开云体育

All: I can't seem to find Rob's transceiver ranking list. Anyone have a URL that works? Jack, W8TEE

Another easy thing to do… put a heavy ground wire between all of the boards. Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ Owner - Operator Big Signal Ranch –

“The cap across the primary of T2 on my PA is for gain shaping.” I’ve never tried that… you should publish your results because when I ran just the first stage, the gain is very flat… almost

The cap across the primary of T2 on my PA is for gain shaping. The oscillation continues with the BPF and the LPF out of the circuit. I notice that additional grounding on the TR switch lowered the

If the receive signal is causing the feedback it probably means that one of the little switches on the LPF is shorted to work in both RX and TX. You might put the thing in TX, inject a signal into the

What’s that big disc cap for across T2 ??? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois Owner –

So, I swept the TR Switch from 5 to 50MHz using port J23 to ANT1 with PTT energized trying to find what is causing my amps to oscillate at ~30MHz. Attached is a plot from the NanoVNA. I tried shorting

Hey for those that want boards, I'll be in town for about 5 days so now it the time to order. ALSO I'd like to get a couple of these display driver boards into peoples hands (yes, build and free) to

Below in RED Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois Owner – Operator Villa Grand Piton –

Ok you have a lot of good equipment to solve this. Yeah it would not hurt to try shorting over the relay on the daughter board. I would also try removing the BPF board and just use a jumper to reduce

I have a TinySA, NanoVNA, 50MHz scope, DVM's, Taidacent Pwr Mtr, KiwiSDR, audio generators, assorted dummy loads, attenuators, and couplers. I used the NanoVNA to sweep the 20 wt Power Amp (I built 2

Bill, What about bypassing the driver? Can you share what the input power requirement would be after it, and/or how to do so? Can one basically bypass it and connect C1 to the input of T2, or is there

First off… what sort of test equipment do you have Dave? Just stuff like DVMs or do you have something like a VNA or a Spectrum Analyzer? And possibly a signal generator or another radio you can

It could also mean one of your SMA connectors is not making good contact…. Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ Owner - Operator Big Signal Ranch –

It means either the relay is bad, you have a bad solder joint on the daughter board, or the sockets/ pins are not meshing to form good contact. Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ

I replaced the TX/RX Switch with copper clad perf board and the oscillation disappeared (see pix) . What does that indicate? dave [image: TX_RX Switch Substitute.JPG] [email protected]> wrote:

Along with my front panel design project [which turned out to be the whole case] I have a set of knobs that include dual concentric, small and large sized for the T41 front panel.? There are

Yes that is because the bias is shut off when the PTT is zero volts… on above 3V. Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ Owner - Operator Big Signal Ranch –

Some further information - with the SWR tx out of the circuit the oscillations continue. When I remove the Tx/Rx switch the oscillations go away. [email protected]> wrote:

I get back tonight. Ill have some simple tests cooked up to get to the bottom of this. Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ Owner - Operator Big Signal Ranch –