Date   
Re: show your mic

bobolink
 

My mic has its own processor 

Re: show your mic

Roy Appleton
 

😱😱🤣🤣🤣


On Fri, Apr 20, 2018, 10:39 AM bobh_us <rwhinric@...> wrote:
My mic has its own processor 

Re: anybody tried softrock and hdsdr with Ubitx?

Ashhar Farhan
 

There is am article in the swedish magazine, the QTC about using the rtl-sdr with ubitx.
- f

On Thu, 19 Apr 2018, 22:20 Paul Schumacher via Groups.Io, <wnpauls=yahoo.com@groups.io> wrote:
Has anyone tried a softrock and hdsdr with Ubitx to get the spectrum and
waterfall display?  (or something similar?)

If so, can you please describe how to go about doing it?

thanks,

Paul K0ZYV

Re: UBITX QUERY

Arv Evans
 

Norm. Vk5gi

Probably no mike gain control because the audio input is designed for
approximately 45 millivolts level and the included electret microphone
puts out approximately 45 millivolts. 
Secondary reason is that it avoids possibility of cranking the gain up
too high, overdriving the balanced modulator and causing unwanted
emission products.

Arv  K7HKL
_._


On Fri, Apr 20, 2018 at 2:17 AM, marjannorm <marjannorm@...> wrote:
Daft question gang, but how come the ubitx hasn't got a mic gain control?
Norm. Vk5gi
McLaren Vale
South Australia


Re: uBITX #933/2 Finally quite satisfied with operaton #ubitx

Jim Sheldon
 

Accidentally included the same picture twice - here's the one I intended to post showing the real time clock & voltage monitor on the screen -- that V308b is a beta version of software and even though it was compiled on 04/01, it isn't an April Fool's Day joke.

Jim - W0EB

Re: show your mic

Nelson
 

I used an old Regency CB mic case, removed the old mic element, cut down a small plastic funnel to fit where the original mic element went and cut the other end of the funnel at  appoint where a Radio Shack electret mic element would just fit and hot glued the whole mess together.

On Fri, Apr 20, 2018 at 8:50 AM, Roy Appleton <twelveoclockhigh@...> wrote:
😱😱🤣🤣🤣

On Fri, Apr 20, 2018, 10:39 AM bobh_us <rwhinric@...> wrote:
My mic has its own processor 




--
I always thought the Universe was a wonderfully strange place until I studied Particle Physics - I now know the Universe is, in fact, profoundly odd in nature

Re: show your mic

Nelson
 

Sorry, I meant to show a picture of the front of the completed mic also...

On Fri, Apr 20, 2018 at 10:46 AM, Nelson <ngtdlt@...> wrote:
I used an old Regency CB mic case, removed the old mic element, cut down a small plastic funnel to fit where the original mic element went and cut the other end of the funnel at  appoint where a Radio Shack electret mic element would just fit and hot glued the whole mess together.

On Fri, Apr 20, 2018 at 8:50 AM, Roy Appleton <twelveoclockhigh@...> wrote:
😱😱🤣🤣🤣

On Fri, Apr 20, 2018, 10:39 AM bobh_us <rwhinric@...> wrote:
My mic has its own processor 




--
I always thought the Universe was a wonderfully strange place until I studied Particle Physics - I now know the Universe is, in fact, profoundly odd in nature




--
I always thought the Universe was a wonderfully strange place until I studied Particle Physics - I now know the Universe is, in fact, profoundly odd in nature

Re: Transmitter Mods

Howard Fidel
 

That is to be determined based on the performance I get. Right now, I will adjust VR1 to get 5 watts on 40 meters and go from there.

Howard

On 4/19/2018 11:41 PM, Satish Chandorkar wrote:
How you propose to control the drive to be of 5 watts on all bands for your 70 W amplifier
As the uBITX is giving much more power out put on lower bands  than on the higher bands

Satish

Virus-free. www.avast.com

On Fri, Apr 20, 2018 at 5:07 AM, Howard Fidel <sonic1@...> wrote:
Actually, I would prefer to rewind the transformer with a center tap, and eliminate the chokes, feeding the DC to the center tap.
Z for L8, L9 should be >> then the output impedance which looks like the antenna impedance for the 1:1 transformer.
I am adding a 70 watt amplifier to my uBitx, so I just need 5 watts out on all bands to drive it. I doubt I will do much more, on the transmitter, but I will have to see how the amp behaves. I may to to better equalize the output level between the bands.

Howard




On 4/19/2018 2:37 PM, Jerry Gaffke via Groups.Io wrote:
The parallel resonance helps us to a point, though an ideal inductor would generally be better.
For example, if the inductor is self resonant at 14mhz, we'd see much more power out on 20m
than we see on 10m.  I'd prefer to keep gain vs freq somewhat controlled and predicatable.

The caps are easier to add, easier to obtain, have a higher self resonance:
    https://electronics.stackexchange.com/questions/193608/self-resonance-frequency-for-mlcc-capacitor
Maybe add 220pF caps across all six of the 22 ohm emitter resistors, and forget the inductor?
Then add a variable cap somewhere around Q90 that can be tweaked to give the flattest response,
that setting may vary given your particular 2n3904 transistor characteristics. 
 
But the inductor in series with the negative feedback is a good idea.
If this can all be done with just 3 extra components and get good enough results across
the different uBitx's out there, I'm fine with that.

One other issue:
As Henning notes in post 45035, the chokes L8 and L9 are best wound on a single core:
See the discussion below figure 4 on this webpage, where he discusses how the bifiliar
approach works, though he does not discuss the individual choke solution:
    http://ludens.cl/Electron/mosfetamps/amps.html
I was seeing significantly worse results in how the uBitx final worked compared
to the WA2EBY final in my LTSpice simulation, could be due to these chokes.
    https://groups.io/g/BITX20/topic/9615903
I may have to play with that further, not obvious to me how or if the individual chokes
at L8, L9 would impact the results..

Jerry, KE7ER


On Thu, Apr 19, 2018 at 11:00 am, Jerry Gaffke wrote:
Good question.
It's a parallel resonance:  
    https://www.everythingrf.com/community/what-is-self-resonant-frequency




Re: anybody tried softrock and hdsdr with Ubitx?

Paul Schumacher
 


Thanks Ashhar,

Paul


On Friday, April 20, 2018, 11:16:38 AM CDT, Ashhar Farhan <farhanbox@...> wrote:


There is am article in the swedish magazine, the QTC about using the rtl-sdr with ubitx.
- f

On Thu, 19 Apr 2018, 22:20 Paul Schumacher via Groups.Io, <wnpauls=yahoo.com@groups.io> wrote:
Has anyone tried a softrock and hdsdr with Ubitx to get the spectrum and
waterfall display?  (or something similar?)

If so, can you please describe how to go about doing it?

thanks,

Paul K0ZYV

uBitX with CAT control and Split operation?

Rag LB-Three-RE Stein-Roar
 

Hello

I am planning to buy/build a uBitX for dxped use.

But not sure about CAT control and VFO split ??!



Best Regards,
Stein-Roar Brobakken
@LB3RE
LB3RE K3RAG
Skype: lb3re.rag

Re: show your mic

Rob Snow
 

Here is my mic housing, I printed it up to work with the supplied parts.  The element drops in to the hole, the button snaps into the side, the three posts have holes in them to wrap the wires for stress relief.  I've also got a back printed up, but I haven't put it on the live version yet.  This was the testbed print, I ended up moving the PTT up higher and to the other side because it didn't fall under any fingers in this spot.


Delivered

Doug
 

uBITX ordered Feb 26, received via DHL today.  Can't wait to begin!

Re: show your mic

Tim Gorman
 

I used an old Motorola hand mic. I just packed the electret element
with a piece of acoustic foam in front and enough behind it to hold it
place with the back on. Works fine.

tim ab0wer

On Fri, 20 Apr 2018 10:54:32 -0700
"Nelson" <ngtdlt@...> wrote:

Sorry, I meant to show a picture of the front of the completed mic
also...

On Fri, Apr 20, 2018 at 10:46 AM, Nelson <ngtdlt@...> wrote:

I used an old Regency CB mic case, removed the old mic element, cut
down a small plastic funnel to fit where the original mic element
went and cut the other end of the funnel at appoint where a Radio
Shack electret mic element would just fit and hot glued the whole
mess together.

On Fri, Apr 20, 2018 at 8:50 AM, Roy Appleton
<twelveoclockhigh@...> wrote:

😱😱🤣🤣🤣

On Fri, Apr 20, 2018, 10:39 AM bobh_us <@bobolink> wrote:

My mic has its own processor


--
I always thought the Universe was a wonderfully strange place until
I studied Particle Physics - I now know the Universe is, in fact,
profoundly odd in nature


Re: receiver overload

Tim Gorman
 

I'm sure it happens. But not consistently. You need wind and something
to create the charge like blowing dust. If the tuner is dissipating the
charge why doesn't the rig itself do it, at least with an unbalanced
feed?

tim ab0wr

On Fri, 20 Apr 2018 08:47:00 -0500
"K9HZ" <@Doc_Bill> wrote:

Unless the antenna is picking up a static charge and the antenna
tuner is acting like an impedance to ground draining that charge
off. Don't laugh, it happens.


Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ
PJ2/K9HZ

Owner - Operator
Big Signal Ranch – K9ZC
Staunton, Illinois

Owner – Operator
Villa Grand Piton – J68HZ
Soufriere, St. Lucia W.I.
Rent it: www.VillaGrandPiton.com
Like us on Facebook!

Moderator – North American QRO Group at Groups.IO.

email:  @Doc_Bill



-----Original Message-----
From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of Tim
Gorman Sent: Friday, April 20, 2018 8:42 AM
To: BITX20@groups.io
Subject: Re: [BITX20] receiver overload

Usually a tuner will increase noise, at least atmospheric noise, as
the tuner creates a match between the receiver and the antenna. A
matched antenna shouldn't "tame" the noise. If that is actually
happening then a closer look at the system might be appropriate.

tim ab0wr



On Fri, 20 Apr 2018 11:39:39 +1000
"John Sharpe" <johsharpe@...> wrote:

Hi all,

I just had a thought about new users of the uBitx and the Bitx40.

I have both of these fine rigs but with my good antenna - a ZS6BKW
<http://www.nc4fb.org/wordpress/zs6bkw-multi-band-antenna/> at 30
feet
- the receivers are swamped by noise and big signals on 40 metres.

When I tested just now a 59+ 10 signal on my IC-7300 was unreadable
on the Bitexes with the big antenna (which has a low SWR at 40
metres) because of noise. With an antenna of just 6 feet of wire in
the shack the signal was readable (but weak) on the Bitexes!

I usually use a tuner beween the antenna and the Bitexes - that
works fine to tame the noise. Also I have fitted an RF control to
the Bitx40 that helps quieten big signals.

But if you have lots of noise in the receiver and no tuner - try a
smaller antenna on receive (it will be no good for transmitting). If
that improves things maybe you need a tuner or an RF control.

73s John V2VOL



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Re: uBitX with CAT control and Split operation?

John (vk2eta)
 

Ian's software will do both.

Do a search on KD8CEC on this forum, or see www.hamskey.com.

73, John

Re: receiver overload

Jerry Gaffke
 

The stock uBitx provides a DC path to ground.
During receive, that would be K3-12,14, K1-12,14, L1,2,3,4,  and T2.

Don's AGC fix adds AC coupling, there is no DC path:
    http://www.nd6t.com/uBITX/AGC.htm
Perhaps a 1k resistor from antenna to ground is in order there.

Jerry


On Fri, Apr 20, 2018 at 02:04 pm, Tim Gorman wrote:
I'm sure it happens. But not consistently. You need wind and something
to create the charge like blowing dust. If the tuner is dissipating the
charge why doesn't the rig itself do it, at least with an unbalanced
feed?

tim ab0wr
. . .

 

On Fri, 20 Apr 2018 08:47:00 -0500
"K9HZ" <@Doc_Bill> wrote:
Unless the antenna is picking up a static charge and the antenna
tuner is acting like an impedance to ground draining that charge
off. Don't laugh, it happens.

Re: uBitX with CAT control and Split operation?

Rag LB-Three-RE Stein-Roar
 

Hello

Thanks 👍

Best Regards,
Stein-Roar Brobakken
LB3RE K3RAG 
Skype: lb3re.rag

20. apr. 2018 kl. 23:14 skrev John <vk2eta@...>:

Ian's software will do both.

Do a search on KD8CEC on this forum, or see www.hamskey.com.

73, John

Re: receiver overload

Don, ND6T
 

The principle idea of my AGC mod is built around the potentiometer RF gain control. It is meant to work in concert with it. As such, that potentiometer works as a static dissipation device to ground. My antennas here are both end-fed random wires (one 175 feet long, the far end up 100 feet) and are excellent static accumulators unless provided a path to ground. A 10 Megohm resistor will do that, by the way. I cannot overemphasize the desirability of a manual RF gain control, even with an AGC. I think most operators, even with the fanciest of rigs, use that control extensively. Best noise reduction device ever! 73, Don 

Re: Transmit indicator light.

Don, ND6T
 

In my opinion, the very best LED transmit indicator was the one that Derry Spittle (VE7QK [SK]) used in his Epiphyte QRP SSB series. That was just a 470 ohm quarter watt resistor through a small toroid and attached to a panel-mounted LED at each leg. The lead to the antenna passed through next to that resistor. That was it! When RF went to the antenna, it lit. You could easily tell if you were speaking loudly enough into the microphone, etc. Fast response, little panel space, and EASY. 73, Don

Re: receiver overload

K9HZ <bill@...>
 

That is not where you want static charges dissipating! Chokes to ground, resistors, at the antenna. All a better place for it (the fire) to happen.


Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ

Owner - Operator
Big Signal Ranch – K9ZC
Staunton, Illinois

Owner – Operator
Villa Grand Piton – J68HZ
Soufriere, St. Lucia W.I.
Rent it: www.VillaGrandPiton.com
Like us on Facebook!

Moderator – North American QRO Group at Groups.IO.

email: @Doc_Bill

-----Original Message-----
From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of Tim Gorman
Sent: Friday, April 20, 2018 4:05 PM
To: BITX20@groups.io
Subject: Re: [BITX20] receiver overload

I'm sure it happens. But not consistently. You need wind and something to create the charge like blowing dust. If the tuner is dissipating the charge why doesn't the rig itself do it, at least with an unbalanced feed?

tim ab0wr

On Fri, 20 Apr 2018 08:47:00 -0500
"K9HZ" <@Doc_Bill> wrote:

Unless the antenna is picking up a static charge and the antenna tuner
is acting like an impedance to ground draining that charge
off. Don't laugh, it happens.


Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ
PJ2/K9HZ

Owner - Operator
Big Signal Ranch – K9ZC
Staunton, Illinois

Owner – Operator
Villa Grand Piton – J68HZ
Soufriere, St. Lucia W.I.
Rent it: www.VillaGrandPiton.com
Like us on Facebook!

Moderator – North American QRO Group at Groups.IO.

email: @Doc_Bill



-----Original Message-----
From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of Tim
Gorman Sent: Friday, April 20, 2018 8:42 AM
To: BITX20@groups.io
Subject: Re: [BITX20] receiver overload

Usually a tuner will increase noise, at least atmospheric noise, as
the tuner creates a match between the receiver and the antenna. A
matched antenna shouldn't "tame" the noise. If that is actually
happening then a closer look at the system might be appropriate.

tim ab0wr



On Fri, 20 Apr 2018 11:39:39 +1000
"John Sharpe" <johsharpe@...> wrote:

Hi all,

I just had a thought about new users of the uBitx and the Bitx40.

I have both of these fine rigs but with my good antenna - a ZS6BKW
<http://www.nc4fb.org/wordpress/zs6bkw-multi-band-antenna/> at 30
feet
- the receivers are swamped by noise and big signals on 40 metres.

When I tested just now a 59+ 10 signal on my IC-7300 was unreadable
on the Bitexes with the big antenna (which has a low SWR at 40
metres) because of noise. With an antenna of just 6 feet of wire in
the shack the signal was readable (but weak) on the Bitexes!

I usually use a tuner beween the antenna and the Bitexes - that
works fine to tame the noise. Also I have fitted an RF control to
the Bitx40 that helps quieten big signals.

But if you have lots of noise in the receiver and no tuner - try a
smaller antenna on receive (it will be no good for transmitting). If
that improves things maybe you need a tuner or an RF control.

73s John V2VOL



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