we get cheaper as well , if we don't need the usb cable.-
On Mon, Dec 31, 2018 at 1:28 PM Bob Lunsford via Groups.Io <nocrud222= [email protected]> wrote: REF:
Arduino Nano's are starting to show up with micro-USB instead of mini-USB connectors.
This makes it much easier to find cables for them.? It also means that they can be powered
with the less-than-a-dollar plug-in chargers from the Dollar Store.
~~~~~~~~~~~~~~~~~~~~~~
When shopping for cables and chargers, check Dollar Tree first. There are some items
such a stereo-to-stereo cables there.
I cut off one end of such a cable and used the cable for the mic...it worked fine.
You only have to Ohm out the connector and wires to make a color translation table
for the correct connection to the mic per the schematic/diagram.The one I used had a
braided outer covering that looked like some of the cables used for earphones
ages ago but it was silver colored. Neat.
Bob ¡ª KK5R
--------------------------------------------
On Sun, 12/30/18, Arv Evans <arvid.evans@...> wrote:
?Subject: Re: [BITX20] nanos on sale at banggood for $2.39 USD #arduino #nano
?To: [email protected]
?Date: Sunday, December 30, 2018, 7:19 PM
?Arduino Nano's
?are starting to show up with micro-USB instead of mini-USB
?connectors.?
?This makes it much
?easier to find cables for them.? It also means that they
?can be powered
?with the
?less-than-a-dollar plug-in chargers from the Dollar
?Store.
?
?These particular Nano's are
?interesting because it appears that they include real
?crystals for
?the 12 MHz USB and
?16 MHz AVR processor.?
?
?
?Arv? K7HKL_._
?On Sun, Dec 30, 2018 at 3:09 PM Woody <mailme@...>
?wrote:
?Reading down the add, it
?appears that it is shipped without a clock
?crystal as well.
?Woody, KZ4AK
?On 12/30/2018 21:50, ag4qc38313 wrote:
?> Well, yes. But then the shipping is $2.50? Not such a
?good deal anymore.
?>
|
REF:
Arduino Nano's are starting to show up with micro-USB instead of mini-USB connectors.
This makes it much easier to find cables for them. It also means that they can be powered
with the less-than-a-dollar plug-in chargers from the Dollar Store.
~~~~~~~~~~~~~~~~~~~~~~
When shopping for cables and chargers, check Dollar Tree first. There are some items
such a stereo-to-stereo cables there.
I cut off one end of such a cable and used the cable for the mic...it worked fine.
You only have to Ohm out the connector and wires to make a color translation table
for the correct connection to the mic per the schematic/diagram.The one I used had a
braided outer covering that looked like some of the cables used for earphones
ages ago but it was silver colored. Neat.
Bob ¡ª KK5R
--------------------------------------------
toggle quoted message
Show quoted text
On Sun, 12/30/18, Arv Evans <arvid.evans@...> wrote: Subject: Re: [BITX20] nanos on sale at banggood for $2.39 USD #arduino #nano To: [email protected] Date: Sunday, December 30, 2018, 7:19 PM Arduino Nano's are starting to show up with micro-USB instead of mini-USB connectors.? This makes it much easier to find cables for them.? It also means that they can be powered with the less-than-a-dollar plug-in chargers from the Dollar Store. These particular Nano's are interesting because it appears that they include real crystals for the 12 MHz USB and 16 MHz AVR processor.? Arv? K7HKL_._ On Sun, Dec 30, 2018 at 3:09 PM Woody <mailme@...> wrote: Reading down the add, it appears that it is shipped without a clock crystal as well. Woody, KZ4AK On 12/30/2018 21:50, ag4qc38313 wrote: > Well, yes. But then the shipping is $2.50? Not such a good deal anymore. >
|
Re: Tracing receive signal for low signal
Outboard af amp probably easiest to implement
Jim
On Sunday, December 30, 2018, 9:24:45 PM PST, Dave Space <davesspacebar@...> wrote:
Still needs work 100uv in is moderately loud but not great yet.? ?So might need some more amplification. Maybe one more transistor might do the trick.
|
REF:
In that case Harvey, you could accomplish the same thing with adding more AF gain. It is not a big deal...... but adding RF gain when you already have detectable antenna noise reduces the dynamic range of the receiver making it more susceptible to overload.
It is somewhat of an "angels on the head of a pin" discussion. Just ignore me..... :-).
WA8TOD
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
I used amplified computer speakers to bring up the received
signals. I put the speakers on full audio and did all volume
adjustment on the radio. What amazed me is that with the
antenna switched to the dummy load on an unused station,
the output from the speakers at full volume on both the radio
and the speakers, there was practically no sound at all which
means the radio is essentially quiet. But when I put the radio
on a known, strong AM broadcast station, there is enough
leakage in the antenna transfer switch to hear the broadcast
station although not very strongly.
i therefore suggest plugging in a set of amplified computer
speakers as an experiment to see if this is enough to increase
the gain of the system to where it is all you need. Also, a good
antenna is essential. I use an 80M G5RV and an MFJ 40M and
up OCFD for most listening and this gives me 80-10M with good
AM broadcast (on the G5RV).
Bob ¡ª KK5R
--------------------------------------------
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Show quoted text
On Sun, 12/30/18, Warren Allgyer <allgyer@...> wrote: Subject: Re: [BITX20] RF Amplifier Added #ubitx To: [email protected] Date: Sunday, December 30, 2018, 12:04 PM In that case Harvey, you could accomplish the same thing with adding more AF gain. It is not a big deal...... but adding RF gain when you already have detectable antenna noise reduces the dynamic range of the receiver making it more susceptible to overload.? It is somewhat of an "angels on the head of a pin" discussion. Just ignore me..... :-). WA8TOD
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Re: Tracing receive signal for low signal
Still needs work 100uv in is moderately loud but not great yet.? ?So might need some more amplification. Maybe one more transistor might do the trick.
|
Re: Need help getting replacement Detention Free Tuning Encoder with Push Button
Jack, Thank you for the speedy reply on my Tuning Encoder info request. ?I will order some first thing tomorrow along with some other parts that I really don¡¯t need but are nice to have on hand.? Really appreciate the assist and the quick response.? Dan. W3BU
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On Dec 30, 2018, at 10:44 PM, Jack Purdum via Groups.Io < jjpurdum@...> wrote:
:
????652-PEC11R-4020F-S24
??? (Mouser #)
??? PEC11R-4020F-S0024??????? (Bourn #)
Jack, W8TEE
On Sunday, December 30, 2018, 10:04:47 PM EST, Dan Schaefer < CLANCY.987@...> wrote:
I am just about finished putting together my ubitx radio.? As I was doing the final assembly I noticed the tuning encoder on the floor looking significantly worse than original condition. I looked it over and cleaned up the connector misalignments but am not sure it is still working.
Would like to get some replacements but don¡¯t know the part number or where to order it from.? Help Please ?
I completed the assembly using the encoder I have ans fired up the unit.? Display comes up with the 7150 frequency but can¡¯t tune the radio or go to different setups by pushing the encoder.? The receiver seems to be working on the one frequency but can¡¯t do anything else with it. Haven¡¯t had any time to investigate yet but am open for suggestions.? Tx keys but no power out as yet.
Would like to quickly get a new encoder just in case it is my only problem. But wouldn¡¯t be surprised if I missed other things.? Am wondering if I might be missing a ground on the encoder ?
It¡¯s been fun doing the radio (v4) but am now anxious to get it working.
Thanks All
Dan. W3BU
|
Re: Need help getting replacement Detention Free Tuning Encoder with Push Button
Mouser.com:
????652-PEC11R-4020F-S24
??? (Mouser #)
??? PEC11R-4020F-S0024??????? (Bourn #)
Jack, W8TEE
On Sunday, December 30, 2018, 10:04:47 PM EST, Dan Schaefer <CLANCY.987@...> wrote:
I am just about finished putting together my ubitx radio.? As I was doing the final assembly I noticed the tuning encoder on the floor looking significantly worse than original condition. I looked it over and cleaned up the connector misalignments but am not sure it is still working.
Would like to get some replacements but don¡¯t know the part number or where to order it from.? Help Please ?
I completed the assembly using the encoder I have ans fired up the unit.? Display comes up with the 7150 frequency but can¡¯t tune the radio or go to different setups by pushing the encoder.? The receiver seems to be working on the one frequency but can¡¯t do anything else with it. Haven¡¯t had any time to investigate yet but am open for suggestions.? Tx keys but no power out as yet.
Would like to quickly get a new encoder just in case it is my only problem. But wouldn¡¯t be surprised if I missed other things.? Am wondering if I might be missing a ground on the encoder ?
It¡¯s been fun doing the radio (v4) but am now anxious to get it working.
Thanks All
Dan. W3BU
|
Need help getting replacement Detention Free Tuning Encoder with Push Button
I am just about finished putting together my ubitx radio. As I was doing the final assembly I noticed the tuning encoder on the floor looking significantly worse than original condition. I looked it over and cleaned up the connector misalignments but am not sure it is still working.
Would like to get some replacements but don¡¯t know the part number or where to order it from. Help Please ?
I completed the assembly using the encoder I have ans fired up the unit. Display comes up with the 7150 frequency but can¡¯t tune the radio or go to different setups by pushing the encoder. The receiver seems to be working on the one frequency but can¡¯t do anything else with it. Haven¡¯t had any time to investigate yet but am open for suggestions. Tx keys but no power out as yet.
Would like to quickly get a new encoder just in case it is my only problem. But wouldn¡¯t be surprised if I missed other things. Am wondering if I might be missing a ground on the encoder ?
It¡¯s been fun doing the radio (v4) but am now anxious to get it working.
Thanks All
Dan. W3BU
|
Re: Tracing receive signal for low signal
I had trouble getting Q70 to work better with base to ground resistors.? Probably need to play with the collector resistor a bit more to get the right voltage.
I decided to give an RF pre-amp a try and cut the receive line from K3 to K1 like many of the AGC circuits I've seen use and just inserted a two transistor npn 2n3904 common emitter amplifiers and now with a good antenna it sounds great. (I prototyped it on a breadboard I have to get the collector/base voltages a little better but other than that seems to work pretty well.)? Once I get that stabilized I create a board to solder everything together.
The signal is so loud now I've got the earbuds plugged in on the other side of the room and I can hear someone loudly talking now :)
I guess the pre-amp overcomes the low signal enough to solve it.? I need to do some bench testing with a 50uV signal and see how it does now.
|
I've used their Nanos before with good results.? If you buy em in bulk (5 or 10) they're always this cheap with minimal shipping costs.
Speaking?of which, since we in the US are no longer going to subsidize Chinese mailing costs (which is why they have been able to ship stuff to the US for such low charges) , look for all Chinese supplier shipping to go up.?
John
|
Arduino Nano's are starting to show up with micro-USB instead of mini-USB connectors.?
This makes it much easier to find cables for them.? It also means that they can be powered
with the less-than-a-dollar plug-in chargers from the Dollar Store.
These particular Nano's are interesting because it appears that they include real crystals for
the 12 MHz USB and 16 MHz AVR processor.?
Arv? K7HKL _._
On Sun, Dec 30, 2018 at 3:09 PM Woody < mailme@...> wrote: Reading down the add, it appears that it is shipped without a clock
crystal as well.
Woody, KZ4AK
On 12/30/2018 21:50, ag4qc38313 wrote:
> Well, yes. But then the shipping is $2.50? Not such a good deal anymore.
> _._,_._,_
>
--
|
I am looking for clear diagrams for two wiring scenarios. One is to wire the bottom two connections of the volume pot to function as the on/off switch. The other is to woie an independent on off switch (for a 3D printed enclosure).
Thanks for helping.
Bob NZ2Z
|
you can select free standard shipping from the CN warehouse  --
|
Re: Advantages and disadvantages of various modes on vhf/uhf
On Sun, Dec 30, 2018 at 06:19 AM, w7hd.rh wrote:
FM has the advantage of less noise when active and can be used on repeaters.?
Almost right.? The FM advantage is detection is unhindered by signal strength until
noise overrides the signal.? Usual case examples is SSB or AM is not as loud when
weaker as they are amplitude based.
Yes, if your FM signal is strong enough its almost always copied. However it also eats
15khz of bandwidth!? If we go to commercial 2.5 or 1.25 deviation the noise advantage
is somewhat lost to the low modulation index.? The wide bandwidth could easily accommodate
five SSB signals, more than 200 CW ops and easily 20 PSK31.
Also most repeaters are used in the primary contour where signal are generally good
with decent radio and antenna.? ?At the edges or at low power not so much.?
Here we have terrain so a repeater area for a really good site is maybe a 20 mile radius?
with bad areas due to terrain shading.? To cover 100 miles here we need Echolink/IRLP
or 80m NVIS, the latter is just a SSB radi with a low dipole at maybe 10FT.
Actual use is not always theory its more what works there.
Allison
|
Re: Advantages and disadvantages of various modes on vhf/uhf
On Sun, Dec 30, 2018 at 06:19 AM, w7hd.rh wrote:
Keep in mind that SSB and CW have a 6dB advantage over all other modes.? They are highly preferred for satellite and moonbounce contacts, and often can be used for relatively local contacts, as
Incorrect.? CW has a 6-10db advantage over SSB and SSB beats am by about as much.? However the slow
digital modes oten beat CW by at least 20DB and sometimes more.
the Band width avantage is log10(BW) where AM is about 10khz and Digital is near 1-2hz a
5000-10000:1 advantage (10,000= 40DB).? So every time you narrow the detection bandwidth?
by 1/10 you gain 10DB till you hit practical physics limits (KTB).? The trade is effective data or
communications speed (voice forces a 2khz bandwidth more or less) goes down as well.
Allison
|
Re: Ideas for homebrew rig for digital modes on VHF/UHF
Curt,
Why even both with uBitx as your designing a one of and can do it more directly for the bands of interest.
The real problem is Synth for LO and power amps as at those frequencies they aren't cheap and 3904s
don't cut it so you looking at vhf and uhf specific LDMOS fets and decent RX LNA.??
Test gear for that is a must or its going to be a long hard haul.? ?Low cost is possible using SDR/IQ systems
analog forget it. Building power say 5-20W will be 1$ watt+ 100$ entry fee.? Everything will require two
sided boards and SMT layout and boxes (shielding) for best possible performance.? Lots of SMA and
quality cables.? IF you hack it together then it is a dial in each one in and hope it stays working.
Of course that eliminates the L band birds as cheap.
Allison
|
Re: Ideas for homebrew rig for digital modes on VHF/UHF
Thanks Jerry. I'll look into those as well.
|
Re: Ideas for homebrew rig for digital modes on VHF/UHF
Dual TX and RX is a lot of circuits but fairly simple SSB.? Untill you hit 435 and 145mhz then it
gets complicated and amps for that are never cheap even at the 10W level.
The bigger thing is you need both TX and RX for both bands as some sats are 435 up
and other are 435 down.? Then a fancy VFO system that will tune about 3x faster for 435
than 145 to keep in the translator as doppler shift happens.? Non trivial.
The FM birds a pair of 5W dual band HTs with headphones and hand mic That and a
hand held dual band yagi and your off to the races.? I've worked AO27 and AO50,
and So50 that way. easy and fun.
Allison
|
I ordered a boatload of them to go with the Raduino Clone kits I have to offer. ?Shipping to US from China warehouse was $1.40 US so I don't see where that would even present a problem. ?That was for AirMail shipping and I ordered 25 of them.
Jim, W0EB
------ Original Message ------
Sent: 12/30/2018 4:38:57 PM
Subject: Re: [BITX20] nanos on sale at banggood for $2.39 USD #arduino #nano
This is because the CH340G serial chip has a build in Chrystal.
it looks to me that this Banggood offer is not that cheap for US customers. No free shipping from CN warehouse. To get free shipping you have to choose delivery from US warehouse, but then the price is more than 5$.
I think you will find better offers at Aliexpress.
73 de Armin, DJ2AG
|
Re: Ideas for homebrew rig for digital modes on VHF/UHF
I had one amazing contact on 10m. I suspect it was gray line propagation. Im pretty sure it was ssb and I worked Tampa Florida to Australia.?
Might have been TEP, transequatorial with Gray line enhancement. IT could also be sporatic E. CW is hard ot obsolete as you you need is an oscillator and a key.? Can't do that simple with any other mode!
Allison
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Bob Lunsford
Jim Sheldon