开云体育

Do the other RF plots have low peaks like this one? If not, it may isolate the issue to a particular LPF, if so, then it's gonna be something that affects all bands. Did you scrape enamel and tin the

Keith, The shapes of the sweeps look good to me.? It is the magnitude of the peak values.? It should be close to 0 for the max value.? Here is the RF sweep for my working QMX on 20 meters: Note

I suspect that you're problem is with the frame start setting. Try setting it to 02 04 to see if it transmits every 4 minutes. If it does set start appropriately for your requirements, eg if you want

Hi, I would check also if the C510, C526 values are OK and the T507 primary (one turn) is not scratched somewhere. 73 Bojan S53DZ

Tony, If it helps with your SPICEing I've attached a screenshot of the complete circuit definition that I used in my QUCS simulation. It includes modest allowance for strays and losses. My 0.5ohm for

Hi Gyula, Nigel I think the rules stated on page 33 for the callsign format are quite definitive and correct: The callsign can only be 4 to 6 characters long. The callsign must consist of the

Hans, the wording in the operation manual can be misleading. On pages 33-34: "For callsigns such as mine, consisting of 5 characters, I must enter a space character as the first character in order to

Ryuji, I was about to start measuring harmonics when I toasted my radio so I cannot speak about existing performance. In redesigning the filters I was simply hoping that that the original design was

Thanks Hans and Dafydd, Works now, happily beaconing away on 20m 3watts (12v build running on 9V) . Perhaps a note in the next version of the manual to account for people like me who follow the exact

Well, I kept dinking with it and figured out a couple of things.? I set the Frame / Start was set to 001 01 because the manual says that for GPS stabilization it must be non-zero.? I wasn't aware

I would like to add an update. I ordered an inexpensive hot air rework station from Amazon, and that combined with the microscope mentioned previously, I was able to closely check the condition of

"I need a 4Volt 5Watt bulb" says customer "What?" asks seller "No!? Volt:? 4 Volt" answers customer. "What for?" asks seller quite upset...

Here are my Audio RF and Image sweep screen shots

Hello John Prima facie you are completely correct. However, I think it is not necessarily so straightforward; the words of learned respected persons such as yourself, or my opinion as the designer,

Evan - YES,? there is continuity from the BNC center post to one side of C526 but not the other. I am going to do the sweeps now and post them. Keith N8CEP

I have just completed building a new Ultimate 3s firmware version v3.12a.? I have install a TCXO and GPS with 1PPS connection only.? The GPS is updating correctly and the frequency is accurate and

Hans, I am quite happy to let the users review the data, such as it is, then contemplate the physics in the proposed explanation, and draw their own conclusions. JZ

Kieth, Another thought: can you verify continuity from the BNC to one side of C526 and not the other? 73 Evan AC9TU

Keith, Can you post the audio and RF sweep for the band you will use the most? 73 Evan AC9TU

Kieth, You will want to run the audio sweeps, the RF sweeps, and the image sweep.? This will let us know where the problem might be. The sweep value should be higher than -10 for the highest value