EasyEDA and slap a board together..
I am still thinking of doing an entire uBitx in modular format... For this exact reason, easy to replace a section when a major fault is identified...
Great work!
73 Nick VK4PLN
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Re: Raduino Clone kit from W0EB-N5IB
#ubitx
Hi Glenn,
As far as I know, and have used, the physical layer (e.g. hardware) is defined as an open drain / open collector.? I haven't seen the Ap note.? If you have a link you could share, I would like to review.
For bit banging with a standard digital I/O port.? You set the port as an input, set the drive state to 0.? You bit bang between input and output states.
For the case we have here, between a 3.3V and 5V device, the pull-up to 3.3V Si5351 meets/ exceeds the VIH of the 5V Nano, so all is good.
However, if you need to interface between say a 1.2V or 1.8V to a? 5V? I/O you would need to level shift......? I see how this Ap note could be going now.
I will admit, that I read you post under a fog of too many folks are destroying Nanos. I'd rather have a discussion then a fellow ham wondering why something went wrong when it worked fine yesterday.
Cheers,
Gary
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Nick VK4PP
AA9GG
Jim Sheldon