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Good place to tap for PTT-OUT
#v5
Hi, I'm looking to add a PTT-OUT to the back panel of my uBITX, to control e.g. an amplifier or a switch to isolate an external SDR during transmit. My thought is to grab C154/D11 or one of the other
Hi, I'm looking to add a PTT-OUT to the back panel of my uBITX, to control e.g. an amplifier or a switch to isolate an external SDR during transmit. My thought is to grab C154/D11 or one of the other
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By
Rob French (KC4UPR)
· #86881
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Homebrew CW audio filter for uBITX - thumping/distortion on leading edges
Ah-ha. Two new things... one, this is ringing. I checked the spectrum on the dots a little more carefully, and I can see that those additional spikes are clearly multiples of the peak frequency. So wh
Ah-ha. Two new things... one, this is ringing. I checked the spectrum on the dots a little more carefully, and I can see that those additional spikes are clearly multiples of the peak frequency. So wh
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Rob French (KC4UPR)
· #84923
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Homebrew CW audio filter for uBITX - thumping/distortion on leading edges
Hello, I've implemented a simple audio band pass filter for CW on my uBITX v5. It uses 3 sections of a TL974 op amp running off of 5V regulated (the 4th section of the op amp is used a buffer for a li
Hello, I've implemented a simple audio band pass filter for CW on my uBITX v5. It uses 3 sections of a TL974 op amp running off of 5V regulated (the 4th section of the op amp is used a buffer for a li
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Rob French (KC4UPR)
· #84922
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Wanted: uBITX v5 (unfinished)
Does anyone have a uBITX v5 kit, unfinished, that they are not interested in completing? I'd like to build a "twin" to my existing uBITX v5. Would rather use a v5 than a v6 due to the extra components
Does anyone have a uBITX v5 kit, unfinished, that they are not interested in completing? I'd like to build a "twin" to my existing uBITX v5. Would rather use a v5 than a v6 due to the extra components
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By
Rob French (KC4UPR)
· #84671
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kit-projects AGC with uBITX v5 - need help
#v5
Whoops, didn't finish that thought. So, my switches appear to be wired up right. In AGC Off, everything works fine. In AGC Fast/Slow, I get very little ADC, and no AGC action. You mentioned the buffer
Whoops, didn't finish that thought. So, my switches appear to be wired up right. In AGC Off, everything works fine. In AGC Fast/Slow, I get very little ADC, and no AGC action. You mentioned the buffer
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By
Rob French (KC4UPR)
· #84232
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kit-projects AGC with uBITX v5 - need help
#v5
So, I actually rewired this with a pair of SPST toggle switches I had lying around (one for ON/OFF, one for FAST/SLOW). In retrospect, I don't think I had a switch problem in the first place. I still
So, I actually rewired this with a pair of SPST toggle switches I had lying around (one for ON/OFF, one for FAST/SLOW). In retrospect, I don't think I had a switch problem in the first place. I still
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By
Rob French (KC4UPR)
· #84231
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kit-projects AGC with uBITX v5 - need help
#v5
Black to ground, resistance, below. To be clear, this is measuring from the square pad at the end of the diode, where I have the thin black wire soldered in the picture. OFF (down) - 0 ohms SLOW (midd
Black to ground, resistance, below. To be clear, this is measuring from the square pad at the end of the diode, where I have the thin black wire soldered in the picture. OFF (down) - 0 ohms SLOW (midd
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Rob French (KC4UPR)
· #83918
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kit-projects AGC with uBITX v5 - need help
#v5
Sorry, you had asked about the black wires by RF Gain. Those are two lengths of RG174 to a front panel RF gain pot. I have since removed those and replaced with a jumper while I troubleshoot.
Sorry, you had asked about the black wires by RF Gain. Those are two lengths of RG174 to a front panel RF gain pot. I have since removed those and replaced with a jumper while I troubleshoot.
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Rob French (KC4UPR)
· #83916
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kit-projects AGC with uBITX v5 - need help
#v5
Sorry for the delay on this. Life. The black wire corresponds to the purple/magenta wire in the instruction manual, i.e. it connects across the two middle terminals of the switch. The switch is kind o
Sorry for the delay on this. Life. The black wire corresponds to the purple/magenta wire in the instruction manual, i.e. it connects across the two middle terminals of the switch. The switch is kind o
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By
Rob French (KC4UPR)
· #83915
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Nieuw TFT-bestand voor Nextion Enhanced 3.2 met CEC 1.2
#nextion
Interesting, I just tried the link that you posted above, and it worked just fine???
Interesting, I just tried the link that you posted above, and it worked just fine???
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By
Rob French (KC4UPR)
· #81709
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Keeping the finals cool
Well, I guess this answers this... I have so far had no luck killing the fan electrical noise. It's in the low-hundred Hz, with some harmonics (though at least on my digimode waterfall, the only spike
Well, I guess this answers this... I have so far had no luck killing the fan electrical noise. It's in the low-hundred Hz, with some harmonics (though at least on my digimode waterfall, the only spike
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By
Rob French (KC4UPR)
· #81686
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Audio bandwidth between the product detector and VOL-H
Hey Evan, thanks for the input. I've actually previously done some DSP filtering with the Teensy, I had it communicating with the Raduino Nano via serial, to coordinates modes. Unfortunately, I accide
Hey Evan, thanks for the input. I've actually previously done some DSP filtering with the Teensy, I had it communicating with the Raduino Nano via serial, to coordinates modes. Unfortunately, I accide
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By
Rob French (KC4UPR)
· #81673
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Audio bandwidth between the product detector and VOL-H
I have a uBITX v5 that I have been playing around with in many ways, for many months. I'm revisiting some earlier DSP work I had done, and had a thought. I want to try a 3rd "DSP" IF of around 16 kHz
I have a uBITX v5 that I have been playing around with in many ways, for many months. I'm revisiting some earlier DSP work I had done, and had a thought. I want to try a 3rd "DSP" IF of around 16 kHz
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By
Rob French (KC4UPR)
· #81662
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New TFT file for Nextion Enhanced 3.2 with CEC 1.2
#nextion
Hey all, I'm guessing no one cares much at this point (may be obsolete), but I've created an updated set of displays for use with the CEC firmware version 1.2 and a 3.2" Nextion Enhanced display. Why?
Hey all, I'm guessing no one cares much at this point (may be obsolete), but I've created an updated set of displays for use with the CEC firmware version 1.2 and a 3.2" Nextion Enhanced display. Why?
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By
Rob French (KC4UPR)
· #81660
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Relay for antenna tuner output?
Clark, Thanks! I'm going to file that under, "Duh... why didn't I think of that..." I suspect I won't be able to source the exact part, but I see the parameters printed on the tops of the relays, so I
Clark, Thanks! I'm going to file that under, "Duh... why didn't I think of that..." I suspect I won't be able to source the exact part, but I see the parameters printed on the tops of the relays, so I
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By
Rob French (KC4UPR)
· #81402
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Relay for antenna tuner output?
I use one of those N1DDC-style automatic antenna tuners from Russia (eBay) with my uBITX. I've been thinking about building a dummy load into the antenna tuner case (or even external for that matter,
I use one of those N1DDC-style automatic antenna tuners from Russia (eBay) with my uBITX. I've been thinking about building a dummy load into the antenna tuner case (or even external for that matter,
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By
Rob French (KC4UPR)
· #81383
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kit-projects AGC with uBITX v5 - need help
#v5
One more solicitation for help, hoping someone has some thoughts. Big picture, I don't *seem* to get any AGC response either due to the audio input to the AGC (which does register an S-meter reading,
One more solicitation for help, hoping someone has some thoughts. Big picture, I don't *seem* to get any AGC response either due to the audio input to the AGC (which does register an S-meter reading,
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By
Rob French (KC4UPR)
· #81382
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kit-projects AGC with uBITX v5 - need help
#v5
Hello, I've posted a few times on here about my kit-projects AGC. I'm thinking that I've never really had it working right, and am hoping I can get some help. Here's my setup, and here are my symptoms
Hello, I've posted a few times on here about my kit-projects AGC. I'm thinking that I've never really had it working right, and am hoping I can get some help. Here's my setup, and here are my symptoms
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By
Rob French (KC4UPR)
· #81293
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Digital Interface - transformer seems to drastically weaken signal
Hey Evan, Really I think the only difference between EasyDigi and my setup, is that the Teensy + Audio Adapter takes the place of the sound card. The added capability of the Teensy is that I plan to (
Hey Evan, Really I think the only difference between EasyDigi and my setup, is that the Teensy + Audio Adapter takes the place of the sound card. The added capability of the Teensy is that I plan to (
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By
Rob French (KC4UPR)
· #80733
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Digital Interface - transformer seems to drastically weaken signal
Hey there, I've prototyped myself a variant of KK5JY's AnyRig digital interface ( http://kk5jy.net/AnyRig-v1/ ). The Teensy microcontroller piece of this is very straightforward to me, as I have previ
Hey there, I've prototyped myself a variant of KK5JY's AnyRig digital interface ( http://kk5jy.net/AnyRig-v1/ ). The Teensy microcontroller piece of this is very straightforward to me, as I have previ
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By
Rob French (KC4UPR)
· #80707
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