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Re: Progrock/SI5351 with tube type Motorola P33
Ha! I have a couple in the basement.? One is tube/xistor and the other is fully transistor. International Crystal wanted too much for reuse crystals.? The ¡°Porta Pac¡± Larry KB3CUF? On Wed, Apr 10, 2024 at 4:15?PM ajparent1/kb1gmx <kb1gmx@...> wrote: First Its been 55 years since I used to service them.? |
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Re: I let the smoke out¡
JZ and Ludwig,
I have done a lot of data collection that I am attaching here. All of these measurements have been done with the 1.6 VDC battery hookup through L502 as the earlier picture shows.? Also, the radio is in 20M band and 14.074 MHZ. I am most confused by the voltage data collected in the attached spreadsheet.? My understanding is that the radio should be forward biasing LPF 0 when in 20M band.? Q509 looks like the gate signal is OK, but the Drain is about zero?? On Q510 the gate is zero but the drain is just about the full supply voltage!? Shouldn't the drain of Q509 be about supply voltage and Q510 drain be about zero, or am I misunderstanding the schematic? I checked the anode/cathode direction of the diodes D508 thru D513 many times and they all look correct. I believe we have already established that Q507 is internally shorted.? We tried to work around this failed component with the 1.6 VDC battery through L502 to test the rest of the transmit path.? Am I correct that the rest of the path seems like it is not operating as expected? Please weigh in on any light you can shed on this data and any suggestions you have for moving forward. As always, thank you so much for your patience and assistance. Mike |
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Re: QMX whet quiet during transmission
#20m
#50w
#qmx
#troubleshoot
#troubleshooting
On Wed, Apr 10, 2024 at 10:43 PM, <Lytkemeyer@...> wrote:
approx 1.3A when sending.Very high, dangerous without a good load. For more investigation avoid sending and reduce supply voltage to around 7 V for short tests. Please connect a dummy load and go to Terminal - Hardware tests - Diagnostics, press "T" only for a few seconds to transmit and make a screen shot while transmitting. Please post this here. Do you have an external rf power meter? 73, Ludwig |
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Re: QMX whet quiet during transmission
#20m
#50w
#qmx
#troubleshoot
#troubleshooting
Correction, when running SWR sweep on 20m QMX consumes 1.4A and SWR needle show a tiny signal when at maximum sensitivity
Using HW Tests - Diagnostics, I see 0w output on all bands except 15 and 11m where it shows 0.1w and the needle on my SWR meter moves a tiny bit more. |
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Re: QMX whet quiet during transmission
#20m
#50w
#qmx
#troubleshoot
#troubleshooting
No output from the QMX on antenna when sending. I connected a power meter direct to antenna conn.
I hear the dit and dat in the speaker and can see what I sending on internal morse decoder in display. Power consumption is 120mA at 12v when receiving and goes up to approx 1.3A when sending. It behaves, as if antenna is not connected to radio... |
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Re: QMX whet quiet during transmission
#20m
#50w
#qmx
#troubleshoot
#troubleshooting
On Wed, Apr 10, 2024 at 09:36 PM, <Lytkemeyer@...> wrote:
Then the QMS when quiet, not able to send or receive anything. ... neither will it send anything on Ft8 or CW.Is there an output from the QMX stand allone or not? Without prducing rf no measurement of the SWR. Did you test the QMX without any connection to the PA? 73, Ludwig |
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Re: Pushbuttons are not responding
Well, that was supposed to be I cannot thank you all enough!!! Sorry about that. I was so excited I got the radio going that I how to form sentences!! On Wed, Apr 10, 2024 at 4:04?PM <DH8WN@...> wrote: On Wed, Apr 10, 2024 at 05:41 PM, Wayne Greene wrote: --
Wayne Greene |
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Re: Progrock/SI5351 with tube type Motorola P33
First Its been 55 years since I used to service them.?
They are narrow band for RX and TX so wide excursion for the crysts were not allowed without retuning the whole radio.. Also Neither side of the crustal is grounded to aalow for netting the crystal. So the input should be from ground to the high side crystal pin. You will need a buffer (at least one transistor) to get enough signal to? provide the tube side with enough RF.? The transistor side may require that as well.? The input should be ground referenced (chassis) and feed though DC blocking cap (.01 uf is enough) Now I remember why I had a stock of 1AD4s. -- Allison ------------------ Post online only,? direct email will go to a bit bucket. |
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Re: Pushbuttons are not responding
On Tue, Apr 9, 2024 at 04:57 PM, Wayne Greene wrote:
ANOTHER PROBLEM: So, I was testing the voltages of a known good radio, when it suddenly shutoff.Hello Wayne, maybe you made a connection from header pin 7 to pin 5 (the neighbor). Its like pressing the left encoder (Shut down). 73, Ludwig |
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Re: QMX Moves to Shutdown
On Wed, Apr 10, 2024 at 05:57 PM, Gary K4VIG wrote:
about 80 to 90 maHello Gary, this is fine. I guess, there is a short (not a dangrous) around the connection between the main board and the controls board or on the controls board. To switch on the QMX regular you have to connect to the power supply and press the left encoder. Pressing again "longer" starts the shut down procedure. I guess after connecting your QMX to the power it switches on direct and after this shows "Shut down!" for eternity. Lets have a look on the schematic_rev2.pdf page 3. JP302 is the connector to the main board. S304 (on the left) is the push button of the left encoder. Pressing this encoder connects pin 5 to GND. In your QMX pin 5 (JP302) seems to be connected to GND all the time. Maybe there is a bridge at the connector or direct at the encoder. To identify the pins at the controls board have a look in this discussion. There is a drawing of the pin header. So you could identify the pins in in the hardware (ref GND). 73, Ludwig |
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QMX whet quiet during transmission
#20m
#50w
#qmx
#troubleshoot
#troubleshooting
Hi, I'm looking for tips to troubleshoot an issue with my QMX.
Its a rev 1 board that I have build for high bands and it worked great for a while, I have logged 20 QSOs. To be more precise, I was fine until firmware 017 was released and I enabled PTT for 20m to connect it to the 50W Amp that I had build previously, ran it at 12V as reccommended by Hans and got 18w or so of output. Did a few Ft8 QSO's and was quite happy with the result. What happened next is where it when downhill. Had to try to increase supply voltage of the 50W amp to 20 volts to se if it was able of delivering 50w. It WAS :-)? for a few transmissions that is. Then the QMS when quiet, not able to send or receive anything. Display looks fine, able to navigate menus as normal. Back ground noice in the headset but no signals gets received, neither will it send anything on Ft8 or CW. What have I done so far...? I have done a factory reset and reflashed with 017 - no result. I have checked supply voltage 3.3 volt and 5 volt - both looks fine I have checked diodes (1n4007) using a multimeter - looks fine. I have run swr analysis using usb via PC - pattern matches my antenna profile. (clear diff when antenna is discon.) I have run out of ideas, pls. share you tips for what to check next... Thanks Per (OZ1KTC) |
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Re: New QLG2 Intermittent Odd Start-up Behavior
Well, a friend suggested that it might be a heat related issue. The QLG2 has been in my basement for a couple days, and that might explain why it came to life first thing this morning? So I tried a spray with the inverted duster on the GPS module, and doggone it if it didn't spring to life instantly. After it ran for a while, I power cycled it again, and got the solid LEDs. I gave it another inverted duster spray, and voila, it was alive. I think we have a heat tolerance issue with some of the GPS chips.
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Re: VAT and postal service charge
I believe, in Germany, Zoll is the catchall category for VAT and import duty (and excise duty, if applicable), since it's collected by Zoll at time of import (if it hasn't already been prepaid). There usually is no duty for low-priced QRPLabs items (I believe the maximum duty-free amount is €150), just VAT since it hasn't been collected prior to "import" into Germany.?
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Re: Progrock/SI5351 with tube type Motorola P33
Hi Tyler,
I'd use 10-20pF to couple the Si5351A's signal in at pin 4.? You'll probably have to disconnect some of the other components and change the bias at pin 2.? See the other circuits in this radio that use the 1AD4 as an amplifier and make this one look like one of those. Cheers Halden VE7UTS |
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Re: New QLG2 Intermittent Odd Start-up Behavior
I¡¯ve seen this a couple of times as well which is probably due to ?insufficient quality of the powerup reset.? Make sure you apply power quickly to the QLG2 (e.g. using a toggle switch) or fast plugging in of the USB connector.? On Wed, Apr 10, 2024 at 12:46?PM bsb via <bsb=[email protected]> wrote:
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T401 continuity with IC402
Successfully made and wound the trifilar winding on T401 and confirmed continuity between A-A & B-B & C-C windings before and after soldering to the board.
I can't figure out how to use the solder blob method of removing enamel without wrecking the through-hole, so I scraped enamel off the ends of the windings prior to soldering. After installing? T401 there is no continuity between the T401 windings and Pin 9 on IC402. ? Any ideas what may be wrong? ¡ª¡ª¡ª¡ª¡ª¡ª¡ª¡ª- Jim? N7RCS Palm Bay, FL |
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New QLG2 Intermittent Odd Start-up Behavior
I "built" a new QLG2 kit to use with my QMX, and the unit is acting strangely. Every once in a while, they will all come on, and then a moment later the green will extinguish and yellow will flash - as expected. I cannot reproduce this behavior on demand, it happens randomly. The SMA connector is NOT shorted. Disconnecting the antenna does not change the observations. Is there any way to reset the GPS module? |
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Re: Progrock/SI5351 with tube type Motorola P33
I¡¯m inclined to think a .1 uF old school (orange drop sprague) or similar, in series. Ground the Si5351 to chassis and try each side of the crystal socket and you should be ok. There may not be enough drive though, a buffer amp might be necessary.? Larry KB3CUF? On Wed, Apr 10, 2024 at 1:31?PM Tyler- WZ5TX <wz5tx@...> wrote: Does anyone have a recommendation on the coupling cap value I should use? |
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