开云体育

The US equivalent to the Kanga pocket trans match is EMTECH's ZM-2. 4SQRP has a similar tuner to QRP Guys and Pacific Antenna has some too. -- 73, Dan? NM3A

That's true, but it wasn't really the question, as I recall it. The question was about what made the lower voltage segment on the LIN_REG_EN line. Since I don't know the microprocessor, I can't

Yes, but typically modern processors have a variety of control methods that can be configured, one of which is an 'open collector' style where it only pulls the line low and leaves it to float high.

See my recent post here. Summary: Higher voltage is before the microprocessor comes on line. The lower voltage is after it's online and initialized, but not yet OK'd the switching power supply.

I did a poor job of stating my question. ?I agree with your assessment of the voltage regulator output. ?My question was about the LIN_REG_EN signal. ?If you look at the trace below, channel 2 is

Until the microprocessor comes up, LIN_REG_EN will be pulled up to +12 by R101. Once it's up and initialized, it will be fed by the microprocessor output from it's 3.3 volt supply. Does that fit

Nothing.? The Linear continues to produce 3.3V relative to it's 'GND' pin. if the supply produced by the SMPS is more then it provides nothing.? All this is confused by D102 andD103 which prevent

The QRPGuys SWR indicator uses an absorptive bridge in its design. I use it with my QMX. My problem is that I tend to band hop a lot and I often forget to switch it in for tuning. No problems yet, but

Evan's answer is correct but misleading because this is not the sort of SWR bridge that QMX has. QMX has a Stockton bridge and all it does is measure the forward and reflected power (or voltage?), By

I think there's some good argument (personal enrichment not least among them!) for using discrete parts. I like it, Hans! The thing I found difficult was that /both/ PS boards must be present (and

I have on of those QRPGuys SWR indicators. I've just not built it, yet. I wonder if I should us that or find and absorptive bridge. I'm planning to use a resonant linked dipole with the QDX when out

Although in the UK, Kanga Products make the excellent pocket transmatch as a kit but also as a complete built and tested unit. Not sure if postage to the US is viable, but worth

What is the mechanism that reduces the voltage on LIN_REG_IN during that half-way state from the supply voltage to 3.3V? ?It seems to me that the supply voltage passes through Q103 & Q105 (on the 5V

Hi Wayne, An absorptive bridge uses resistors and a voltage measurement to measure SWR.? The way that it does this puts the worst SWR the TX sees at 2:1.? You need to switch the bridge out once the

Wow! Thank you all for the responses. I'm thinking I'm going to give the TN0606 a try, and use some thermal grease. Thanks for that hint. I'm about to expose my real lack of knowledge by asking what

It seems to be in a half way state at that time, The linear supply FET Q102 is on and so is Q110 which provides a load for the SMPS. But Q111 is also on so the power can come from the linear or t

I suppose it depends on how they failed... I have (had) mine in sockets, so they're relatively easy to remove for troubleshooting. Good Luck! 73, Paul -- AI7JR

This group may be able to help. Wsjt-x-improved-community mailing list Wsjt-x-improved-community@... https://lists.sourceforge.net/lists/listinfo/wsjt-x-improved-community They were

I don't think LIN_REG_EN is turning "off" at 80ms--I think what we're seeing is the handoff from the initial supply voltage (through PWR_ON?) to the 3.3v signal from the processor PD7 once it has

Was successful today with WS (See picture) but not without hassle I believe caused by Windows OS and not the radio. About the time I think I have the turn on/connect/ enter sequence down pat something