Date   

Re: A steal for Arduino Experimenters

GM4CID
 

Agree this kit is an excellent starter but, the Uno does not have A6 & A7 ports, the Nano does have A6 & A7.

Also if buying a Nano from China be aware there are two versions, the Nano V3.0 with the ATmega328P processor and the Nano with the ATmega168. The ATmega168 version does not have enough memory to run the various Raduino sketches.


Re: mono band 2 meters rig based on the micro BITx circuit #ubitx #2meters

Dave Bottom <ars.kd6az@...>
 

I think it would be a great project. In the ‘60s I built a solid state 2M transverter and it only had 100mW output but I worked 500 miles regularly with my little Skelton slot antenna. A sad story that another Ham stole my 100W Motorola rig I was going to turn into a linear amplifier but a couple of hand held 2M SSB rigs would be a blast.

I did build two 2M AM handhelds using the basic concept of the CQ Ham Tip rig (Superregen IF) and common audio for both RX/TX but with transistors (6 if I remember correctly). They were great for playing with VHF/UHF antennas while I waited for the opportunity to take the train to Customs House in San Francisco to take my General exam.

Dave WI6R ex-WB6BDA

On Apr 26, 2018, at 6:13 PM, Tim Gorman <tgorman2@cox.net> wrote:

I wouldn't even care about AM. AM operation greatly increases the
complexity of thermal design. SSB would be all I would want -
especially with a good receiver!

tim ab0wr

On Thu, 26 Apr 2018 16:00:38 -0500
"Ken Hansen" <ken@n2vip.org> wrote:

I understand the motivation, but the Chinese are mass-producing dual
band HTs for less than $30 delivered to your door, and the Japanese
are producing higher-quality units starting at about $120, how much
of a premium over these off-the-shelf solutions are you willing to
pay to build your own VHF radio? Are you hoping for SSB operation or
FM?

Personally, I'd love to see an extremely simple version of the old
Heathkit Two'er lunchbox that handles either SSB or AM on 2 Meters
for under $40 all-in, as a fun club build, but I suspect I'm alone on
that desire...

I think it would be fun to have a local net based on low-cost radios
and antennas so small no HOA could object to.

Ken, N2VIP

On Apr 26, 2018, at 3:44 PM, freefuel@gmail.com wrote:

my attention has turned to building a single band rig for 2 meters
and I am curious who might also be interested in such a device. my
initial plan is to build the main circuit board the identical size
of the uBITX and later reduce it to within the confines of the
common 20 by 4 line LCD character display. in an attempt to build
this as a Handi Talkie rig.

-Justin N2TOH


Re: ND6T AGC implementation for uBIT-X

Ion Petroianu, VA3NOI
 

Just to let everyone know I have uploaded a BOM for the TH version, using Tayda Electronics as supplier. 
The files are still on my cloud drive:
https://app.box.com/s/qf4jubi8942dhwdc8lhivctycnue4f12
Design had been done with Eagle 7.5 freeware.
The zip file in the Gerbers Folders is the zip you should upload to the PCB manufacturing house.

The boards are 1 square inch in surface. You can place 10 boards on a 100X100 mm panel and get 10 panels for $5 plus shipping.
For kitting I think SMT version is better and I expect also better performance on upper bands.

73
Ion

VA3NOI


Re: For those keeping track of uBITX shipping times #ubitx

Jim Sheldon
 

Forgot to mention, it's serial # 133/5  so they must be in the 5th batch now.  It does have a socketed UTC audio chip.

W0EB


Re: For those keeping track of uBITX shipping times #ubitx

Jim Sheldon
 

12:31 Central US Daylight time, DHL courier handed me the package!  It don't get much better than that!

Jim - W0EB


Re: D104 microphone #ubitx

Jim Strohm
 

The ubitx wants to see a low-impedance drive from the mic, comparable to a 600 ohm impedance or thereabouts.  The D-104 crystal element presents a 50K ohm impedance, and the amplified D-104 presents an unmatched impedance that's not really compatible with any 600 ohm that a low-impedance audio input wants to see, except that the amp typically overdrives to the point that something works.

A 50K - 600 ohm audio transformer between the D-104 and the ubitx would probably straighten nearly everything out.  A 1000 - 8 ohm audio transformer stripped out of an old pocket transistor radio or CB would probably be close enough.

This is one of those things where it's probably easier to experiment a little than to work out the mathematics. 

Oh yeah -- if the D-104 has its original crystal element, is it still good?  And since most BITX models can be wired for an electret mic, have you put a DC blocking cap in the mic audio like to the D-104?  Eihter of those will cause a D-104 not to work as intended.

73
Jim N6OTQ


Re: New uBITX Raduino (never used) For Sale #ubitx

Jim Sheldon
 

The Raduino has been spoken for.  There may be another one available (same deal) early next week and I'll post that if it happens.

Jim - W0EB

------ Original Message ------
From: "Jim Sheldon" <w0eb@...>
Sent: 4/27/2018 11:17:50 AM
Subject: [BITX20] New uBITX Raduino (never used) For Sale #ubitx

I have a never used Raduino from a Micro BITX (not a BITX40) complete with display just as it came in the box from India.  $30 US plus shipping ($8.00 US, $15.00 International).

Please "reply to sender", NOT to the list if interested and the first off list replay saying "I'll take it" by date time on the email will get first crack at it USD $38 shipped in the U.S., $45 shipped international.

Don't paypal any money until after you contact me off the list and I tell you "It's Yours".  Right now, I only have one but should have a 2nd one by the first of the week that may be up for sale as well.

Thanks,
Jim Sheldon - W0EB  w0eb (at) cox dot net


New uBITX Raduino (never used) For Sale #ubitx

Jim Sheldon
 

I have a never used Raduino from a Micro BITX (not a BITX40) complete with display just as it came in the box from India.  $30 US plus shipping ($8.00 US, $15.00 International).

Please "reply to sender", NOT to the list if interested and the first off list replay saying "I'll take it" by date time on the email will get first crack at it USD $38 shipped in the U.S., $45 shipped international.

Don't paypal any money until after you contact me off the list and I tell you "It's Yours".  Right now, I only have one but should have a 2nd one by the first of the week that may be up for sale as well.

Thanks,
Jim Sheldon - W0EB  w0eb (at) cox dot net


Re: For those keeping track of uBITX shipping times #ubitx

chris gress <Chrisg0wfh@...>
 

My ubix is still MIA  ordered 26/03 no trace of it been shipped still waiting for it to be sorted out :(


On Fri, 27 Apr 2018, 15:39 , <john@...> wrote:
Yes indeed. Mine must have been in there right along with yours. It made it to Romulus Michigan this morning and is now out for delivery. 


Re: ND6T AGC implementation for uBIT-X

Kees T
 

I can do anything with the shear.....still waiting for the dust to settle on this overall design.

Just bought a qty of NXP 2N7002P parts.

73 Kees K5BCQ


Re: ND6T AGC implementation for uBIT-X

Jerry Gaffke
 

Snap it across a row of unplated holes.

Fri, Apr 27, 2018 at 07:44 am, Jerry Gaffke wrote:

have the builder nip the PC board into two pieces to reduce fab costs.


Re: ND6T AGC implementation for uBIT-X

Ken
 

I'd also like to see the same.

73

Ken VA3ABN

On Fri, Apr 27, 2018 at 10:44 AM, Jerry Gaffke via Groups.Io <jgaffke@...> wrote:
AGC and Pop fix want to be in different regions of the board,
and they are both operating on low level signals.
They might agree to be in the the same envelope.
Perhaps have the builder nip the PC board into two pieces to reduce fab costs.

Jerry

On Thu, Apr 26, 2018 at 10:18 pm, Jerry Gaffke wrote:
Would be worth an extra buck if it included a pop fix such as this:
    http://ubitx.net/2018/03/05/updated-circuit-from-va7at-for-removing-audio-pops/



Re: ND6T AGC implementation for uBIT-X

Jerry Gaffke
 

AGC and Pop fix want to be in different regions of the board,
and they are both operating on low level signals.
They might agree to be in the the same envelope.
Perhaps have the builder nip the PC board into two pieces to reduce fab costs.

Jerry


On Thu, Apr 26, 2018 at 10:18 pm, Jerry Gaffke wrote:
Would be worth an extra buck if it included a pop fix such as this:
    http://ubitx.net/2018/03/05/updated-circuit-from-va7at-for-removing-audio-pops/


Re: For those keeping track of uBITX shipping times #ubitx

john@...
 

Yes indeed. Mine must have been in there right along with yours. It made it to Romulus Michigan this morning and is now out for delivery. 


Re: No PTT

Geoff Theasby <geofftheasby@...>
 

Hi both,

4.7k pullup resistors fitted to Raduino board as instructed. There is now 5 volts at the encoder pins A & B, which varies 0-5-0-5-0 as the tuning knob is turned. This makes no difference, the display does not change.

I will order a Nano or two, just in case.

I shall be out of touch for a couple of days, be back then.

Geoff

On 27 April 2018 at 12:07, John <vk2eta@...> wrote:
Hello Geoff,

Here is the beta version of the Diagnostic Software. It should at least get you started. Some instructions are in the README.MD file in the top directory.

Only main menu items 1 and 2 are implemented at this stage (core I2C tests and Analog I/Os).

I need to write a manual for this but I have been too busy coding it so that you could assess your Arduino..hihi

The main menu number 2 (Analogue inputs), brings a second level menu for testing the encoder inputs, the push button, the PTT, the Keyer and the spare analogue input.

Results are displayed in a horizontal bar graph with a scale from 0 to 5V representing the value read by the inputs. That way you can see how it matches the values your voltmeter indicates on the respective pin.

Results are shown only on changes to the values read, for example when rotating the encoder, pushing the PTT or the encoder push-button etc...

If no results are shown then your Arduino cannot read analogue inputs and it would mean plan-B unfortunately.

Let me know how you go with it.

All the best,

73, John (VK2ETA)



A steal for Arduino Experimenters

Jack, W8TEE
 

I just saw this ad from Banggood for $22:


Re: Ubitx average SSB output

Howard Fidel
 

1K. Change one or the other, not both.

On 4/27/2018 10:14 AM, iz oos wrote:

If R63=24ohm what value should R65 be?


Il 27/apr/2018 16:03, "Skip Davis via Groups.Io" <skipnc9o=yahoo.com@groups.io> ha scritto:
Howard did you also change out R65 that was posted here too.
By the way the parts showed up here yesterday, thanks a lot. Now to find time to install them.

Skip Davis, NC9O 

On Apr 27, 2018, at 09:57, Howard Fidel <sonic1@...> wrote:

Yes. Change R63 to 24 ohms. The earlier rev boards had 100 ohms there, and V3 has 47. I put another 47 ohm resistor in parallel with the one on the board. Now I don't need to yell into the mic.

Howard WB2VXW


On 4/27/2018 3:22 AM, iz oos wrote:

I have checked SSB output for the Ubitx using a Softrock sdr receiver. The carrier is well aligned and the filter gives a very good shape. Whistling is gives full output with the stock mic element. The output seems clean but the average power during normal speech seems to me a bit low. Is there an easy way to increase it? 73, Franco




Re: Ubitx average SSB output

iz oos
 

If R63=24ohm what value should R65 be?


Il 27/apr/2018 16:03, "Skip Davis via Groups.Io" <skipnc9o=yahoo.com@groups.io> ha scritto:
Howard did you also change out R65 that was posted here too.
By the way the parts showed up here yesterday, thanks a lot. Now to find time to install them.

Skip Davis, NC9O 

On Apr 27, 2018, at 09:57, Howard Fidel <sonic1@...> wrote:

Yes. Change R63 to 24 ohms. The earlier rev boards had 100 ohms there, and V3 has 47. I put another 47 ohm resistor in parallel with the one on the board. Now I don't need to yell into the mic.

Howard WB2VXW


On 4/27/2018 3:22 AM, iz oos wrote:

I have checked SSB output for the Ubitx using a Softrock sdr receiver. The carrier is well aligned and the filter gives a very good shape. Whistling is gives full output with the stock mic element. The output seems clean but the average power during normal speech seems to me a bit low. Is there an easy way to increase it? 73, Franco



Re: Ubitx average SSB output

Howard Fidel
 

Skip:
I didn't touch R65. Changing its value changes the DC operating point at the collector of Q6. R63 has almost no effect on that, since the current is set mostly by R64 which is bypassed for audio.
Looking closer at the circuit, it is Ok to change R65 to 2K and get the same result since the DC operating point will move down from about 10V to 8V. It is easier thought to do the rework by tacking a resistor across R63 rather then removing and replacing R65. Either way works.

Howard WB2VXW

On 4/27/2018 10:03 AM, Skip Davis via Groups.Io wrote:
Howard did you also change out R65 that was posted here too.
By the way the parts showed up here yesterday, thanks a lot. Now to find time to install them.

Skip Davis, NC9O 

On Apr 27, 2018, at 09:57, Howard Fidel <sonic1@...> wrote:

Yes. Change R63 to 24 ohms. The earlier rev boards had 100 ohms there, and V3 has 47. I put another 47 ohm resistor in parallel with the one on the board. Now I don't need to yell into the mic.

Howard WB2VXW


On 4/27/2018 3:22 AM, iz oos wrote:

I have checked SSB output for the Ubitx using a Softrock sdr receiver. The carrier is well aligned and the filter gives a very good shape. Whistling is gives full output with the stock mic element. The output seems clean but the average power during normal speech seems to me a bit low. Is there an easy way to increase it? 73, Franco




Re: Ubitx average SSB output

Howard Fidel
 

I recently ordered a MAX9814 mic preamp board with AGC. on eBay for $3.32. I will post about how it works after I get it and test it.

Howard WB2VXW

On 4/27/2018 9:36 AM, iz oos wrote:

External audio processor or is there a way to adjust it in the Ubitx? 73 Franco


Il 27/apr/2018 15:19, "Lawrence Galea" <9h1avlaw@...> ha scritto:
Audio processor

On Fri, Apr 27, 2018 at 9:22 AM, iz oos <and2oosiz2@...> wrote:

I have checked SSB output for the Ubitx using a Softrock sdr receiver. The carrier is well aligned and the filter gives a very good shape. Whistling is gives full output with the stock mic element. The output seems clean but the average power during normal speech seems to me a bit low. Is there an easy way to increase it? 73, Franco