My Bitx is still open face on a piece of plywood, works fine..
Many are using unshielded plastic boxes as enclosures.
But if you are receiving interfering signals, a shielded?enclosure can help,
If you think you might need shielding, here's a few things to consider:
Interfering signals can come from gear like a faulty wall wart power supply, or a digital clock on the stove.
The microphone and speaker and power cables may need filtering to avoid RFI entering.
You might also want a common mode choke in the coax out to the antenna to prevent
signals (perhaps RFI) from getting picked up by the coax instead of only from the somewhat remote antenna.
Such shielding can also prevent the Bitx's? BFO, VFO, etc from interfering with other gear in the area.
Try the Bitx out in an RF quiet location with a portable antenna, see if that does away with any interfering signals.
?
A quick and dirty wrap around the outside of the rig with aluminum foil will determine if shielding helps.
I'd include a battery and speaker inside that wrap job, try it first without any antenna connected,
some interfering signals (birdies) will still be present due to harmonics of the local oscillators mixing.
Then connect an antenna into the wrap job, making sure the foil connects well with the shell
of the antenna coax connector
Jerry, KE7ER
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On Mon, Feb 19, 2018 at 09:10 am, Tim Young wrote:
Carl did a nice job. I lined mine with copper foil to reduce interference. Others may be in a better position to comment on whether it is necessary or not.
https://www.ebay.com/itm/Tapes-Master-2-x-10ft-Copper-Foil-Tape-EMI-Shielding-Conductive-Adhesive-2/282438503301?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649
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Re: HFsignals no longer selling just vfo
They are putting up a shopping cart and are waiting for it to be ready to offer it and probably a lot more.
On Mon, Feb 19, 2018 at 6:58 AM, Jack Purdum via Groups.Io <jjpurdum@...> wrote: These are incredibly useful when experimenting (i.e., messing around) with the Nano. Get a handful of Dupont connectors and have at it!
Jack, W8TEE
From: LKNDAVE via Groups.Io <novatronix=[email protected]>
To: [email protected]
Sent: Monday, February 19, 2018 9:27 AM
Subject: Re: [BITX20] HFsignals no longer selling just vfo
-- Michael Shreeve N6GRG
15901 Cloverdale Road
Anderson, CA 96007
530-410-8678
"Don't worry about a thing, 'Cause every little thing gonna be all right!" -Bob Marley
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Re: Maximum safe input voltage to ubitx?
What kind of 18650 batteries are you using? E-Cig batteries are designed for an intermittant high current drain while keeping their voltage up.
Vince.
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On 02/19/2018 06:49 AM, Mvs Sarma wrote: during Tx time the battery drops . Yes, You said you wont diacharge
below 3.3V. I observe here that the 18650 cells show 3V while on 1 or 2
amps of discharge. That is what mde me feel the regulator trouble.
However , perhaps using a LDO regulator at 12V you could overcome this
issue.
Thanks for the reply, John.
regards
sarma
vu3zmv
Regards
MVS Sarma
On Mon, Feb 19, 2018 at 4:52 PM, John <passionfruit88@...
<mailto:passionfruit88@...>> wrote:
Hello Sarma,
Regarding the voltage drop, I do not discharge my lithium batteries
below 3.3V per cell.
So a 4S battery pack would need to stop being used at 13.2V. With a
regulators' drop around 1.5V (we only pull 0.4-0.5A from the main
board on Tx, and the finals go strait to the battery), the final
voltage to the main board is around 11.7V. Quite a decent supply
voltage.
Regards,
John (VK2ETA)
--
Michigan VHF Corp.
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Re: Recommendations for learning coding for Bitx and/or arduino
Amazon.com carries it. Make sure you get the 2nd edition...it's a better book and has a chapter on C++ so you can "understand" most library code.
Jack, W8TEE
From: Joe Puma <kd2nfc@...>
To: [email protected]
Sent: Monday, February 19, 2018 12:30 PM
Subject: Re: [BITX20] Recommendations for learning coding for Bitx and/or arduino
Where can we get this book Jack? On Feb 19, 2018, at 3:16 AM, Paul Schumacher via Groups.Io < wnpauls@...> wrote: Yes!? Jack's book "Beginning C for Arduino "?is great!
Paul K0ZYV
From: Jack Purdum via Groups.Io < jjpurdum@...> To: [email protected] Sent: Sunday, February 18, 2018 9:52 PM Subject: Re: [BITX20] Recommendations for learning coding for Bitx and/or arduino Can I get someone else to say it for me...
Jack, W8TEE
From: Mike Lichtman via Groups.Io < tchrme@...> To: [email protected] Sent: Sunday, February 18, 2018 10:32 PM Subject: [BITX20] Recommendations for learning coding for Bitx and/or arduino Okay, I have played with boatanchors and know how to work on tube type radios. Time
to learn some coding for the BitX and/or Arduino. I have a Mac computer. Where should I?
start? Which books are best? I am open to all recommendations? 73 Mike KF6KXG
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Re: Recommendations for learning coding for Bitx and/or arduino
Be warned very addictive, got at least two of Jacks books and am well and truly hooked In only a couple of months.
Great people on this forum and very helpful.
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Re: [SPAM] Re: [BITX20] RD16HHF1 in the uBITX
#ubitx
Hi, I just unpacked my ¦Ìbitx to check what was supplied and no time yet to hook it up. Just a thought on the output power drop. Can you try simulating reducing C93 and C94 so that with the corresponding higher reactance at lower frequencies less drive will be available at lower frequencies. A value could be found to more or less even out the drive across the frequency range since the gate capacitance higher reactance at lower frequencies?will compensate for the increased capacitive reactance of C93 and C94 while on the higher frequencies the opposite will be true.
Regards Lawrence
On Mon, Feb 19, 2018 at 4:35 PM, K9HZ <bill@...> wrote: > I did find the following in my simulations though... if you change R85 from 100 to 470 ohms (pre-driver stage bias), change R261 and R262 from 100 to 1K ohm, run RV1 wide open (full drive) and then use a compensating capacitor (your 33pf at 14 MHz) across T11 primary with a 1:4 transformer: >? > 6M - 48pf > 10M - 110pf > 20M - 320pf > 40M - 680pf > 80M - 1,500pf > 160M - 4,700pf >? > It shows at least 20 watts out on each band except for 6 meters... where it peaks at 12 watts. >? >? ? ? ? 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: Like us on Facebook! ? ? email:? bill@... ? ? ? ?Dr. Schmidt -- no way to put some feedback into the circuit in some manner to stabilize the gain?? ? 1000 pf across the 22 ohm emitter resistors to have a 3db break at 7 MHz? ? ?
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Re: Videos for how to wire Ubitx
?Excellent job Neo.? Sometimes an explanation helps clarify things.? Especially for someone new to kit building, etc.? I love to see all the community work around this.? Everyone bringing their expertise to help out.?? Thanks again.
73, Michael
KM4OLT
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Re: Recommendations for learning coding for Bitx and/or arduino
Where can we get this book Jack?
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On Feb 19, 2018, at 3:16 AM, Paul Schumacher via Groups.Io < wnpauls@...> wrote: Yes!? Jack's book "Beginning C for Arduino "?is great!
Paul K0ZYV
From: Jack Purdum via Groups.Io <jjpurdum@...>
To: [email protected]
Sent: Sunday, February 18, 2018 9:52 PM
Subject: Re: [BITX20] Recommendations for learning coding for Bitx and/or arduino
Can I get someone else to say it for me...
Jack, W8TEE
From: Mike Lichtman via Groups.Io < tchrme@...> To: [email protected] Sent: Sunday, February 18, 2018 10:32 PM Subject: [BITX20] Recommendations for learning coding for Bitx and/or arduino Okay, I have played with boatanchors and know how to work on tube type radios. Time
to learn some coding for the BitX and/or Arduino. I have a Mac computer. Where should I?
start? Which books are best? I am open to all recommendations? 73 Mike KF6KXG
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Carl did a nice job. I lined mine with copper foil to reduce interference. Others may be in a better position to comment on whether it is necessary or not.
https://www.ebay.com/itm/Tapes-Master-2-x-10ft-Copper-Foil-Tape-EMI-Shielding-Conductive-Adhesive-2/282438503301?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649
Tim
WB7UVH
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On 2018-02-19 09:32, Carl Beck wrote:
I have updated my PDF File as a result of questions in assembling the uBITX in my Case.? After I post my PDF File on the forum: for a couple of days I get request fir the case and questions.? It seems the it falls off the radar until I post again.? I am getting good reviews from those who ordered my case so take a look: you may want one.
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Re: Recommendations for learning coding for Bitx and/or arduino
Jack's book is great!? Got it for my birthday last month.....:)
Tom
AB7WT
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Re: Contacts with completed BITX transceivers
I'd up for a test. I know my 40 meters works and I'm sure I can test at 30 as well. Email me to coordinate KC9RGE@...
On Feb 17, 2018 09:07, "Ken Brown" < n4so.ken@...> wrote: Anyone with a completed BITX radio?? QRV on the 30 meter band.?
?A 40 meter antenna is in the works.
No response from the first request. Anyone???
Ken N4SO
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Re: Maximum safe input voltage to ubitx?
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On Mon, Feb 19, 2018 at 8:40 PM, Jack Purdum via Groups.Io <jjpurdum@...> wrote: It says "No longer available"
Jack, W8TEE
From: VE7WQ <v@...>
To: [email protected]
Sent: Monday, February 19, 2018 1:52 AM
Subject: Re: [BITX20] Maximum safe input voltage to ubitx?
Better yet, a SEPIC (non-inverting) PM-6009DU Buck-Boost 4A converter:
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I have updated my PDF File as a result of questions in assembling the uBITX in my Case.? After I post my PDF File on the forum: for a couple of days I get request fir the case and questions.? It seems the it falls off the radar until I post again.? I am getting good reviews from those who ordered my case so take a look: you may want one.
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Re: Contacts with completed BITX transceivers
Ken, I'd sure be up for a sked. Either 30 or 40 in the mornings would be best. Probably 30 would have the best propagation. Email me a nd6t@.... 73, Don
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Re: Second batch of uBITX shipping?
#ubitx
For us Europeans, 'snail mail' seems to be the best way (and often fastest by not using DHL) as DHL seems to always incur customs inspection and charges etc.
Nigel - G4ZAL
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Re: Maximum safe input voltage to ubitx?
I have a few on hand already Jack. I will try that, hopefully they are not too noisy.
thanks,
Paul K0ZYV
From: Jack Purdum via Groups.Io <jjpurdum@...>
To: [email protected]
Sent: Monday, February 19, 2018 9:11 AM
Subject: Re: [BITX20] Maximum safe input voltage to ubitx?
It says "No longer available"
Jack, W8TEE
From: VE7WQ <v@...> To: [email protected] Sent: Monday, February 19, 2018 1:52 AM Subject: Re: [BITX20] Maximum safe input voltage to ubitx? Better yet, a SEPIC (non-inverting) PM-6009DU Buck-Boost 4A converter:
http://tinyurl.com/y9ysz6k5
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Re: Micron? long, logical and hopefully both educational and amusing ...
Here's my 2?, but maybe I'm ? crazy, or even crazy?. ?Come se dice en Espa?ol?? ?Ay caramba! Are you paying in $, €, ?, or ??? Is that knob ?25.4mm?? All hail the ?B?!? Or its little brother the B40?!? Which is better, a 40% discount, or 40¡ë?? All this fussing is like a ? or worse, ?, in my heart.? Maybe it's the weather; we haven't seen 70¡ãF for a while, three months ¡Àa few days anyway.
Typed using the codes from ?which are of the form?ALT+0xxx.
But ohm and pi you gotta copy and paste.
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Re: [SPAM] Re: [BITX20] RD16HHF1 in the uBITX
#ubitx
> I did find the following in my simulations though... if you change R85 from 100 to 470 ohms (pre-driver stage bias), change R261 and R262 from 100 to 1K ohm, run RV1 wide open (full drive) and then use a compensating capacitor (your 33pf at 14 MHz) across T11 primary with a 1:4 transformer: >? > 6M - 48pf > 10M - 110pf > 20M - 320pf > 40M - 680pf > 80M - 1,500pf > 160M - 4,700pf >? > It shows at least 20 watts out on each band except for 6 meters... where it peaks at 12 watts. >? >? ? ? ? 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: Like us on Facebook! ? ? email:? bill@... ? ?
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From: [email protected] [mailto:[email protected]] On Behalf Of Gordon Gibby
Sent: Saturday, February 17, 2018 6:54 PM
To: [email protected]
Subject: Re: [BITX20] RD16HHF1 in the uBITX #ubitx? ?Dr. Schmidt -- no way to put some feedback into the circuit in some manner to stabilize the gain?? ? 1000 pf across the 22 ohm emitter resistors to have a 3db break at 7 MHz? ? ?
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Re: Would like to sell an unopened BITX40 kit
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Michael Shreeve
Michael Monteith
Carl Beck
Don, ND6T
Arvo W0VRA
K9HZ
_Dave_ AD0B