So what? That site has nothing to do with how noise from static buildup sounds! The original message said "I usually use a tuner beween the antenna and the Bitexes - that works fine to tame the noise." Again, the tuner can't tame the noise which is actually likely atmospheric noise or electromagnetic interference from motors, lights, etc. Those are all induced from external sources which the tuner can't control. BTW, the original message said he was using a form of dipole, not a vertical. Most antenna tuners, be they an L-network or a T-network, do not provide a DC path to ground from both elements of an antenna. At least none that I am familiar with. The only one that does is the Z-match. Most Z-match tuners today are built for QRP only. Since my equipment has to do multiple service, having a QRP only tuner isn't high on my to-do list. tim ab0wr On Sat, 21 Apr 2018 12:14:49 -0500 "K9HZ" <bill@...> wrote: Here:
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: Saturday, April 21, 2018 11:25 AM
To: [email protected]
Subject: Re: [BITX20] receiver overload
Noise from static buildup varies with the weather and wind. If you
think you have static buildup then all you have to do is disconnect
your antenna, use a jumper cable to short each element to ground, and
then reconnect the antenna. If your noise level drops significantly
then you had static buildup. If not, then you are hearing atmospheric
noise and/or phase noise in the receiver. The two can be
differentiated by just disconnecting the antenna to see what kind of
noise drop you see.
Noise from static buildup is typically not static. It does not sound
like the white noise, more like a buzzing or popping, and sometimes
even like a musical tone.
A tuner, even one that is isolated by a capacitor from the antenna,
typically won't "tune" static buildup noise. The noise is basically
from small discharges caused by charge equalization. Can you use your
tuner to to "tune-in" or "tune-out" the noise from the static
discharge of a lightning strike? Mine won't. The "noise" from the
lightning strike comes through no matter where the tuner is set.
If noise in the receiver goes up and down as you operate your tuner
to find the best match between your receiver and your antenna it's
because it is actually working. It is highly unlikely that the noise
you hear going up and down is from static buildup on the antenna.
tim ab0wr
On Fri, 20 Apr 2018 20:21:25 -0500
"K9HZ" <bill@...> wrote:
I guess that then assumes you have a very simple tuner (Cap-L leg)?
No impedance transformers, inductors to ground, etc.
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 8:18 PM
To: [email protected]
Subject: Re: [BITX20] receiver overload
I agree! But if the problem here is static buildup then a tuner
won't help any more than the coax connector on the rig!
tim ab0wr
On Fri, 20 Apr 2018 17:37:45 -0500
"K9HZ" <bill@...> wrote:
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 ¨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 4:05 PM
To: [email protected]
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" <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.
|
Speaking of mics, I have to raise my voice almost to the level of shouting to get 5 watts out on 40 meters.? Is this normal or should I look for a problem? ? Regards. ? Max K 4 O D S. ? I've Never Lost the Wonder. ? Antique Electronics Site: ? ?
toggle quoted message
Show quoted text
From: [email protected] [mailto:[email protected]] On Behalf Of Mvs Sarma
Sent: Saturday, April 21, 2018 7:17 AM
To: [email protected]
Subject: Re: [BITX20] show your mic ? I had grabed a taperecorder mic with 3.5mm mono pin.
?replaced the cable with 2+shield.had a small pushed switchmounted and wired.
?repalced the 3.5mm momo pin to stereo pin. Here is a image of my mic.The pp9 battery helps to imagine the mic size.
regards
?sarma
?vu3zmv
|
Re: Coast to coast on my ubitx yesterday
Hi Tim
Yeah I do have a an oscope but the readings I gave you were from my swr meter. Is my meter right?? It is a cheap cb meter. Still the readings seem to close to what others have posted. Probably is my location and atmospherics but was able to reach out and touch someone as the old Bell ads once said. Yesterday I contacted someone in Tucson and today it was Nantucket.?
My antenna is a homemade choked dipole resonant on 40 and 80. Hung between trees overlooking a ravine. I use recycled RG6 from an old residential television system. I have thought about upgrading it but then I wonder what would be gained.?
I am running 13.8 on all circuits. I put details in my first post.?
I did not check the bias on the pa. But did go through the other calibration steps. The bfo was not set very close.?
This is my main HF rig now and probably will be for some time. I have thought about making the bitx40 a mobile unit.?
|
I strongly detect sarcasm in your post Skip, but others like to complain about such things as 'travesties' and crimes against the ghosts of Benton Harbor, but as a 6m AM transceiver this device is nearly worthless if operating 'good as new', and if it was a 'basket case' in need of serious repair, all the more justification to put the chassis to good use IMHO.
If you go to Dayton/Xenia you'll see plenty of these 2m and 6m lunchboxes offered up for very modest prices, if I find one clean enough I'd get one and do it myself - it's a great case and includes lots of room for a battery pack!
Ken, N2VIP
toggle quoted message
Show quoted text
On Apr 21, 2018, at 11:17 AM, Skip Davis via Groups.Io <skipnc9o@...> wrote:
Oh no another Benton Harbor lunchbox bit the dust only to be resurrected into a new and glorious life. Or is that a reincarnation as uBITX?
Skip Davis, NC9O
|
?I think the V3 dongle is a little more robust then the "Experimental: HF Direct Sampling Mode¡± software option for the RTL2832. When using the just the Q branch of the chip you bypass the R820T2 tuner and can tune in HF directly. The V3 dongle went a extra step from the typical chineese versions of these rtf-sdr dongle to include some filtering and other components as there is no front end after the Q branch. ?
You just need a good antenna system but its sensitivity is close to my commercial radio. I think it leaves open a lot of room to build on or integrate into a project very cheaply. It is a perfect sdr receiver for pan adapter alone even if your IF is below 28.8mhz by using the Q branch.?
Joe
toggle quoted message
Show quoted text
On Apr 21, 2018, at 1:11 PM, Jerry Gaffke via Groups.Io < jgaffke@...> wrote:
Thanks for the info! Sounds like the? "Experimental: HF Direct Sampling Mode" to receive frequencies? from 500khz to 28.8mhz? is not quite ready for prime time. Or at least, not for punters like me. Good to know. Jerry, KE7ER On Sat, Apr 21, 2018 at 09:20 am, Doug W wrote:
I have the same dongle and am happy with it.? You can order it on Amazon for the same price with prime shipping to boot.? I did experiment with direct sampling but in the end broke down and bought an upconverter? and later the enclosure.? It is not lost on me that all of that costs about the same as a BITX40 and by the time you throw in random connectors and what not about the same as a ?BITX.? I have not tried connecting it to a Pi but using an otg adapter I have used it with an old android phone.? I haven't used it on the phone in a while but I seem to remember using the free version of SDR Touch.? Prior to having a real antenna I was using this balun and random wire with limited success and a few cheap telescoping whip antennas.
I just did a quick search and as usual Adafruit has a solid tutorial on with links to libraries
For general ideas and knowledge you can't beat
|
Re: uBITX #933/2 Finally quite satisfied with operaton
#ubitx
Jim,
Fantastic build!? Quite a milestone in itself to have converted baseline Raduino functionality from an?ATmega328 to a Kinetis K66 Arm M4.
It's an extreme upgrade to the 'digital' micro-controller hardware side of the uBITX, paving the way for many additional enhancements and features to be handled by the micro-controller.
I applaud the work you and W2CTX have done here.??
Thank You for sharing your progress,
Gary
AG5TX
|
Here:
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@...
toggle quoted message
Show quoted text
-----Original Message----- From: [email protected] [mailto: [email protected]] On Behalf Of Tim Gorman Sent: Saturday, April 21, 2018 11:25 AM To: [email protected]Subject: Re: [BITX20] receiver overload Noise from static buildup varies with the weather and wind. If you think you have static buildup then all you have to do is disconnect your antenna, use a jumper cable to short each element to ground, and then reconnect the antenna. If your noise level drops significantly then you had static buildup. If not, then you are hearing atmospheric noise and/or phase noise in the receiver. The two can be differentiated by just disconnecting the antenna to see what kind of noise drop you see. Noise from static buildup is typically not static. It does not sound like the white noise, more like a buzzing or popping, and sometimes even like a musical tone. A tuner, even one that is isolated by a capacitor from the antenna, typically won't "tune" static buildup noise. The noise is basically from small discharges caused by charge equalization. Can you use your tuner to to "tune-in" or "tune-out" the noise from the static discharge of a lightning strike? Mine won't. The "noise" from the lightning strike comes through no matter where the tuner is set. If noise in the receiver goes up and down as you operate your tuner to find the best match between your receiver and your antenna it's because it is actually working. It is highly unlikely that the noise you hear going up and down is from static buildup on the antenna. tim ab0wr On Fri, 20 Apr 2018 20:21:25 -0500 "K9HZ" <bill@...> wrote: I guess that then assumes you have a very simple tuner (Cap-L leg)?
No impedance transformers, inductors to ground, etc.
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 8:18 PM
To: [email protected]
Subject: Re: [BITX20] receiver overload
I agree! But if the problem here is static buildup then a tuner won't
help any more than the coax connector on the rig!
tim ab0wr
On Fri, 20 Apr 2018 17:37:45 -0500
"K9HZ" <bill@...> wrote:
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 ¨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 4:05 PM
To: [email protected]
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" <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.
|
Thanks for the info!
Sounds like the? "Experimental: HF Direct Sampling Mode" to receive frequencies?
from 500khz to 28.8mhz? is not quite ready for prime time.
Or at least, not for punters like me.
Good to know.
Jerry, KE7ER
toggle quoted message
Show quoted text
On Sat, Apr 21, 2018 at 09:20 am, Doug W wrote:
I have the same dongle and am happy with it.? You can order it on Amazon for the same price with prime shipping to boot.? I did experiment with direct sampling but in the end broke down and bought an upconverter? and later the enclosure.? It is not lost on me that all of that costs about the same as a BITX40 and by the time you throw in random connectors and what not about the same as a ?BITX.? I have not tried connecting it to a Pi but using an otg adapter I have used it with an old android phone.? I haven't used it on the phone in a while but I seem to remember using the free version of SDR Touch.? Prior to having a real antenna I was using this balun and random wire with limited success and a few cheap telescoping whip antennas.
I just did a quick search and as usual Adafruit has a solid tutorial on with links to libraries
For general ideas and knowledge you can't beat
|
|
|
There is no free lunch, but there is always the free lunchbox!
On Sat, 21 Apr 2018, 21:47 Skip Davis via Groups.Io, <skipnc9o= [email protected]> wrote: Oh no another Benton Harbor lunchbox bit the dust only to be resurrected into a new and glorious life. Or is that a reincarnation as uBITX?
Skip Davis, NC9O
|
Re: Coast to coast on my ubitx yesterday
Do you have access to an oscilloscope or spectrum analyzer? The most I can get out of mine was about 15 watts. And when I go over 10 watts the two-tone, 3rd order IMD rises to only about 18db, a terrible figure. I had to decrease my output to 10 watts to have a reasonable 3rd order IMD. What are you running for voltage on the power amplifier? tim ab0wr On Sat, 21 Apr 2018 03:48:03 -0700 davesters@... wrote: Hi Tim
I was getting 25 watts on my watt meter. om 80m.
Today hooked up a 10m dipole and got 2.5watts with keyer down. With a
low swr. Delta Alpha Victor Echo
|
Noise from static buildup varies with the weather and wind. If you think you have static buildup then all you have to do is disconnect your antenna, use a jumper cable to short each element to ground, and then reconnect the antenna. If your noise level drops significantly then you had static buildup. If not, then you are hearing atmospheric noise and/or phase noise in the receiver. The two can be differentiated by just disconnecting the antenna to see what kind of noise drop you see. Noise from static buildup is typically not static. It does not sound like the white noise, more like a buzzing or popping, and sometimes even like a musical tone. A tuner, even one that is isolated by a capacitor from the antenna, typically won't "tune" static buildup noise. The noise is basically from small discharges caused by charge equalization. Can you use your tuner to to "tune-in" or "tune-out" the noise from the static discharge of a lightning strike? Mine won't. The "noise" from the lightning strike comes through no matter where the tuner is set. If noise in the receiver goes up and down as you operate your tuner to find the best match between your receiver and your antenna it's because it is actually working. It is highly unlikely that the noise you hear going up and down is from static buildup on the antenna. tim ab0wr On Fri, 20 Apr 2018 20:21:25 -0500 "K9HZ" <bill@...> wrote: I guess that then assumes you have a very simple tuner (Cap-L leg)?
No impedance transformers, inductors to ground, etc.
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 8:18 PM
To: [email protected]
Subject: Re: [BITX20] receiver overload
I agree! But if the problem here is static buildup then a tuner won't
help any more than the coax connector on the rig!
tim ab0wr
On Fri, 20 Apr 2018 17:37:45 -0500
"K9HZ" <bill@...> wrote:
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 ¨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 4:05 PM
To: [email protected]
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" <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.
|
I have the same dongle and am happy with it.? You can order it on Amazon for the same price with prime shipping to boot.? I did experiment with direct sampling but in the end broke down and bought an upconverter? and later the enclosure.? It is not lost on me that all of that costs about the same as a BITX40 and by the time you throw in random connectors and what not about the same as a ?BITX.? I have not tried connecting it to a Pi but using an otg adapter I have used it with an old android phone.? I haven't used it on the phone in a while but I seem to remember using the free version of SDR Touch.? Prior to having a real antenna I was using this balun and random wire with limited success and a few cheap telescoping whip antennas.
I just did a quick search and as usual Adafruit has a solid tutorial on with links to libraries
For general ideas and knowledge you can't beat
|
Oh no another Benton Harbor lunchbox bit the dust only to be resurrected into a new and glorious life. Or is that a reincarnation as uBITX?
Skip Davis, NC9O
|
Re: Update to the VK2ETA variation of Ian Lee's KD8CEC uBitx software
#ubitx
John, I only saw one picture of the radio display and no schematic or picture for the ATU also.
Skip Davis, NC9O
|
Very cool, I haven't played with those RTL dongles for a few years now.
May have to try this one out.
A bit scary though, as the website is not well organized.
For example, they sell an optional dipole wire antenna with coax for use with this thing,
but never give any indication of how long it is.
That buy page you pointed to has no real information about what the heck you are getting,
here's a somewhat more informative page with pointers to a datasheet and user's guide:
? ??
Digging around some I find out they mostly assume you are running SDR# software.
If I get one, would like to box it up with a little RasberryPi.
Ideally figure out how to make it work with a cheap LCD display instead
of having a $100 hdmi monitor showing the waterfall.
All these RTL-SDR dongles have 8 bit ADC's.? Really amazing to me that you can suck in
the entire radio spectrum without front end filters, send it straight to 8 bit ADC's.
and still do a reasonable job of resolving over a ghz worth of individual stations.?
The SDR-Play has 12 bit ADC's, the SoftRock guys feel they need filters for each
HF band and prefer a 24 bit sound card.? Would be interesting to compare results.
These v3 guys have an "Experimental: HF Direct Sampling Mode" to receive frequencies
from 500khz to 28.8mhz.? The basic RTL-SDR chips are good from 24mhz to 1.766ghz,
and were originally intended for European DVB-T digital TV reception.
I've been out of the loop on these, please correct any errors in what I report above.
Jerry, KE7ER
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On Sat, Apr 21, 2018 at 12:12 am, Joe Puma wrote:
I would go with the v3 dongle. I use it with my Yaesu FT-840. And I have about 4 others that make up my radio farm. ?To me it¡¯s the best design of the dongle type SDR¡¯s no need to get the more expensive SDR¡¯s like LimeSDR or SDRplay?
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Re: uBITX #933/2 Finally quite satisfied with operaton
#ubitx
The filter on standoffs is a broadcast band interference filter. ?I have a 500 watt AM station less than a mile from my house and also KFDI's AM station (10KW) 3.5 miles from the house. ?This filter is very necessary to keep them out or no ham signals could be heard.
Jim
------ Original Message ------
Sent: 4/21/2018 9:00:24 AM
Subject: Re: [BITX20] uBITX #933/2 Finally quite satisfied with operaton #ubitx
Looks- Professional, but you are the "professional" Amateur.. I notice the volume control is pointing to "FUN"
Can you explain VRB ? T800 confirm - sidetone frequency?... Then what is S25? Keyer speed?? Red and Green are push buttons? VFO select and Function?
What is the filter for on standoff's at the BNC connector?
Great Job...
Regards,
Larry W8LM
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Re: uBITX #933/2 Finally quite satisfied with operaton
#ubitx
Larry, That is using our RadI2Cino card with a special Teensy 3.6 processor, not the NANO. ?RadI2Cino is available for sale in kit form, but the Teensy adapter is still prototype (may never be offered) and without the Teensy you won't see all the info on that display.
V is on/off for the input voltage (+12 rail) monitor, R is either N or R and indicates paddle interface normal (Tip=dot) or reverse (Tip=dash) and B indicates Iambic Keyer, mode B (A or B is selectable. ?T800 = CW side tone frequency - adjustable from 400Hz to 1KHz and S25 = built in Iambic keyer speed adjustable from 5 to 50 WPM. ?FUN=Function (same as encoder switch) the other one is the A/B VFO select and a hold gives you "Split".
This is only available with the RadI2Cino card, an I2C display and the real time clock is only available with a Teensy processor.
Jim
------ Original Message ------
Sent: 4/21/2018 9:00:24 AM
Subject: Re: [BITX20] uBITX #933/2 Finally quite satisfied with operaton #ubitx
Looks- Professional, but you are the "professional" Amateur.. I notice the volume control is pointing to "FUN"
Can you explain VRB ? T800 confirm - sidetone frequency?... Then what is S25? Keyer speed?? Red and Green are push buttons? VFO select and Function?
What is the filter for on standoff's at the BNC connector?
Great Job...
Regards,
Larry W8LM
|
Re: uBITX #933/2 Finally quite satisfied with operaton
#ubitx
Looks- Professional, but you are the "professional" Amateur.. I notice the volume control is pointing to "FUN"
Can you explain VRB ? T800 confirm - sidetone frequency?... Then what is S25? Keyer speed?? Red and Green are push buttons? VFO select and Function?
What is the filter for on standoff's at the BNC connector?
Great Job...
Regards,
Larry W8LM
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Hi
I saw KD8CEC upgraded his display to more info
Any display from ebay can do this?
Best Regards,
Stein-Roar Brobakken
post@...
LB3RE K3RAG
Skype: lb3re.rag
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_Dave_ AD0B
K9HZ
Skip Davis
Jim Sheldon
LB3RE/LC0X "Rag" Stein-Roar
