Re: Sunil Lakhani's AGC board connections to uBITX #ubitx

#61140

This is for the bitx 20 it goes to the base of transistor? Q2 and ground. Altering the gain at the 1st IF transistor.

Is this the board you are refering to?

I am not sure you can use that AGC board on the Ubitx instead I suggest you take a look at

and also

You dont have to fit the RFgain pot on the front panel though, you could just use the suggested AGC circuit.

Either way you will have to break into the track shown.

Hope that helps.

?

----------------------------------------------------------------------------------------------------

May the Morse be with you!

Re: Sunil Lakhani's AGC board connections to uBITX #ubitx

#61139

Jim?

--
John - N0CTL - Fulltime RV in a 40' motorhome

Re: Dummy Load Resistors

#61137

Here is a power resistor I used in another dummy load. These could be an alternative if the ones specified for this project are hard to find.

I used two on a heatsink. Possibility in oil the wattage these can handle would be increased. The small heatsinks attached, while in the oil would likely help.?

Tom, wb6b

Re: Mike element

#61136

Did you mean this one??

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On Sat, Oct 27, 2018, 1:12 PM Frank Dinger , EI7KS <ei7ks.frank@...> wrote:

Chinese on-line retailers sell electrets with external amplifier on a 15x20mm board complete with separate 5 pin header.? This unit seem to be very effective for BITX radios.? Past week? I received 2 pcs .

Frank? ,? EI7KS

Re: SolderSmoke Podcast #207 uBITX 15 Mtrs, 60 mtrs, homebrew, antennas, Cubesats

#61135

Raj, what are the spurs like when running finals at higher voltages. 24v has been suggested.?

Re: Sideband rejection

#61134

Better yet, repeatedly do both steps until no further adjustment is needed.
I have no idea how the two different adjustments might affect each other with the firmware you are using.

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On Mon, Oct 29, 2018 at 09:17 AM, Jerry Gaffke wrote:

I suggest you set the BFO first, then calibrate the rig to be on the correct frequency.

Re: Sideband rejection

#61133

I don't know what firmware you are using or what instructions you are following.
Tuning for zero-beat makes sense to me when calibrating the si5351 reference oscillator
so the rig is on the correct frequency.
But tuning for zero-beat does not make sense when setting the BFO offset with respect to the 12mhz filter.

I don't think many firmware releases calibrate using algorithm of post???/g/BITX20/message/54501
or tune the rig following the algorithm of post??/g/BITX20/message/44278
That being the case, there may be weird dependencies between calibrating and setting the BFO,
I suggest you set the BFO first, then calibrate the rig to be on the correct frequency.

To set the BFO, I suggest you tune in an amateur SSB station, then set the BFO for best received audio.
Ideally, find a station where the operator's voice is similar to your own (low, medium, or high pitched).
When transmitting, the filter will be doing the same thing to your voice as rig does when receiving.

Jerry?

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On Mon, Oct 29, 2018 at 08:55 AM, Matthias Zwoch wrote:

Surely the BFO must be corrected. But how? I followed the instructions, got a AM station with known frequency and set BFO to zero beat.??

Sideband rejection

#61132

After relay change my uBitx 4.3 is now capable for legal CW QSOs. So I did the next step and changed L5,L7 and L1 to 680 / 330 nH.
The first test on SSB via dummyload and 20db extra attenuation direct in the antenna of my good old SDR-IQ shows a rather clean signal in the RF spectrum at 10kHz width - but looking like AM and not like LSB on 3.6 MHz. Test with other stations confirmed that. The carrier is still present and the USB sideband is only 6dB down compared with LSB.
Surely the BFO must be corrected. But how? I followed the instructions, got a AM station with known frequency and set BFO to zero beat. Was then happy, to have a clean reception of all SSB stations on the QRGs where they were spotted.

73 Matthias, DD7NT

Re: Sunil Lakhani's AGC board connections to uBITX #ubitx

#61131

Merci, but no - what I am looking for is NOT in this .rar.

Jim

Re: uBitX CW Sidetone Volume

Marko Pavlicevic

#61130

All this when TX is off!

Re: uBitX CW Sidetone Volume

Marko Pavlicevic

#61129

Raj, I will try this.

Bill... tried that, but when keying the transmitter, I still hear the bumping of Raduino... even if the CW TONE line is grounded.

Re: Sunil Lakhani's AGC board connections to uBITX #ubitx

#61128

Hello

Voici le fichier .rar

73 QRO

F1BFU - Fr

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Le?lun. 29 oct. 2018 à?14:38, Jim Sheldon <w0eb@...> a écrit?:

Thanks Art, I already have that file and the actual schematic with connections shown is NOT in that .rar.? There was another one that got posted somewhere that actually had the connections for IF-1 and IF-2 shown on the AGC schematic but I need to know where those points actually are on a uBITX V4 board.? That's what I cant seem to find.

Jim

--

Gilles - F1BFU/FR

AGC.rar

Re: Sunil Lakhani's AGC board connections to uBITX #ubitx

#61127

Thanks Art, I already have that file and the actual schematic with connections shown is NOT in that .rar.? There was another one that got posted somewhere that actually had the connections for IF-1 and IF-2 shown on the AGC schematic but I need to know where those points actually are on a uBITX V4 board.? That's what I cant seem to find.

Jim

Re: Sunil Lakhani's AGC board connections to uBITX #ubitx

#61126

开云体育

Jim

?

Agc kit file

?

Art N2AJO

?

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From: [email protected] <[email protected]> On Behalf Of Jim Sheldon
Sent: Monday, October 29, 2018 9:00 AM
To: [email protected]
Subject: Re: [BITX20] Sunil Lakhani's AGC board connections to uBITX #ubitx

?

That's not the AGC board, that's the front panel board to one of Sunil's cases.? The AGC board is a separate kit from them.

Jim

Virus-free.

AGC.rar

Re: Sunil Lakhani's AGC board connections to uBITX #ubitx

#61125

That's not the AGC board, that's the front panel board to one of Sunil's cases.? The AGC board is a separate kit from them.

Jim

Re: Sunil Lakhani's AGC board connections to uBITX #ubitx

#61124

开云体育

Jim

/g/BITX20/photo/6439/8?p=Name,,,20,1,0,0

Try

This

Art N2AJO?

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On Oct 29, 2018, at 8:09 AM, Jim Sheldon <w0eb@...> wrote:

Anyone have the schematic that shows how to connect Sunil Lakhani's AGC board kit to the uBITX?? I found a diagram that had all the connections once, and like a dummy forgot to print or save it.? Now, it seems to have disappeared.? It is not in the .rar archive file available on the website.

Any help would be greatly appreciated.? Sunil, if you read this please email me directly w0eb [at] cox dot net.

Thanks,

Jim Sheldon, W0EB

Sunil Lakhani's AGC board connections to uBITX #ubitx

#61123

Anyone have the schematic that shows how to connect Sunil Lakhani's AGC board kit to the uBITX?? I found a diagram that had all the connections once, and like a dummy forgot to print or save it.? Now, it seems to have disappeared.? It is not in the .rar archive file available on the www.amateurradiokits.in website.

Any help would be greatly appreciated.? Sunil, if you read this please email me directly w0eb [at] cox dot net.

Thanks,

Jim Sheldon, W0EB

Re: uBitX CW Sidetone Volume

#61122

Hi,

I installed a small pot (10k) in series with the line into the audio channel from the Raduino. The trace I broke is on the top of uBitx mother board to the right of the Raduino socket (looking at the board from the front). I cut the trace with a hobby knife, scraped the green paint off, and soldered the center and one end of the pot to those leads. The sidetone volume can then be adjusted and mine is down with the level of incoming signals. Make sure the pot (and the cut trace) is far enough to the right to clear the Raduino when it is plugged in.

73,

Bill  KU8H

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On 10/29/2018 05:51 AM, Marko Pavlicevic wrote:
Even after replacing R253 with higher value, CW TONE is still loud.
If I remove R253, I can hear CW TONE in headphones!

Is there a way to implement CW TONE volume control in RADUINO?

-- 
bark less - wag more

Re: uBitX CW Sidetone Volume

#61121

Try a 10K or 1K preset (center and one end) parallel with C252,
this should work with 10K but if not try a 1K preset.

Raj

At 29-10-18, you wrote:

Show quoted text

Even after replacing R253 with higher value, CW TONE is still loud.
If I remove R253, I can hear CW TONE in headphones!

Is there a way to implement CW TONE volume control in RADUINO?

Re: uBitX CW Sidetone Volume

Marko Pavlicevic

#61120

Even after replacing R253 with higher value, CW TONE is still loud.
If I remove R253, I can hear CW TONE in headphones!

Is there a way to implement CW TONE volume control in RADUINO?