Date   
Re: Low mic gain, was, show your mic

_Dave_ K0MBT
 

My bitx40 really improved when I put a replacement mic in it. One day I was not getting any signal out of the transmitter. Tracked it back to the mic which was dead. Originally it worked for a month. The replacement seems stronger. 

Re: Erratic tuning with my new uBitx

Nikos SV1IYF
 

Hi Chris,

It surely sounds like a frequency calibration problem, but it is also uncertain as to which piece of equipment contributes more to the error, i.e. the μBITX or your frequency counter,.
Unless your frequency counter has a high precision reference like a GPS disciplined time base, or at least, a TCXO of recent vintage (crystals age), my suspicions would fall on them both.

What I would do:

1) Use the calibration tool of WSJT-x to check my μBITX against a frequency/time standard station at the highest frequency I could get a clean signal from (14.996 MHz here from the Russian station). Note down the offset.

2) Do the same as in 1), but this time using my other rig in TX mode as a frequency generator and adjusting the dial frequency as to get the same offset as in 1).

3) The scope of  step 2) is to establish a local frequency source of suitable power to be measured by the frequency counter, thing to be done here.

4) By now I would have 3 numbers:

a) The dial frequency of μBITX

b) The offset of WSJT-x calibration tool

c) The indication of the frequency counter

Enough information to allocate both (?) frequency offsets.

 

73 Nikos SV1IYF


Re: BITX QSO Afternoon/Evening, Sunday, April 22, 3PM & 7PM Local Time, 7277 kHz in North America, 7177 kHz elsewhere.

John P
 

Hearing someone on 7277, but can't make out a call. Lots of QRN here tonight.
--
John - WA2FZW

Rectifier fuse crowbar. #ubitx

Lee
 

I am using 2 fuses. One for the output transistors and one for everything else.  I was thinking of using one 6 amp rectifier that points in the direction of the power switch and then a wire from the power switch back to power each fuse.  It won't crowbar the fuse with wrong polarity but just stop current flow.  Voltage drop should be around .5 to .7 volts.  I could always parallel 2 of them to cut the voltage drop to 1/2.  What do you think?

Re: BITX QSO Afternoon/Evening, Sunday, April 22, 3PM & 7PM Local Time, 7277 kHz in North America, 7177 kHz elsewhere.

Matthew S <Rigamurow@...>
 

Hearing someone call sign ending in THR.  Also hear a NE Missouri station from here in WV.


On Sun, Apr 22, 2018 at 7:08 PM John P <j.m.price@...> wrote:
Hearing someone on 7277, but can't make out a call. Lots of QRN here tonight.
--
John - WA2FZW

Re: BITX QSO Afternoon/Evening, Sunday, April 22, 3PM & 7PM Local Time, 7277 kHz in North America, 7177 kHz elsewhere.

tony.vasile@...
 

The band seems to be pretty good right now, but I couldn't make anyone out on 7277.  I called on 7277 and 7177 several times, both at 7:20 PM ET and at 7:35 PM ET.

Tony KB9A

On Sun, Apr 22, 2018, 7:08 PM John P <j.m.price@...> wrote:
Hearing someone on 7277, but can't make out a call. Lots of QRN here tonight.
--
John - WA2FZW

I heard...

Jack, W8TEE
 

Heard Glen KE0NXP talking with WA4THR, both were 5x7. I think I heard VE3THR, but kinda down in the mud.

I didn't jump in because my BITX is in pieces on the bench.

Jack, W8TEE

Re: BITX QSO Afternoon/Evening, Sunday, April 22, 3PM & 7PM Local Time, 7277 kHz in North America, 7177 kHz elsewhere.

John P
 

The only station i could really hear well tonight was Tom. I could hear some of the other stations on and off but I had an S9 noise level here tonight. Was using the FT-891 again tonight running 10 watts. Hopefully I'll get the BitX-40 back on the air by next weekend. 
--
John - WA2FZW

uBitx Relay K3 Pins 1 and 5 Location

alans77@...
 

Can anyone provide a picture on the location of K3 pins 1 and 5 on the circuit board? The schematic pin numbers do not match the manufacturers data sheet.
73,
N4AYE

Re: uBitx Relay K3 Pins 1 and 5 Location

AA9GG
 

Take a look at the attached pic.  I had the same issue on my BITX40.

Virus-free. www.avast.com

On Sun, Apr 22, 2018 at 7:05 PM, alans77 via Groups.Io <alans77@...> wrote:
Can anyone provide a picture on the location of K3 pins 1 and 5 on the circuit board? The schematic pin numbers do not match the manufacturers data sheet.
73,
N4AYE




--
Paul Mateer, AA9GG
Elan Engineering Corp.
www.elanengr.com
NAQCC 3123, SKCC 4628

Re: BITX QSO Afternoon/Evening, Sunday, April 22, 3PM & 7PM Local Time, 7277 kHz in North America, 7177 kHz elsewhere.

Doug W
 

Fought through the noise and made one QSO with VE3THR Tom.   That's 2 weeks in a row. 

Re: Teensy 3.5/3.6 upgrade for uBITX

freefuel@...
 

Hi Jim, 

what are your thoughts on doing the same with the Raspberry Pi Zero boards? in some areas such as my own they can be purchased for as little as $5 USD. 

-Justin N2TOH

P.S. I should find the most effective place to ask about an Arduino IDE add on for the Pi boards so they might function as an Arduino alike board. 

Re: BITX QSO Afternoon/Evening, Sunday, April 22, 3PM & 7PM Local Time, 7277 kHz in North America, 7177 kHz elsewhere.

alphaindia4oscartango
 

I was mobile in Northern Virginia and worked a bitx station in Missouri at about 7pm but there was strong qsb as he was very strong then quickly went down to barely readable.
72/73 de Chas ai4ot

Re: Rectifier fuse crowbar. #ubitx

Paul Smith
 

The diodes in parallel will up the current capacity but volt drop won't change much. Using schottky diodes will give the lower voltage drop you need.
Paul ZS2OE

Re: Teensy 3.5/3.6 upgrade for uBITX

Jim Sheldon
 

I don't really have a clue regarding the Pi Zero.  I do know the Pi Zero is faster, with a bit more RAM.  I don't think it would easily replace a NANO, and wouldn't interface easily to the uBITX.  Not saying it can't be done, but someone other than our group will have to be the guinea pigs on that one LOL.

JIM

On Apr 22, 2018, at 7:28 PM, freefuel@... wrote:

Hi Jim, 

what are your thoughts on doing the same with the Raspberry Pi Zero boards? in some areas such as my own they can be purchased for as little as $5 USD. 

-Justin N2TOH

P.S. I should find the most effective place to ask about an Arduino IDE add on for the Pi boards so they might function as an Arduino alike board. 

Re: BITX QSO Afternoon/Evening, Sunday, April 22, 3PM & 7PM Local Time, 7277 kHz in North America, 7177 kHz elsewhere.

Daniel Conklin
 

I could hear N4AEI, N2HTT, WI1B, and N4DR. There was also a KE0NEP, but I'm not sure I got the call right.  I asked for a relay to check in and someone heard me, but then some kind of loud buzzing covered everything up.
Dan W2DLC

Re: BITX QSO Afternoon/Evening, Sunday, April 22, 3PM & 7PM Local Time, 7277 kHz in North America, 7177 kHz elsewhere.

Bruce MacKinnon KC1FSZ
 

I was only on for a few minutes, but Tom VE3THR was booming in here in MA. 

I worked him on my newly QRO'd station with 20W.  Bill N2CQR was kind enough to include the latest update on his blog: http://soldersmoke.blogspot.com/2018/04/kc1fszs-above-board-al-fresco-free.html

73s,
Bruce KC1FSZ https://www.qrz.com/lookup/kc1fsz





Re: Teensy 3.5/3.6 upgrade for uBITX

freefuel@...
 

at times I have wondered at what point has a person reached too many adapter boards, and should really consider a fresh start.  As you already stated about interfacing the Si5351A chip and the Raspberry pi board, they are after all both 3.3 volt IO devices.

-Justin N2TOH 

Re: Teensy 3.5/3.6 upgrade for uBITX

Jack, W8TEE
 

I'd consider why the Zero sells for $5. I think the biggest issue is that the Pi is a different animal than the Arduino family. First, it does not have a home in the Arduino IDE, where most of the µBITX work is being done. Second, it doesn't have the depth of add-ons that the Arduinos do. Those that do exist seem to be more expensive. Third, most of the work on Pi is either done in scripting languages or Python, neither of which is popular on the Arduino.

If you need more horsepower, consider the Protoneer (eBay 282786290858). It has 256K of flash, 32K of SRAM (HUGE benefit), and is clocked 3x faster than the Nano at a cost of $15. It looks very promising.

Jack, W8TEE


On Sunday, April 22, 2018, 8:45:16 PM EDT, Jim Sheldon <w0eb@...> wrote:


I don't really have a clue regarding the Pi Zero.  I do know the Pi Zero is faster, with a bit more RAM.  I don't think it would easily replace a NANO, and wouldn't interface easily to the uBITX.  Not saying it can't be done, but someone other than our group will have to be the guinea pigs on that one LOL.

JIM

On Apr 22, 2018, at 7:28 PM, freefuel@... wrote:

Hi Jim, 

what are your thoughts on doing the same with the Raspberry Pi Zero boards? in some areas such as my own they can be purchased for as little as $5 USD. 

-Justin N2TOH

P.S. I should find the most effective place to ask about an Arduino IDE add on for the Pi boards so they might function as an Arduino alike board. 

Re: BITX QSO Afternoon/Evening, Sunday, April 22, 3PM & 7PM Local Time, 7277 kHz in North America, 7177 kHz elsewhere.

John Pieper
 

Not bad here this evening in Iowa. Worked KG5WLO, Ralph, VE3THR, Tom, and WS4JM, Jay. Also heard earlier WA3O, KE0NXP, WA4THR, and AC9RZ.

Used my uBITX with my half-wave (mostly) vertical wire.

John AD0RW