Re: uBITX drive level..
#ubitx
Oh, yes, now I see.? I got overly excited there for a moment seeing the 10w on 20m.
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Re: Audio in speakers during Tx
Yes, it depends on
input Z of the amps.? I remember tube amps.?? I built a big
stereo in the 60's, they had Hi Z so low values worked.? I
have a great story....... My neighbors had a water heater
system with a big water holding solar panel on the roof.? When
I fired up the SB200 or 220, it cycled their water pump.? They
figured it out!?? They heard me Yelling on the Mic during a DX
Contest!? They put 2 and 2 together.
I had to go on the
roof and put .1uF? on all their control switches and wiring!??
It was a perfect 20 Ant. up there.
73's
Mike
?
On 2/7/2018 8:44 AM, Mvs Sarma wrote:
Mice,
?I had these experiences that old? Inveterted audio
electronic telephones instruments called secraphones
installed for VIPs? close to Radio Transmitters? used
to misbehave.
?We immediately used to have a capacitor across the Mic
module and telephone line Inop=put close to active
components to byepass RF.
?You are right that even 1000pF would do.
?But afterall the audio at Volumen control point is coupled
with 1 to 5uF capacitors.
?hence i thought even 0.1uF would not deteriorate audio.? The
induction could be internal to amplispeaker also and thro
power mine that powers the ampli speakers.
?Thu8s? I suppose that byepaasing audio at volume cotroll
stage is better.
?regards
?sarma
?vu3zmv
??
--
Mike Hagen, WA6ISP
10917 Bryant Street
Yucaipa, Ca. 92399
(909) 918-0058
PayPal ID "MotDog@..."
Mike@...
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Re: uBITX drive level..
#ubitx
Rob, This is a change to the mic amp.??It will not fix the low power issue with the PA.?
Marco - KG5PRT?
On Feb 7, 2018 10:34 AM, "Rob Snow" < rsnow@...> wrote: Thank you for the information.? Just to be clear, the changes from Mr. Kang have fixed your PA drive level with using the IRF510s?? No other changes?? Have you checked on 10m?
-Rob
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Re: Audio in speakers during Tx
Mice,
?I had these experiences that old? Inveterted audio electronic telephones instruments called secraphones installed for VIPs? close to Radio Transmitters? used to misbehave. ?We immediately used to have a capacitor across the Mic module and telephone line Inop=put close to active components to byepass RF. ?You are right that even 1000pF would do. ?But afterall the audio at Volumen control point is coupled with 1 to 5uF capacitors. ?hence i thought even 0.1uF would not deteriorate audio.? The induction could be internal to amplispeaker also and thro power mine that powers the ampli speakers. ?Thu8s? I suppose that byepaasing audio at volume cotroll stage is better.
?regards
?sarma
?vu3zmv
??
On Wed, Feb 7, 2018 at 8:53 PM, Michael Hagen <motdog@...> wrote:
Might try looping lead
(leads?) to amp thru a ferrite, or get the split clamp on
ones, close to were it goes in the amp?
Wrap up in a coil any
extra length of the cable.? Makes a common mode choke.
As Sarma says, maybe a
100 - 1000 pF bypass on each input?
73's
Mike, WA6ISP
On 2/7/2018 6:45 AM, Mvs Sarma wrote:
i imagine that Prabha jee
?Pleace a 01.1uF capacitor on ech channel, at the middle
pin of Violume control to ground. It would byepass the
RF induced in the speaker connecting cable.
? Aduio would disappear.
All the best
?sarma
?vu3zmv
--
Mike Hagen, WA6ISP
10917 Bryant Street
Yucaipa, Ca. 92399
(909) 918-0058
PayPal ID "MotDog@..."
Mike@...
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Re: uBITX drive level..
#ubitx
Thank you for the information.? Just to be clear, the changes from Mr. Kang have fixed your PA drive level with using the IRF510s?? No other changes?? Have you checked on 10m?
-Rob
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Re: uBITX drive level..
#ubitx
Hi,
I can confirm that the above fix (Mr. Kang) works :-)
Yesterday i changed the value of R65 to 4K7 and the value of R63 to 10 Ohm.
I used 1206 components (desolderd from scrap prints).
I now have, on normal voice volume, 10 watt's out on 20m.
RV1 is turned counter clockwise for about 75%.
I use a Baofeng microphone.
73 's André PA3EIV
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Re: Audio in speakers during Tx
Might try looping lead
(leads?) to amp thru a ferrite, or get the split clamp on
ones, close to were it goes in the amp?
Wrap up in a coil any
extra length of the cable.? Makes a common mode choke.
As Sarma says, maybe a
100 - 1000 pF bypass on each input?
73's
Mike, WA6ISP
On 2/7/2018 6:45 AM, Mvs Sarma wrote:
i imagine that Prabha jee
?Pleace a 01.1uF capacitor on ech channel, at the middle
pin of Violume control to ground. It would byepass the
RF induced in the speaker connecting cable.
? Aduio would disappear.
All the best
?sarma
?vu3zmv
--
Mike Hagen, WA6ISP
10917 Bryant Street
Yucaipa, Ca. 92399
(909) 918-0058
PayPal ID "MotDog@..."
Mike@...
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Re: W0EB/W2CTX Latest uBITX software release
#ubitx
Thank you Release New Version.
CW keying on MIC PTT is nice.(Impliments mine onto Ver.1)
I'm modified TX HAM BAND ONLY to function:void Check_Transmit(void).
It's need Japan Radio reguration.
and... Reg.1/2 must 40m BAND limits below 7200kHz,change BAND DATA.
de JE4SMQ masa
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Re: Audio in speakers during Tx
i imagine that Prabha jee
?Pleace a 01.1uF capacitor on ech channel, at the middle pin of Violume control to ground. It would byepass the RF induced in the speaker connecting cable. ? Aduio would disappear. All the best ?sarma ?vu3zmv
On Wed, Feb 7, 2018 at 7:00 PM, Praba Karan <vu3dxr@...> wrote: external amplispeaker...
i heard audio even volume down bottom.
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CAT Support uBITX Firmware CEC Version 1.0 Release
#ubitx
all I wanted to do a simple hardware modification, so I early to finished firmware develop. also almost no space left for the programming, I am going to work on fixing bugs. This version of the concept is an upgrade without hardware modifications. No hardware modifications are required to use this firmware. 
1.Cat communication support. (fldigi, wsjtx, hamradio delux, rpi... more)
2.New Frequency Tune method (threshold applied)
3.Ham band applied (can change general mode)
? ?(you can select region and adjust ham band by uBITX Manager)
4.CW Keying Change (Ron's code)
5.Key ADC Range adjust by uBITX Manager
6.Split (just VFOA/VOFB)
7.Channel Memory (20 Channels, 10 Channel has Tag (Name) by uBITX Manager)
8.TX Control (Many countries are imposing sanctions on transmittable frequencies.)
? ?This feature allows uBITX to be used in most countries.
9.Dual VFO Dial lock
10.IF Shift
11.Built in memory keyer (Auto key, CW Text input by uBITX Manager)
? ??I put a lot of funny features but I could not introduce them.
? ??For example, Hold during automatic transmission, and the ability to transmit manually and automatically transmit again.
? ??The ability to select and schedule other text by turning the dial during automatic transmission. more...
? ?
12.CW Mode (Just set the BFO for CW)
and more...
If you are interested, please refer to the link below.?I posted a brief introduction and installation instructions.
There is always a source in the github repository that I am working on.
Most of the features are easy to use, but we'll post them on our blogs and youtube for features that require clarification.
Farhan, who made a very good transceiver, software and playground, and Ron, who improved cw keying, And my best thanks are those who have provided advice, tests and ideas.
(Perhaps somebody is still looking for a bug in the firmware or a feature to add.)
I am going to do some interesting hardware modifications.?I'll have to buy a resistor to add a switch.
i will introduce another version that comes with hardware modifications.
--?
Best 73 KD8CEC / Ph.D ian lee kd8cec@...
(my blog)
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160m doublet feed with 450 ohm line.
toggle quoted message
Show quoted text
On Feb 6, 2018, at 9:23 PM, Vince Vielhaber <vev@...> wrote:
What are you using for an antenna?
Vince.
On 02/06/2018 08:06 PM, bill richardson wrote:
Turned the output down to about 8 Watts and have made 4 contacts on 160 with great reports. Will add a larger heat sink to be safe.
On Feb 6, 2018, at 7:26 PM, bill richardson <ng1p.bill@...> wrote:
I don’t have a spectrum analyzer but I think your right. Without the LPF installed I’m seeing over 20 Watts out on 160m and with it I see 12watts out so a lot of signal outside of the 160m band is happening...
On Feb 6, 2018, at 7:12 PM, John Backo <jabac@...> wrote:
Bill:
I think what you are seeing is the "normal" variation in the
output of the MOSFETS. Some are better than others at RF.
Gordon's suggestion to turn back the drive is probably the right answer.
Alternatively, you could turn down the gate voltage a bit, but that
would probably introduce compression distortion. Or you could increase
the size of the heat-sink and see how it goes. Probably the wisest thing
to do is both turn back the drive a bit and increase the heat-sink.
Some, but not all, IRF510's are capable of 20W or more on 80m.
you might happen to have some good ones. The key lies in the
harmonic generation and the heat-sinking.
Note that what you are seeing MAY be from UHF oscillation included in
the signal. Be very aware of that. Check your output very carefully.
john
AD5YE
--
Michigan VHF Corp.
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Re: Audio in speakers during Tx
This issue is from microbitx
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Audio in speakers during Tx
I am using external speakers. During Tx, it picks transmitted audio.
Any remedies ?
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Hey all thought I would post a new element I have been playing with,? had some good audio reports with this one after some testing I have decided to keep it.
--
David
?N8DAH
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Hi Everybody,
I just uploaded a file which describes a hardware and software modification to the uBITX to interface a resistive keypad.? See kb1oiq_ubitx_keypad.pdf if interested.
Enjoy!
Thanks, and 73,
Andy
KB1OIQ
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What are you using for an antenna?
Vince.
toggle quoted message
Show quoted text
On 02/06/2018 08:06 PM, bill richardson wrote: Turned the output down to about 8 Watts and have made 4 contacts on 160 with great reports. Will add a larger heat sink to be safe.
On Feb 6, 2018, at 7:26 PM, bill richardson <ng1p.bill@...> wrote:
I don’t have a spectrum analyzer but I think your right. Without the LPF installed I’m seeing over 20 Watts out on 160m and with it I see 12watts out so a lot of signal outside of the 160m band is happening...
On Feb 6, 2018, at 7:12 PM, John Backo <jabac@...> wrote:
Bill:
I think what you are seeing is the "normal" variation in the
output of the MOSFETS. Some are better than others at RF.
Gordon's suggestion to turn back the drive is probably the right answer.
Alternatively, you could turn down the gate voltage a bit, but that
would probably introduce compression distortion. Or you could increase
the size of the heat-sink and see how it goes. Probably the wisest thing
to do is both turn back the drive a bit and increase the heat-sink.
Some, but not all, IRF510's are capable of 20W or more on 80m.
you might happen to have some good ones. The key lies in the
harmonic generation and the heat-sinking.
Note that what you are seeing MAY be from UHF oscillation included in
the signal. Be very aware of that. Check your output very carefully.
john
AD5YE
--
Michigan VHF Corp.
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Re: uBITX Firmware (CEC) 0.30 released (Test version).
#ubitx
David
Thanks for very important information. that is my mistake. i plan release version 1.0 from version 0.35 with fixed it.
Thanks again, David.
Ian KD8CEC
Ian
Now on version 0.35, another great increase in flexibility, thanks, I been trying the memory function, storing the FT8 frequencies, a small wrinkle, whilst the correct frequency is recovered from memory the stored sideband is not.? If USB iis set from the memory manager LSB is always restored, if the memory is set from the rig USB is only restored for frequencies above 10 MHz..
best regards
David S
G8DJM
-- Best 73 KD8CEC / Ph.D ian lee kd8cec@...
(my blog)
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Andre Berwald PA3EIV
N8DAH