Re: Totally Absurd -- Farhan being questioned in a police station about doctored sat picture
Another piece of class stupidity? : may years go I was working as an Instr engr in Melbourne on the telemetry and other matters to with a gas plant to go up in far north Pakistan.? This was wild west country where warlords not the? Pakistani army or police force made the law. included was a spread spectrum modem box that communicated from? here to there (I wont' say where for obvious reasons )? Data was gas flow rate , temperature that sort of thing.? Well someone in Pakistan suddenly had an idea that in a Paki/Indian war,? Ashan Farhan's brother/uncle? might lob over some rocket? (indirectly guided by the frequency hopping signal)? and wipe out the gas processing station.!!!? Pakistan does not have a great deal of natural gas so this would be a significant act.
? So we had to write a technical paper why this was next to impossible (did anyone ever read it ??)? and then got permission to put the link in. (Cable / Fibre optic is always? possible but is a much more expensive option if you have to trench for that one cable only).? So If I suddenly go QTE you know that the Paki secret police has got to me.
Quite how we in Melbourne (Aker Kvaerner at the time ) got the yellow jersey to do that job is a bit of a mystery.? There might have been some overseas aid component to it.. hard to say.? TEF
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Re: UbitX audio hiss but no rx
The uBitx is full breakin.? You just attach a key and press it.
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Re: God Speed on your flight Farhan
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Buxton said Fox-1Cliff will share dispenser space with ExseedSat-1, a CubeSat built by an eight-person team at Exseed Space Innovations Private Limited, based in Hyderabad, India, and co-founded by Ashhar Farhan, VU2ESE, the designer of the ?BitX SSB/CW transceiver. Farhan and engineer Gurudatta Panda, VU3GDP, were on hand for the integration. ExseedSat-1 carries an Amateur Radio FM transponder and APRS digipeater, with a repeater, digipeater, and telemetry downlink of 145.900 MHz FM, and a repeater and digipeater uplink of 435.340 MHz.?
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Re: God Speed on your flight Farhan
Okay so now for the questions, what is the name of the cubesat as I didn¡¯t catch and how can we track it? will our favorite satellite apps track its keplar data? What frequency is the transponder and is this all on a website?
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Successful launch and first stage reentry, Hurray!
Roy WA0YMH On Mon, Dec 3, 2018, 12:26 PM Joe Puma < kd2nfc@... wrote: We¡¯re all watching on this monumental moment. wow 64 sats deployed all at once.
Lets go!!
Joe
kd2nfc
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Re: UbitX audio hiss but no rx
How do I switch it to CW mode?? I have no idea...? I can't see it as an option...
Sean
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From: Sean Pearce <seanpearce78@...>
Sent: 03 December 2018 19:08
To: David Berkompas
Subject: Re: [BITX20] UbitX audio hiss but no rx
?
I know this sounds silly, but where is the option to change it to CW?
Sent from my Huawei Mobile
-------- Original Message --------
Subject: Re: [BITX20] UbitX audio hiss but no rx
From: David Berkompas
To: [email protected]
CC:
I had the same problem.
(Well, at least I thought I did, turns out it was a PICNIC error).
Put the radio in CW mode, and find an AM station.
Hope that helps.
Dave - AI6K
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i was trying dr lee code. i can download the files, but it won't
work because i don't have a way of
decodeing the MD and the ICO?
On 12/3/2018 8:20 AM, Jack Purdum via
Groups.Io wrote:
Who's code are you trying to download: the stock code from
HF Signals or Dr. Lee's code?
Jack, W8TEE
On Monday, December 3, 2018, 10:08:22 AM EST, MONEYSMITH
<w4nfr@...> wrote:
I AM VERY NEW TO THIS. I DO HAVE A WORKING
uBITX HF RADIO TRANSCEIVER.
I DO NOT KNOW MUCH ABOUT PROGRAMMING.? I HAVE
A QUESTION.
HOW DO I GET THE FILE OR FILES TO DECODE THE
MD AND UCO FILE EXTENSIONS?
I NEED TO KNOW THIS AND WHICH FILES ACTUALLY
GET DOWN LOADED TO THE
NANO?
---
This email has been checked for viruses by
AVG.
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Re: God Speed on your flight Farhan
Successful launch and first stage reentry, Hurray!
Roy WA0YMH
On Mon, Dec 3, 2018, 12:26 PM Joe Puma < kd2nfc@... wrote: We¡¯re all watching on this monumental moment. wow 64 sats deployed all at once.
Lets go!!
Joe
kd2nfc
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Call for Papers and Presentations for the second Super VHF Conference, April 26-28, 2019, in Sterling, VA, near Washington, DC. ?
The the second Super VHF Conference is jointly sponsored by Packrats, NEWS Group, and SVHFS, and Hosted by the Grid Pirates Contest Group and Directive Systems and Engineering
details at
Presentations or papers are welcome on VHF, UHF, microwaves, and higher. ?All aspects welcome, technical and non-technical - operating, contesting, homebrewing, roving, software, EME, surplus, antennas, test equipment, amplifiers, SDR, 47 GHz superregen, whatever. ?Your winter project might be a good candidate - take some pictures.
N2CEI and W1GHZ will be coordinating the proceedings book and CD.
submissions and questions to:
conferencepapers@...
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Re: Spectrum purity of uBITX and BIT40
Seem to hear that self build, home brew is more relax under fcc laws than mass production factroy machine, to allow progress
in test, training, education, etc., in principle.? ?
NO.? The rules for factory and HB are the same.? They are not hard to meet but reasonable attempts to meet them are expected.
So far the relay is not the improved one.? Its not one its four and they are a pain to extract.??
Some people have built the uBitx as a ground up project using a self designed board or ugly (Manhattan, dead-bug style) on
a sheet of copper clad as a ground surface and the general result is much better.? Layout is everything.
Allison
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Re: Totally Absurd -- Farhan being questioned in a police station about doctored sat picture
Ashar
Mazeltov on the awesome satellite work
Regards
73
Laurence Oberman
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On Mon, Dec 3, 2018 at 11:42 AM Ashhar Farhan <farhanbox@...> wrote:
Guys,
It has blown over. Thanks for all the concern.
73, f
On Sat, 1 Dec 2018, 12:53 iz oos <and2oosiz2@... wrote:
Gosh! Never go against the Big Three!!! Glad to hear everything should be over!!!
Il 30/nov/2018 21:14, "Giancarlo via Groups.Io" <i7swx@...> ha scritto:
Hi Farhan,
sorry to know about the problem you faced. Dodgy people re all over and also people that do not understand, still dodgy..hi.
My remote support for you.
73
Gian, I7SWX
Mail priva di virus. www.avast.com
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Re: uBITX - Limiting power output
Charles French,
One way to find out... try it.? However use a good pot.? The shields go to one end of
the resistor and not to any ground near the pot and both shields are used at ground
where the pot was on the board.? Short leads and good lead dress keeping the two
shielded wires away from the board. The likely problem is RF feedback and oscillation
Me I'd dial it down as the sweet spot for passably decent IMD was found to be
around 2W anyway (for 80/40/20).
The current home brew radio I use with the 1208 is designed for it and the internal attenuator
was dialed down to 3db so all I needed the radio to deliver was about 3mW! Its dedicated to
the 1208.? Why?? Running the transverter and developing power to dump in resistors?resulted
in a power hungry system (nearly 40W in for about 10 out).? Doing a TRX specifically
for that lowered that to less than 26W (at 11W out) making it far more battery friendly.
Over the years I had my first Hb 20mSSB (3.5-4W),? WM20 (about 3w), and a TT505 Argonaut
(about 5W)? and all of them at one point or another drove the 1208 until I built a low low power
radio as a driver.? ?It iss a fun backup to my HF-6M (Eagle) and TT526 6n2 and five HB 6M
monoband radios.
Allison
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Re: God Speed on your flight Farhan
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God Speed on your flight Farhan
We¡¯re all watching on this monumental moment. wow 64 sats deployed all at once.
Lets go!!
Joe
kd2nfc
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Re: uBitx Function Button ERROR
I had removed the "Extra" purple wire that is an ADC input often used for an S meter.? I assume that you have a v3 or v4 ubitx (I have the version 4).? You explained in one of your posts that the problem goes away when you ground the output connector on the uBitx with your hand.? That is pointing to the RF coming back on the shield of the coax.? Do you have a 1:1 balun on the dipole?? If not, again I would look to grounding and adding the balun.? MFJ or others make both baluns and full cut antennas. Have you tried grounding the case? If problems persist, I would also look at adding ferrites on the control lines from the encoder to the Raduino board.? That was one of the things I tried, again, helped but the grounding and ferrites on the feed to the antenna were the things that solved it for me. I would also verify that you are not over driving the audio: I could reduce the problem by lowering my mic gain.? This also reduces the power out, so may be just a function of the correct frequency and power getting back to the nano. Since all was well with the plastic case, I am still leaning towards the RF coming back down the coax brain, and surrounding the nano.? If there is unbalanced RF on the braid, putting the uBitx in case that is not grounded may not have helped. From another post:
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Fri, Nov 30, 6:56 AM (3 days ago)
?
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?
?
I had the same issue, however on 20m.? Traced it to rf riding the coax braid back from an off center fed dipole (MFJ-2010).? Solved it by grounding the shield before the radio, and placing a ferrite snap on core over the coax (RG8x) between the ground point and the connection to the radio.
?
Tried the ground only first, and it helped (could raise the power out to 6 watts), then added the ferrite to get it back to peak at 14 watts without causing the menu selection.? I did not have any issues on 40m.
?
My setup (using RG8x, PL259 connectors and PL259 Lightning arrester for grounding) is:
?
uBitx ======== SWR/PWR Mtr== Arrester ======== OCFD
? ? ? ? ? ? ? ? ^? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?^
? ? ? ? ? ? Ferrite? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?Ground (water pipe in basement)
?
Hope that helps.
?
Evan
AC9TU
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Re: uBitx Function Button ERROR
RF pickup is a bit unpredictable. Long wire, more pickup
ONLY if they use ADC in way I described as no push button board circuit on web.
Then, 0.1uF on ADC line and a good grounding point, short leads on the
Arduino board
ADC is mega ohm high impedence input. Can add
from push button long line
10k ohm series
0.1 uF to ground
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On 12/4/18, Daniel <gonewiththeego@...> wrote: Hi, and thanks for the informations. I would like to say that my antenna is
an attic dipole for 40m and I use 50 ohms coax. What I didn't said in the
beginning is that I disconnected the display and I used some wires to
connect it to the Raduino. But the Raduino itself is still in the original
socket. Can it be this happening because of the display wires ? And somebody
mentioned above about a capacitor of 0.1uF in the ADC line... should I put
this in paralel or in series with ADC line?
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Re: Totally Absurd -- Farhan being questioned in a police station about doctored sat picture
Guys, It has blown over. Thanks for all the concern. 73, f
Gosh! Never go against the Big Three!!! Glad to hear everything should be over!!!
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Re: uBitx Function Button ERROR
Hi, and thanks for the informations. I would like to say that my antenna is an attic dipole for 40m and I use 50 ohms coax. What I didn't said in the beginning is that I disconnected the display and I used some wires to connect it to the Raduino. But the Raduino itself is still in the original socket. Can it be this happening because of the display wires ? And somebody mentioned above about a capacitor of 0.1uF in the ADC line... should I put this in paralel or in series with ADC line??
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How big is it? What are the suggested solutions? An effective solution could be adding an external 1/4 wave open stub cut for 12mhz made with reasonably low loss cable. In practice it would consist of adding a Tee connector and a piece (13.5feet) of RG213. It might alter SWR somehow differently across the bands but in case one uses a tuner it should not be a big problem. It might attenuate by some pinnuts the output power.
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Is this kit still available or did I miss it?
Thanks,?
Scott
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Re: Spectrum purity of uBITX and BIT40
A two tone test will check for IMD (intermodulation distortion, google it!).
It does not check for spurs or harmonics, which are the primary issues with the stock uBitx.
IMD can make your signal sound bad, and cause interference to those operating nearby on frequency.
If you have bad IMD, you will probably be told about it.
The stock uBitx with the mike gain set to a reasonable level will have enough IMD to be
slightly alarming when looking for it with a spectrum analyzer.
But the IMD products are way down (50dB or so) once you get a couple khz away.?
And thus it's a legal transmission anywhere AM phone is legal (at least with respect to IMD).
When transmitting at 5 or 10 watts, the IMD is probably not perceptible to someone using an adjacent channel.
If you have bad spurs and/or harmonics, you will be interfering with operations
on totally different frequencies.
For example, when operating at 28mhz, there's a? spur at 45mhz-28mhz=17mhz.
This particular spur is due to the 2*45mhz second harmonic of the first IF?
mixing with the high side clk2 VFO.? The VFO is always at 45mhz+DialFreq.
In this case, the spur is at? 2*45mhz - (45mhz+28mhz) = 45mhz - 28mhz = 17mhz.?
We also have a spur at 12mhz, due to crosstalk within the si5351? from the BFO at clk0
into the VFO at clk2.? This 12mhz energy on clk2 goes through the mixer at T2 unmolested,
and continues on through the transmit power amp and the transmit low pass filters.
Harmonics are simple integer multiples of the operating frequency.
For example, when operating at 7mhz, we get harmonics at 2*7=14mhz and 3*7=21mhz.
The transmit low pass filters at L11 through L22 should take these harmonics out,
but the stock uBitx relays (and to some extent, the board placement and routing)?
allow the harmonics to sneak past the low pass filter.
Also, for various reasons, we have some carrier leakage, though not too bad.
This results in a not quite suppressed carrier riding along with our SSB signal,
sort of like an AM phone signal.? Not really much of an issue at 5 or 10 watts,
but it does make our signal a bit wider than it should be.
Spurs, harmonics, IMD, and residual carrier are why you should think twice
before?adding a linear amp to the uBitx.
Like any rig without ALC (automatic level control), increasing the mike gain
too much (or shouting into the mike) will result in IMD.
The Bitx40 has a much easier job with respect to spurs and harmonics.??
There is a 7mhz bandpass filter before the transmit power amp, which knocks out all those spurs.
And with only one transmit low pass filter there is?no easy path for harmonics to leak out.
With too much mike gain it will have IMD, and there is some carrier leakage,
but these are relatively minor issues.
Jerry, KE7ER
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On Sun, Dec 2, 2018 at 09:27 PM, Wayne Leake wrote:
?I notice that nobody mentions the best way to check an SSB outgoing signal.
?You need a good two tone audio signal generator. Along with a wide band scope, check that you see a good sine wave pattern.
??
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YO8UFO
Scott Bridges