Anyone tried to reduce the drive at Q20 and Q40 ? to keep from overdriving the poor ol' 12MHz and 45MHz filters in Tx mode. I think Allison suggested replacing R43 and maybe R23 with a 1N4007 diode (only 1N400x diode which has an extra layer and
mimics a PIN diode).?
If I didn't have my uBITX all torn apart for filter experiments, I would try that. Still a heck of a nice unit with that Nextion display.
73 Kees K5BCQ
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I tried the suggestion someone mentioned (changing 10K for 8.2K) with same result (no change).
Then I found this diagram, as you can see, the Key? and Paddle have separate plugs and wiring, I will try this next...
?
I will let you know if it works.
73's
A
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Re: UBITX V3 TX GAIN VARIATIONS
On Wednesday, August 29, 2018, 10:11:57 AM PDT, ajparent1/KB1GMX <kb1gmx@...> wrote:
Jim, Try this input to q90 Isolate the other stuff from loading the input to the amp, output at T11 before the filters (cut trace).?? Doing that requires tracking generator but yyou can sweep it by hand? using a any RF generator (measure direct then measure through). Run that at 3db/division to see the droop is power and gain.? When I've done that on many samples they all sag about 10-12db from 3-30mhz.? Its not the IRF510 its all in the stages before it.? The IRF510 can be flat but in that design it also sags about 2-3db because, long leads, transformers not optimum, board layout. Allison
_._,_._,_
Re-posting sweep from L1 to T10 ...I think the culprit is the L1-L4 lowpass ...The values don't match any of the "on-line calculators I've tried ...Tomorrow bread-board one and see
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All
Please understand that LPF will only be effective to bring CW into compliance. SSB compliance will require BPF for 17 through 10 meters.?
Then you have IMD to deal with ......... ?
WA8TOD
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On Wednesday, August 29, 2018, 9:30:26 AM PDT, Brent Seres <brentseres1@...> wrote:
So if I buy LPFs from Hans, which bands would you recommend? Given that the even harmonics are fairly well attenuated, I'm assuming I could use 1 LPF for 2 bands (ie 40/ 30, 20/17)?? Given the current solar flux disaster,? I probably have several years to solve 15, 12 and 10. Alternately, the BPFs for each band.? I'm not ready to give up yet!
_._,_._,_
You get rid of the even harmonics by adjusting rv2/rv3 until they (the even harmonics) null out ...same on every push-pull amp
Jim
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Did you find a cure??? I have tried most everything including resistor values, a new front panel board by Sunil, connectivity, etc.? No progress.
Like you, the Di side works but that's all.
Help??
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Re: compiling ubitx ver 4.3
Right.? And this from the hobby group that routinely builds test gear that is essentially a ball of electrical tape¡? Jack is a professional and acts that way.? I just barely produce code that works¡ if at all. ? ?
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From: [email protected] [mailto:[email protected]] On Behalf Of W2CTX
Sent: Wednesday, August 29, 2018 3:40 PM
To: [email protected]
Subject: Re: [BITX20] compiling ubitx ver 4.3? I extremely disagree!? As a hobbyist we have NO schedules and NO budget constraints! ? There is no reason not to produce clean code.? It's called being LAZY. ? There are a lot of people that look at our code and try to learn from it.? Jack has written many posts about proper coding which most people just ignore. ? rOn
On August 29, 2018 at 3:08 PM MadRadioModder <madradiomodder@...> wrote: No disrespect intended, but you do get paid for what you do.? This is a hobby, so in the words of Clint E. ¡°Go ahead, fix my code¡¡±.? ? ? From: [email protected] [mailto:[email protected]] On Behalf Of Kevin Timm
Sent: Wednesday, August 29, 2018 1:31 PM
To: [email protected]
Subject: Re: [BITX20] compiling ubitx ver 4.3 ? As a professional software developer I'm required to deliver code that has no errors and no warnings.? I don't understand why people don't hold themselves to the same standard when releasing software for hobbyist use.? And please don't tell me that it's not worth the time, my response to that is that is indeed worth the time because of the questions it raises when people try to use your code.
73
K5KDT
Kevin
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¡_. _._
?
-- ¡_. _._
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Mike,
how did you determine it was Q90 for certain?
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72 and God bless
KD4EPG
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The QRP Labs website says? ?"The Low Pass Filter kit can handle at least 10W safely"
73 Kees K5BCQ.
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On the Site it says ' The Low Pass Filter kit can handle at least 10W safely' so it will.
Il 29/ago/2018 22:46, "iz oos" < and2oosiz2@...> ha scritto: Ask Hans, if not ask the right capacitors that handle that power.
Il 29/ago/2018 22:33, "Guy N7BIR" < sgbridge@...> ha scritto:
>
> Joe,
> Not sure that the QRPLabs¡¯ LPFs will handle the uBitX power capabilities.?
>
> Guy WB7SZI
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Ask Hans, if not ask the right capacitors that handle that power.
Il 29/ago/2018 22:33, "Guy N7BIR" < sgbridge@...> ha scritto:
>
> Joe,
> Not sure that the QRPLabs¡¯ LPFs will handle the uBitX power capabilities.?
>
> Guy WB7SZI
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Re: compiling ubitx ver 4.3
I extremely disagree!? As a hobbyist we have NO schedules and NO budget constraints!
There is no reason not to produce clean code.? It's called being LAZY.
There are a lot of people that look at our code and try to learn from it.? Jack has written many posts
about proper coding which most people just ignore.
rOn
On August 29, 2018 at 3:08 PM MadRadioModder <madradiomodder@...> wrote:
No disrespect intended, but you do get paid for what you do.? This is a hobby, so in the words of Clint E. ¡°Go ahead, fix my code¡¡±.? ? ? From: [email protected] [mailto:[email protected]] On Behalf Of Kevin Timm
Sent: Wednesday, August 29, 2018 1:31 PM
To: [email protected]
Subject: Re: [BITX20] compiling ubitx ver 4.3 ? As a professional software developer I'm required to deliver code that has no errors and no warnings.? I don't understand why people don't hold themselves to the same standard when releasing software for hobbyist use.? And please don't tell me that it's not worth the time, my response to that is that is indeed worth the time because of the questions it raises when people try to use your code.
73
K5KDT
Kevin ?
--
¡_. _._
?
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Joe,
Not sure that the QRPLabs¡¯ LPFs will handle the uBitX power capabilities.?
Guy WB7SZI
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MRM,
Depends on how the testing turns out ;o)
Haven't decided yet. Anyone can order boards with the Gerbers and share with friends using the "$2 for 10 boards + postage" deals several board vendors have. I uploaded what the artwork looks like to the "Files" section under my call. The 4x version is specifically designed to work with the existing uBITX and use it's LPF parts. Feel free to ask questions?
73 Kees K5BCQ ....charging another windmill.
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On Fri, Aug 24, 2018 at 08:08 AM, jim wrote:
Cap not so much, diode however needs to have a low voltage conductivity for sensitivity
Germanium diodes have a Vf of around 0,2 volts ..Silicon (1N4148) around 0.7 volts ...Schottkey around 0.3 volts
The 1n34a is a germanium point contact type ...A lot of the ebay "germanium" diodes are really schottkeys
I built the probe per N5ESE's website and it worked. I was able to trace RF during TX to C80, but nothing at C84. Turned out there was no continuity between the relay K1 pin 1 and R84 on TX.? I fixed that, and now there's RF energy getting to the antenna connection and the IRF510s are generating heat when they are supposed to. However, nothing is showing up on WSPRnet or PSK Reporter, so there's some more work to do. Thanks to everyone who helped me get this far!
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You gonna bake a batch of boards or is this left to the reader? ? ?
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From: [email protected] [mailto:[email protected]] On Behalf Of Kees T
Sent: Wednesday, August 29, 2018 3:08 PM
To: [email protected]
Subject: Re: [BITX20] uBitx Unfiltered ? I have Gerbers for 2 different LPF relay boards. Both support the Hans Summers plug-in QRP Labs LPFs. One has space for 4x LPFs like the existing uBITX LPFs and uses smaller Omron DPDT relays and the other has space for up to 6 LPFs and uses the "standard" DPDT relays which uBITX uses. The 4x board has a diode dot OR which makes it compatible with 3 existing Raduino control signals. The 6x board has 6 individual control lines which could be a 6x rotary switch or some type of decoder/driver which could interface to the 3 Raduino control bits (would require a code change for proper LPF selection).
Presently undergoing testing but the Gerbers will be made available.?
73 Kees K5BCQ -- ¡_. _._
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I have Gerbers for 2 different LPF relay boards. Both support the Hans Summers plug-in QRP Labs LPFs. One has space for 4x LPFs like the existing uBITX LPFs and uses smaller Omron DPDT relays and the other has space for up to 6 LPFs and uses the "standard" DPDT relays which uBITX uses. The 4x board has a diode dot OR which makes it compatible with 3 existing Raduino control signals. The 6x board has 6 individual control lines which could be a 6x rotary switch or some type of decoder/driver which could interface to the 3 Raduino control bits (would require a code change for proper LPF selection).
Presently undergoing testing but the Gerbers will be made available.?
73 Kees K5BCQ
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Re: compiling ubitx ver 4.3
Perhaps I'm just old and in the way, but this "char literal to char" warning seems a bit much,
If the compiler saw where I was later assigning a different value to that char, then it can complain
And I would not.
If you want zero warnings when especially fastidious checking is turned on,
you might be re-writing a bunch of libraries.
Jerry
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On Wed, Aug 29, 2018 at 10:43 AM, <terryhugheskirkcudbright@...> wrote:
the warnings seem to be about conversions fro char literal to char
is thsi a problem
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MadRadioModder
Arvo W0VRA