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?
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Re: uBitX with CAT control and Split operation?
Hello
Thanks ? Best Regards, LB3RE K3RAG? Skype: lb3re.rag
toggle quoted message
Show quoted text
Ian's software will do both.
Do a search on KD8CEC on this forum, or?see?.
73, John
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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:
? ??
Perhaps a 1k resistor from antenna to ground is in order there.
Jerry
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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.
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Re: uBitX with CAT control and Split operation?
Ian's software will do both.
Do a search on KD8CEC on this forum, or?see?.
73, John
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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" <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 ¨C K9ZC
Staunton, Illinois
Owner ¨C Operator
Villa Grand Piton ¨C J68HZ
Soufriere, St. Lucia W.I.
Rent it: www.VillaGrandPiton.com
Like us on Facebook!
Moderator ¨C North American QRO Group at Groups.IO.
email:? bill@...
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Tim
Gorman Sent: Friday, April 20, 2018 8:42 AM
To: [email protected]
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
<> 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
---
This email has been checked for viruses by AVG.
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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 <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
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uBITX ordered Feb 26, received via DHL today.? Can't wait to begin!
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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. 
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uBitX with CAT control and Split operation?
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
post@...
LB3RE K3RAG
Skype: lb3re.rag
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Re: anybody tried softrock and hdsdr with Ubitx?
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= [email protected]> 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?
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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:
toggle quoted message
Show quoted text
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
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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.
-- 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 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: uBITX #933/2 Finally quite satisfied with operaton
#ubitx
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 
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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
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Re: anybody tried softrock and hdsdr with Ubitx?
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= [email protected]> 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?
|
|
|
My mic has its own processor? 
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uBITX #933/2 Finally quite satisfied with operaton
#ubitx
Finally have this one where it will get it's top cover put on and the radio goes into the "go box".? With the addition of one of our RadI2Cino cards, an I2C 4 line by 20 character display, a Teensy 3.6 adapted to plug in place of the NANO, this one is on the air in what will be it's final configuration except for software updates when we release them.? (External USB connector in place so the cover need not be removed for remote control or Teensy 3.6 programming. One nice thing about using the Teensy is the built-in Real Time Clock!? UTC time displayed on the screen and with a backup coin cell battery, the clock stays active even when no +12V is applied to the radio.Also, I added Don, ND6T's neat little AGC mod and boy does that work nicely.? Here are a few pix of the radio as it now stands. Jim Sheldon, W0EB    
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Re: Transmit indicator light.
Max,
Here are the direct links to the images showing TX/RX LED wire-up for Sunil's (VU3SUA)?enclosure.
3 wires soldered to PCB:
Proto board connected to LED with series resistors:
If this doesn't work for you, I can include the images in an email to the address shown on your funwithtubes site.
Regards,
Gary
AG5TX
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Don, ND6T
LB3RE/LC0X "Rag" Stein-Roar
Doug K7IP
Jim Sheldon