Re: 4 pin microphone cobra
Rx isnt needed as the radio receives with the n ed for any special mic connections ,? braid is common, You then have the transmit wire and the audio wire , Audio wire is normally inside the braid so as to shield it , You may need to put a capacitor in series with the audio wire to block DC .
On Sun, 20 May 2018 at 13:58, ??? ?????? <hamad.kalid@...> wrote: Hello everyone i want to ask about how can i wiring the cobra 4 pin microphone , cobra 4 pin microphone has 4 elements (TX,RX,Audio, Ground) but the ubitx has only 3 pin for mic which is Mic to ( audio) , PTT to TX , GND to ground and what about the RX ??
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I'm almost embarrassed to ask for help on this but I wasn't born knowing how to do much.? I don't do much with SMT passives and the choices are starting to look endless.? I'm in the middle of a digikey order for another project and was planning to order the inductor and capacitors for Howard's mod while I am at it.? Can somebody steer me in the right direction?? Normally I like to sort through the billions of choices but my gut keeps telling me I am going to order the wrong thing.
Also, Howard your offer to share parts is very generous and if I didn't have other parts I needed to order I would be taking you up on it.
--
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On Fri, May 18, 2018 at 12:57 pm, kj6etl wrote:
I just bought these but I can feel clicks (steps) while turning. Does this mean they send me a part that isn't an EC11?
What else do I need to search for? I prefer a North American vendor for fast shipment.
This is what I just received.
https://www.ebay.com/itm/US-Stock-5x-Rotary-Encoder-Switch-EC11-Audio-Digital-Potentiometer-Handle-20mm/371842294877?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649
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Re: testing wsjtx on linux
I was following the youtube video on . Same settings.?
On Sun, 20 May 2018, 18:29 brad martin, < emclinux@...> wrote: I have had success with the version 1.8.0 I did not know there was a 1.9 out and I can give it a go later. But what setting are you using for it and if you start via the command line does it show any errors printed when you connect?
Brad
KG5SPR
On Sun, May 20, 2018 at 6:46 AM Ashhar Farhan < farhanbox@...> wrote: I downloaded and installed the 1.9.0 rc 4 from wsjtx home site for linux (a .deb file for ubuntu), i then installed it. however, it still gives me the time out error of the previous hamlib libraries.? has anyone successfully installed the linux version with ubitx support?
- f?
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Re: Help, can't change frequencies on uBitx
Maybe too simple a thought, but make sure your key pullup resistor (4.7K) is actually connected.
73,?
Paul K2AYZ
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Re: RF power chain mods and improvements..
BS170 thats a MOSFET 60pf input capacitance adds complications and would require a
bias adjustment for every one.? Not? a good choice.? A 2n7000 is a similar device
and I have 2n6661 that I"ve used in the past at RF.??There is no plan to use mosfets
in the driver or predriver stages.? Generally the gate to drain capacitance is problematic
for stability.
I've already listed MPSH10/MMBTH10 as candidates.? I am waiting on sot and to92 from supplier.
Allison
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Re: testing wsjtx on linux
I have had success with the version 1.8.0 I did not know there was a 1.9 out and I can give it a go later. But what setting are you using for it and if you start via the command line does it show any errors printed when you connect?
Brad
KG5SPR
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On Sun, May 20, 2018 at 6:46 AM Ashhar Farhan < farhanbox@...> wrote: I downloaded and installed the 1.9.0 rc 4 from wsjtx home site for linux (a .deb file for ubuntu), i then installed it. however, it still gives me the time out error of the previous hamlib libraries.? has anyone successfully installed the linux version with ubitx support?
- f?
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Hello everyone i want to ask about how can i wiring the cobra 4 pin microphone , cobra 4 pin microphone has 4 elements (TX,RX,Audio, Ground) but the ubitx has only 3 pin for mic which is Mic to ( audio) , PTT to TX , GND to ground and what about the RX ??
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Re: pin 2 of raduino board seems to have gone to CW TX full time after boot message.
John,
One L or two it still sounds like my name.? ;)
I had noticed but could not find the earlier reports but I remember seeing them.
The usual checks like is there a short/leakage path to ground come up no.
If I put a milliamp meter in the between pin2 (raduino) and 5V it start up open
and after the init display with the version number it then goes to 25ma.? It does
not power up that way so its not an input failure.
That suggests its programmatically triggered. The analog input pc1A1 can be a
digital output if so programmed as I'm familiar with the atmega328 and arduino..
That suggest an bug in the code.
Next step is reprogram...? That will be a while as I have other things for the next week
so time will be short for working on this.? My first pass is to drop some simple code
in to run the display and check that pin.
I'll report here.
Allison
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Re: pin 2 of raduino board seems to have gone to CW TX full time after boot message.
Read the post please.? The resistor is in place and that pin requires a very hard connection to5V.
So hard its drawing 25ma!
That not it.
Allison
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Not a problem, depends on the signal level you want.
Since BITXs dont have AGC you may be better off with a level control to increase or decrease the audio drive to
your decoder/pc. You can buy a ready board on the Bay and just hook it up simply!
Raj
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At 20-05-18, you wrote: Maybe asked before? I'd like to add a fixed AF jack for FT-8. Anybody done this yet? I do have extra 2822's. Thanks!!
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I downloaded and installed the 1.9.0 rc 4 from wsjtx home site for linux (a .deb file for ubuntu), i then installed it. however, it still gives me the time out error of the previous hamlib libraries.? has anyone successfully installed the linux version with ubitx support?
- f?
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? ?Maybe asked before? I'd like to add a fixed AF jack for FT-8. Anybody done this yet? I do have extra 2822's. Thanks!!
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?Victor AL3K
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An affordable samd21 with FPGA combo. That¡¯s a lot of processing in a power efficient package. Perhaps sdr and dsp functionality?
kf5nwc
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Re: Low Power Output for Hendricks BitX20A - Watt meters and Scope readings do not agree....
#bitx20
Ok, ?some improvement. ?Readings are a bit more uniform.
I checked the frequency compensation of my probes and the 10x was out of adjustment, 1x was OK. ? Adjusted the frequency compensation capacitor in the 10x position and both 10x and 1x looked good. ? (In retrospect this makes sense because the compensation capacitor is part of the 10x voltage divider network.)
Now I read 54 Vpp??(7.3 W) with the 10x probe and 44.8 Vpp (5.0 W) with the 1x probe which is in nice agreement with my -20 db coupler 46.8 Vpp (5.5 W). ? The 10x and 1x still differ but are in much better agreement than before. ?My Watt meters read 5 to 6 Watts. ? I can't say why the 10x probe reads high. ?I expect the 1x probe to be low since the probe is only rated to 6 MHz in the 1x position. ? I have no feel for the frequency variation of my -20 dB coupler.
I can get 7.2 Watts out if I crank up the drive, however the output is no longer stable; even with the?Martiens mod. ? So I have turned it down below 6W. ??
Did anyone really ever get a stable 12 Watts out of the Hendricks Bitx20A?
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Re: pin 2 of raduino board seems to have gone to CW TX full time after boot message.
Sorry, I should have written Allison with two "L".
73, John
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Re: pin 2 of raduino board seems to have gone to CW TX full time after boot message.
Hello Alison,
Head scratching really since you don't even have the usual suspect wires in the connector.
It it was me I would pull the Raduino off the main board, reload the factory software (the pin is explicitly configured as an input with pull-up resistor).?
If unsuccessful I can't see anything than a short on the circuit, which you tested, or a dead Arduino analogue inputs.?
That would make number 4 in less than so many days.
By the way I am following your driver stages re-design with interest.
All the best,
73, John (VK2ETA)
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Re: Should we adopt the KD8CEC firmware?
It is interesting that an actually simple and innocent question has drawn many down into the weeds without answering a straight forward question.
Personally I got interested in the uBITX because it was such a clever design much like my Side Band Engineers SB-33 from 1961. I loved that little radio with bilateral amplifiers and use of a clever mixing scheme limiting both the number of oscillators and even crystals, while being all solid state except for driver and finals.
The uBITX answered the need to eliminate most crystals required for a Multiband transceiver with the si5351. Cool!
Secondly it was an opportunity to learn (relearn) programming that I wanted so badly to do.
Whether the original base code, Ian¡¯s or others, they are all sources of learning, and I¡¯m suspecting that the huge success of this third project has Farhan already thinking about a successor, armed with the great feedback from the community.
Delivering very functional software that can be loaded without compiling any code makes it a wonderful starting point for a stock, as delivered currently uBITX, and much more important allows the potential for Farhan to focus more on a next generation Transceiver.
I think it is obvious the that there are a handful of features or capabilities that have floated to the top of the list, and make great sense to focus on those potentials.
There is nothing taken away from the success and learning from this great community by doing so. ?We should all be excited about that potential and keep learning.
Having started using Ian¡¯s software very early on and seeing not only his passion for the project but also his attitude, openness and respect for others are examples of the very people that make this great community what it is.
Farhan do what makes sense for you to pursue your next challenge.
I like what Ian has done and regardless of what I finally end up running it is makes the uBITX an impressive little rig out the chute. So I say sure. Lets all get on with the fun of learning.
Dave WI6R
From my dumb iPhone ??
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On May 19, 2018, at 4:31 PM, K9HZ < bill@...> wrote: Who needs that?
?
Dr.?William J. Schmidt - K9HZ
?
On May 19, 2018, at 9:31 AM, Mvs Sarma via Groups.Io < mvs_sarma@...> wrote:
i suppose that we need to prevent TX enable in the Non-ham bands. while the Rx could still be useful for listening.
?
?
?
On Saturday 12 May 2018, 11:38:37 AM IST, Ashhar Farhan < farhanbox@...> wrote: ?
?
Peeps,
?
Given that Dr.Lee's software is now pretty stable from 1.06 onwards, what do you all say about using this as the 'shipped' firmware? I have some personal quirks that make me modify it for my personal use (ex: I prefere general coverage when changing the bands rather than steps to and from ham bands) but do we consider it to be usable and stable for our needs??
?
I resisted feature-ful software as the base because smaller code base makes it easier for people to get in and modify, there is space in the memory for modifications, etc.?
?
If there is a general consensus, then, we will customize it to the standard hardware, and start burning this into the next batch of ubitx.
?
Opinions, please.
?
- f
?
?
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Re: RF power chain mods and improvements..
Even a BS170 (TO92) would work as a pre driver. However perhaps MPSH10 (MMBTH10 in sot23) just sits on the uBITX board and would do well i suppose
On Sun, May 20, 2018 at 9:02 AM, ajparent1/KB1GMX <kb1gmx@...> wrote: Problem with 2sc1973 is they may be hard to get and its still a 300mhs ft.? Might as well use 2n2222a.
The Bf199 is likely better save for its 25V CE breakdown is kinda low but the 1100mhz FT would be better.
I'd not use it for the 25V breakdown spec.
RIght now I'm not pulling transistors at random.
Q90 a 2n2963A in a smt form is being tried at 19 ma I think the current is too
high and I may reduce it further to 10-15ma. It only has to produce 2mw of power
max so running more than 200mw of power is excessive. At 15ma its about 185mw
being dissipated.? Why waste power.
Q911/912:
What I think we should use for pre-driver something with a 500 to 1ghz FT, .6 w or
better per device.? ?The HFE at higher current (30-50ma) must not sag. Even at
that the stage only need produce less than 100mw (more like 70).? ?One device
is not stressed doing that.??
Q92/93/96/97:
What I think we should use for driver something with a 500 to 1ghz FT, 1 w or?
better per device.? ?The HFE at higher current (50-100ma) must not sag.
THis stage is push pull and two need to be able to push about 1 watt
and there are many that can do that as two rather than 4.? It also can run
class AB1 at about 10 to 20ma per device since its push pull.? The
device current as is with 3904s is 27ma (very high) per device on mine.
Candidates I know of but not tested are:?
MPSH10 but I have to try them.
2n2222A? its worked in the past but the FT is barely enough.
2n3553//2n3866/2n5109 are likely good for driver (2 not four).
And no, don't go out and buy them unless your experimenting on your own.? Do report
your results!? More data points may be important.
Before the CW key oddity happened? I was testing a lone (1 not wo) and the predriver
and was getting the same or more power. makes sense as we only need maybe
70 mw of power there.? Not tested enough so everyone sit down please till it is.
I have? no reason to change the IRF510s.? For 10-12W its just right.
Allison
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Re: pin 2 of raduino board seems to have gone to CW TX full time after boot message.
Allison you should check your 4.7k resistor solder connections you should be measuring 5vdc on both sides and ground. Pin 3 is the 5vdc supply and the 4.7k resistor is setting pin 2 high. Do you have the CW jack wired up. If so what is plugged into it, that could be what is drawing low enough to switch into transmit.
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On May 19, 2018, at 22:56, ajparent1/KB1GMX < kb1gmx@...> wrote: Odd issue popped up while working with the transmitter.
Radio went to CW and stayed keyed.? Tried power of and suoon as it booted it went CW and keyed.
This is odd as the blue, purple, and green wires are not even in the connector as i"m not using the key.
The 4.7K resistor is in place on the green/blue connection pair.
If I measure pin2 (blue) to ground I get .1V save for ther is no connection and it ohms open (power off).
If I connect blue to +5 it stops but the pin is pulling down 25ma!
No ESD likely strap and conductive pad in use.
If I didn't know better id swear the input self reprogrammed as an output!
I may have to do the programing dance on this before pulling the nano.
Firmware is? factory v0.20 on startup.
Any thoughts?
Allison
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Marc Jones
Vixen21
Paul Galburt - K2AYZ
Raj vu2zap
Skip Davis