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TUNE signal for tuning tuners
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kg9hfrank@gmail.com
This past weekend, I went back in time and reviewd posts back to 2018.
About half way through I started taking notes but... I did not take any notes on how to unbalance the balanced modular to get a signal out for using a tuner. Anyone have that info available? If I recall the ham disabled a resistor causing an imbalance and a steady signal came out which he used to tune his tuner. He turned it on and off with a toggle switch. -- Frank, KG9H
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Simple way is to use the Manual Key option and CW mode to use the PTT for a +/-10W CW signal that will tell the tuner what frequency to center on for tuning. Maybe someone else can suggest a hard-wire way but this for me is the simplest way. Bob — KK5R
On Tuesday, January 19, 2021, 6:30:47 PM EST, kg9hfrank@... <kg9hfrank@...> wrote:
This past weekend, I went back in time and reviewd posts back to 2018. About half way through I started taking notes but... I did not take any notes on how to unbalance the balanced modular to get a signal out for using a tuner. Anyone have that info available? If I recall the ham disabled a resistor causing an imbalance and a steady signal came out which he used to tune his tuner. He turned it on and off with a toggle switch. -- Frank, KG9H
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Evan Hand
Frank,
It is not clear to me what you are asking. If you have a uBITX then the method that Bob describes is the easiest. If your question is how to do that, then here is the way that it is done in the v3 and later, displaying the v6 schematic: The way that works is that the first mixer (T1 and T2) is being unbalanced by a 5 volt signal from the Nano on the CW-KEY line. This forward biases 2 of the diodes in the mixer and allows the LO signal that has been changed to the frequency that is to be transmitted to be applied to the amplifier stages. It should be noted that the power output will be the full power for that band. The other way would be to use FT8 software or similar to generate an audio tone that can be adjusted in level for the power needed to activate the tuner. A third option would be tu use CW-TONE or generate a tone on the unused A7 pin to feed the mic input through a variable resistor. This would take modifiying the Nano code. Of the three, I use either the CW or Audio tone from FT8 software. 73 Evan AC9TU
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Rafael Diniz
Just set CW keyer to hand-key and key the radio, you'll get a continuous
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CW for tuner adjustment. I'm adding a "TUNE" button in my ubitx v6 interface code for this. Rafael
On 1/19/21 8:30 PM, kg9hfrank@gmail.com wrote:
This past weekend, I went back in time and reviewd posts back to 2018.
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Vince Vielhaber
On 01/19/2021 08:22 PM, Evan Hand wrote:
Frank,To get less than full power out, you can vary the voltage from 0-5v. TP13 (it looks like TP13 anyway) would be a good place to inject that variable voltage, you'd probably want to use a diode and resistor in line. I did that on my B40 and it worked well. I put the pot right on the front panel. Vince. -- K8ZW http://www.metalworkingfun.com http://www.hamradio.fun
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Jerry Gaffke
CW-KEY is doing exactly the same thing.
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When transmitting CW, CLK2 is programmed to be at the transmit frequency, CLK0 and CLK1 are shut down, and a Nano IO pin drives 5v on CW-KEY to unbalance the mixer. Jerry, KE7ER
On Tue, Jan 19, 2021 at 05:57 PM, Vince Vielhaber wrote: To get less than full power out, you can vary the voltage from 0-5v. TP13 (it looks like TP13 anyway) would be a good place to inject that variable voltage, you'd probably want to use a diode and resistor in line.
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Vince Vielhaber
Not EXACTLY. The nano puts out 5V. I said to vary the voltage to get less out.
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Vince.
On 01/19/2021 09:30 PM, Jerry Gaffke via groups.io wrote:
CW-KEY is doing exactly the same thing.
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Evan Hand
Vince,
I have not tried to use a variable voltage on the mixer diodes to control power through the unbalanced ring. Not sure if that would work, though would be curious as to the theory on how it would work. You still need to adjust the CLOCK#2 signal of the Si5351 and turn off the other two CLOCKs. To do as you are suggesting, you could install a switch between the CW-KEY and R104 to connect R104 to the CW-KEY or to a variable resistor to adjust the voltage that is connected between the CW-KEY and R104. Throw the switch and then press the CW key/PTT to get a lower level tune signal. Switch it back to do the normal operation. It would require that the CW mode be straight key, not keyer and that the CW mode is set in the v6 (not required in prior versions, just need the CW key connected). Above are speculations, so I could be off. 73 Evan AC9TU
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Vince Vielhaber
When you close the key, 5V is applied to unbalance the ring. A pot with a switch can take the place of that. Wiper of the pot thru the switch then to TP13 thru a diode and probably a 2k resistor. One side of the pot to ground, the other to 5V. Put the uB in CW and turn the pot to the desired output. I know it works, I did it on my Bitx 40.
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Vince.
On 01/20/2021 04:12 AM, Evan Hand wrote:
Vince,
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Al Duncan VE3RRD
Another option for adjustment of a tuner without transmitting is ND6T's "Polite Antenna Tuner" at http://www.nd6t.com/antenna/Polite%20Tuner.htm
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Frank Krozel
Thanks everyone, lots to think of, I use a paddle when remote operation so looking for something simple. Lots to digest, thanks all. Frank KG9H
(Informal uBitz net Sunday, 7.277 9:30A Central. de KG9H
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