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Re: Was Noob in need of some assistance. Now: [BITX20] Input antenna attenuation?

 

That is not static, static is what you hear on a radio not tuned to a station.
Sounds like the cicadas at my farm!

This sounds like a wiring error, probably a ground wire mistake between the Raduino and Bitx40.

Check what happens if you disconnect the VFO from the Raduino board.
Does the noise stop?
Does the display go off? - ground/power supply wiring!

You have put a 10t bourns pot for volume.
The 10T pot has the WIPER at the rear and not the middle as you would expect - check this.
From the front RED-BLACK-BROWN at the bottom as in your video!
I am betting that this is one of the problems! LM386 is finicky amp that starts unstably oscilliating
for the smallest reason!

Raj, vu2zap

At 28-04-2017, you wrote:

Loud static :-( sounds almost like a smps that's given up the ghost?

Re: raduino_v1.08 released

 

First I really like the newest version, saving the mode is a big plus in my opinion. As long as we are discussing writing frequencies to memory, from my viewpoint I don't see the purpose of writing it at all. I would much rather see several "memory channels" instead. Also I think it would be more convenient to have a select-able startup frequency when you power the radio up. Maybe a different startup for each VFO.? I normally always tune to the digital area first before I go looking elsewhere. I would guess many people have a favorite place to look first before tuning around. Also I understand the reasoning behind staying with the "stock" hardware but with the new menus that have been created using an encoder sure would be handy.
Re: Interesting observation of the power levels of the Si5351A, reversed?

 

I looked at the output of the Synthesizer today where it enters the Bitx board with a scope and on mine the output went up as the current increased. I didn't measure anything exactly but it appeared to go up proportionately with the increase in current. On LSB the waveform is more of a square wave but USB is pretty much a sinewave. I should have taken a picture but I didn't think about it.

Jeff

N9ARZ
Re: Bitx qso night

 

I missed tonight didn't think anyone was on. How about we do something at a specific time say Sunday night @ 1:00 UTC??Steve Greer you up for running net logger again? If so what time works? I'll post this to the FB pages once we settle on day/time.
Re: Was Noob in need of some assistance. Now: [BITX20] Input antenna attenuation?

 

Loud static :-( sounds almost like a smps that's given up the ghost?

VIDEO0156.mp4
VIDEO0156.mp4

Re: Was Noob in need of some assistance. Now: [BITX20] Input antenna attenuation?

 

No other receiver is available :( and the static only gets louder during sweeping no tone. just static and louder static.?
Re: raduino_v1.08 released

Jack Purdum
 

Sorry, Allard. I keep forgetting that I'm using a Mega but most are using a Nano...my bad.

Jack, W8TEE


From: Allard PE1NWL <pe1nwl@...>
To: [email protected]
Sent: Thursday, April 27, 2017 5:10 PM
Subject: Re: [BITX20] raduino_v1.08 released

I agree with Jerry's point to keep it simple.
For now I'll stick to the current concept but increase the write interval
to 30 seconds.
We can always add extra features such as "favourite frequencies" later on
(if program space permits, we're already at 70% now).
I believe for the baseline code, RIT/SPLIT functionality has higher
priority now.

73, Allard PE1NWL

On Thu, April 27, 2017 22:45, Jerry Gaffke via Groups.Io wrote:
> My primary suggestion is to keep it simple. ??The easier this baseline
> code is to understand the more people will be able to hack in their
> preferences. ??And learn a little bit of programming in the process.
>
Re: Bitx qso night

 

I heard KC2NUD calling cq shortly after 8pm, he did not hear me. Later I heard KC2NUD talking to W5IFN and hoped to get a relay but W5IFN was in a hurry to go.? Bands were OK, not great. I am trying out a new microphone build so I don't know for sure if it is working.

KC8WBK
Re: BitX 40 issues

 

Hi,

Break up your trouble shooting (Simplify). Dis-Connect Xmit DC Connector and just get receiver going. Dis-connect mic and ptt.

Put the speaker connector directly to a speaker or headphones. Not a connector with switching connections.

So with tuning pot and function switch try getting the radio to tune. You should get noise and the "Birdie" about
7.200? Try to get a signal. Make sure your antenna is not shorted out.

Just a thought?

Keep going, and tell the group the status.

Mike, WA6ISP
Re: Interesting observation of the power levels of the Si5351A, reversed?

 

On 28/04/17 11:00, VK3HN wrote:
I have also fiddled around with si5351 power output levels with
unconvincing results. I am.not able to access my gear for afree days,
can anyone else verify this?
It seems to me that the CLK output is set in mA - the following stage
being a high-impedance (common emitter) buffer, so CLK output changes in
current might not be reflected in the voltage without a lower impedance
termination. The behaviour of that buffer would be preferable for a
crystal oscillator, and otherwise work just fine with the CLK gen..

You could verify it on the 'scope or RF probe.. Busy at work here..

S
BitX 40 issues

 

Greetings


I have about run out of gas. I have tried everything I can think of. My BitX 40 will not work. I have tried everything I can think of with no real success and I am at a total loss as to where to go for help.

When my Mic and PTT are connected there is NO sound in the speaker in receive. When I push the PTT then I hear noise in the speaker. The currents do not match what they are supposed to read for receive vs transmit. When I disconnect my Mic and PTT then I have noise in the speaker but cannot discern any kind of intelligence signals at all.

I am at my wits end here.

On the plus side my Raduno does reflect what appears to be a frequency readout on the 40 meter band.? I have no Idea if this is accurate as I cannot receive any intelligence.
Re: raduino_v1.08 released

 

Thanks Cory,

that's a good idea that we can easily implement. It will help to reduce
the number of unnecessary write cycles.
I'll put this one on my list!

73, Allard PE1NWL

On Fri, April 28, 2017 00:15, Cory Clemmer wrote:
If the frequency hasn't changed for 10 or 20 secs then save it.
Would prevent writing to eeprom while tuning around.
Re: adding VK3YE AGC to BITX40

 

I have just finished building the VK3YE LED-LDR AGC circuit, for an MST-Mk1 (not BiTx40), but a similar rig. ?Write-up and demo video here:?

W0PWE>?It seemed like the AGC circuit was loading the audio coming from the pre-amp a bit so I added a resistor in series with the AGC amp - 33K if I remember correctly. I also tuned the resistor that is in series with the LDR.

I noticed the same thing... connecting the LDR directly to the top of the audio gain control dropped the audio level noticeably with no signal present, so I also added a series resistor, but only about 2k2.

I used a high intensity white LED and a 4k-40k LDR, links in the blog post. ?I'm pleased with this circuit and will use it again. ?

73 from Paul VK3HN.?
Re: Interesting observation of the power levels of the Si5351A, reversed?

 

I have also fiddled around with si5351 power output levels with unconvincing results. I am.not able to access my gear for afree days, can anyone else verify this?
Re: raduino_v1.08 released

 

If the frequency hasn't changed for 10 or 20 secs then save it.
Would prevent writing to eeprom while tuning around.

On Apr 27, 2017 5:18 PM, "Steve Wright" <SteveWrightNZ@...> wrote:
On 28/04/17 08:59, Jack Purdum via Groups.Io wrote:
Would a Supercap have enough juice for a write? I have no clue.

it only needs a few milliseconds..

S
Re: raduino_v1.08 released

 

¿ªÔÆÌåÓý

On 28/04/17 08:59, Jack Purdum via Groups.Io wrote:
Would a Supercap have enough juice for a write? I have no clue.

it only needs a few milliseconds..

S
Re: raduino_v1.08 released

 

I agree with Jerry's point to keep it simple.
For now I'll stick to the current concept but increase the write interval
to 30 seconds.
We can always add extra features such as "favourite frequencies" later on
(if program space permits, we're already at 70% now).
I believe for the baseline code, RIT/SPLIT functionality has higher
priority now.

73, Allard PE1NWL

On Thu, April 27, 2017 22:45, Jerry Gaffke via Groups.Io wrote:
My primary suggestion is to keep it simple. ??The easier this baseline
code is to understand the more people will be able to hack in their
preferences. ??And learn a little bit of programming in the process.
Re: raduino_v1.08 released

Jack Purdum
 

Would a Supercap have enough juice for a write? I have no clue.

Jack, W8TEE


From: Jim Pruitt <jpruitt67@...>
To: [email protected]
Sent: Thursday, April 27, 2017 4:10 PM
Subject: Re: [BITX20] raduino_v1.08 released

I personally would love to see it done this way (write at power off) but
I have to ask if that is practical.? Could we get a reliable write with
power being removed at the same time a write is in progress?? I love the
option of turning the rig on where it was when I turned it off.? I had
an Icom IC720 in the early 80's that always came back on 7100 every time
it was powered up.? I hated that "feature"!

Thank you.

Jim Pruitt

WA7DUY


On 4/27/2017 12:32 PM, Steve Wright wrote:
> Just to be annoying - my suggestion is write only at power-off.? ;)
>
>
> Steve
>
Re: raduino_v1.08 released

 

My primary suggestion is to keep it simple. ?The easier this baseline code is to understand the more people will be able to hack in their preferences. ?And learn a little bit of programming in the process.

If we want to support different options, we could create a much larger and more confusing file with 10 different #ifdef sections to support 10 different ways of handling system state writes to EEPROM, and another 10 for various tuning schemes. ?Etcetera. ?The baseline code without all those #ifdef's could be generated automatically using a python script. ?Probably can't use the C preprocessor, as we don't want to unwrap all the #defines.

Jerry?
Re: raduino_v1.08 released

 

On 28/04/17 08:25, Allard PE1NWL wrote:
Unless someone has a clever idea?
Ah, it was just to be amusing.. BUT maybe someone felt like playing
with two resistors on a spare input pin??? I am too busy climbing radio
towers, and 200 other projects..

Likely the existing regulator capacitor has enough time-constant to keep
the Arduino running for quite a few cycles after switch-off. I do not
know how quick the flash write is..

A resistor-divider off the main power switch onto an input pin will be
without this time-constant, and a good signal to the processor. It may
need to be interrupt-driven, but I think it will be a very fun section
of code to have - powered_off() How fun to be writing code for _after_
the radio is has been switched off!

Steve
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