OK, these instructions for the ssb6.1 are quite good, if a bit daunting.

Written by customers:


http://img.banggood.com/file/products/20160921230039Final-Version-of-SSB6.1-Build-G0CWA.pdf

And the LPF's a lump in your antenna feed.
No bandswitches.

I looked around some on the interwebs, not impressed by the ssb6.1
Be aware that you are buying exciter and ?vfo and linear and lpf's separately.
And that instructions are pretty much non-existent.

Easier and cheaper to take a bitx40v3 from hfsigs, remove the bandpass filter at L1,2,3
and lowpass filter at L6,L7. ?Replace them with plug in modules.

Maybe make the bandpass filter a variable preselector instead:
/g/BITX20/topic/6212787#33783

Then hack Allards code to move the VFO around for the different bands.
Several here have hacked the bitx40v3 for 20 and 80. ?
And lots of bitx kits out there for sale with filters fully described.
??


Or be one of the first to build the ubitx:
/g/BITX20/message/33255
/g/BITX20/topic/4438163
/g/BITX20/message/33953


Jerry

On Thu, Oct 26, 2017 at 04:38 pm, Bruce Bjerke, K7BHB wrote:

I previously had to change from a speaker-mic to a separate speaker and microphone to avoid a big feedback howl for a half a second or so upon transmit. That worked, resulting in only a short "pop" sound. But now with sketch 1.26 the howl is back even with the separate speaker a good distance away from the Mike.

Bruce, I believe the howl is not related to the issue of the carrier burst.
The howl is probably caused by oscillations of the LM386. Not by audio feedback from the speaker to the mic.
The pop from the speaker is caused by the LM386 wich remains powered for at least half a second. In this short period the LM386 may even start to oscillate and produce a howl. Someone (can't remember who, sorry) recommended to add a 1K series resistor to the slider of the volume pot to prevent this.

Is there a hardware mod that has to be implemented to avoid the carrier burst, or lines of code that need to be uncommented?

No additional hardware mod required. No need to uncomment anything in the code.
The code adds only 75ms delay before the VFO signal is generated after PTT is keyed. Definitely much shorter than the length of the howl (half second) you are hearing.

73 Allard PE1NWL

It means you are measuring from one end pin to the other end pin of R136.
The third pin in the middle is best seen from the back of the board.
Measuring from the middle pin to ground should be 0 ohms at minimum drive.
R136 and RV1 are both backwards, minimum setting is fully clockwise.

Typically R136 is parked about midway.
Adjusting it counter-clockwise can increase power out of the IRF510,
but at some point there will be appreciable distortion
causing splatter into adjacent frequencies.

RV1 sets the bias into the IRF510, typically for 100ma of drain current.
You want to be very careful if messing with that, as the active region is small and touchy..
Too far counter-clockwise and the IRF510 is toast.

Jerry, KE7ER

Allard,
I loaded sketch 1.26 today and noticed no change to the carrier burst problem. In fact, it might have been a bit worse if anything.

I previously had to change from a speaker-mic to a separate speaker and microphone to avoid a big feedback howl for a half a second or so upon transmit. That worked, resulting in only a short "pop" sound. But now with sketch 1.26 the howl is back even with the separate speaker a good distance away from the Mike.

Is there a hardware mod that has to be implemented to avoid the carrier burst, or lines of code that need to be uncommented?

Nevertheless, I'm very impressed by and thankful for the many other features and benefits that your sketches have implemented...thank you!

Bruce, K7BHB

R136 measures 97ohms regardless of setting...does this mean anything?

I am also looking for a Multiband hf transceiver kit but with no luck, can anyone out help...

I'm about to buy a bitx20 v3...I would like to know if someone has put 4 line by 20 lcd which has a s-meter in it for the 20 meter...

I'd guess those figures are more like 102ma and 230ma.
And that you are not be including the Raduino in those figures.

You might look over the rest of these links once you've sorted out the above readings.
??/g/BITX20/message/33943

Jerry

Thanks Jerry for correcting my reference for the 100pf mod to the LPF.? I meant no disrespect.? Simple ignorance.

-So I have confirmed that my antenna is wired correctly.? COM to bnc shell, board antenna connected to pin, no continuity between shell and pin.
-I was also able to measure mA (thanks to the patient instruction of Dexter N Muir)

开云体育

I am working on a PCB with that alternate part.? It is in a 20 Pin package.? It has 8 clocks and one address pin.

I have jumpers for the address and the spread spectrum option.

I have made one with the $1 part and like on this one, I put a resistor and then a 10uF cap on each of the clock supply lines.

This should help with current hogging and give the user the ability to increase the resistor for experimenting.

It has its own 3.3V regulator and proper level shifting, so it only takes 5V, Gnd, SDA, and SCL to run.?? It should be able to run along with

the Raduino SI Gen part without much interference.

I attached schematic "LotsaClocks1".?? PCB is almost done.

Mike, WA6ISP

The si5351 costs $1. ?Perhaps use one exclusively for first LO, another for second LO and BFO.
Stuck at same i2c address, but perhaps an analog switch to select one or the other.
Or use one of the other si5351 variants, they have separate vddo pins for each output.

On Thu, Oct 26, 2017 at 01:39 am, Jean-Matthieu F5RCT wrote:?

The most critical will be purity of the first LO. The 57 MHz and the BFO are less critical since the signal is filtered by Xtal filters.

?

-- 
Mike Hagen, WA6ISP
10917 Bryant Street
Yucaipa, Ca. 92399
(909) 918-0058
PayPal ID  "MotDog@..."
Mike@...

Yes, I was wondering about using a needle to get the turns nice and tight. I was also wondering, when they refer to a bifilar winding if you are supposed to make a twisted pair prior to winding on the core, or just wind two parallel wires, or if it makes a difference. Any further info would be helpful before I rewind the core.

Thanks

Brent

The si5351 costs $1. ?Perhaps use one exclusively for first LO, another for second LO and BFO.
Stuck at same i2c address, but perhaps an analog switch to select one or the other.
Or use one of the other si5351 variants, they have separate vddo pins for each output.

On Thu, Oct 26, 2017 at 01:39 am, Jean-Matthieu F5RCT wrote:?

The most critical will be purity of the first LO. The 57 MHz and the BFO are less critical since the signal is filtered by Xtal filters.

?