The dipole is a good antenna, you will likely be able to get a near 1:1 swr with your analyzer. In any case the difference would be almost negligible. In a couple of years, as propagation improves you

#ubitx #nextion

The ubitx might scare the majority... being too educational. There are by the way really good (low phase noise, good blocking etc) and durable transceivers, like the IC-765. Of course I would vote for

I would check the values of the resistors around Q94

The fact that pwr out is around 50% is suspicious. Maybe one of the two sides of the pushpull PA has an issue.

#ubitx #ubitx-help

Once my Drake was delivering just 70 watts... I thought it was the age... Nope... There was a bad solder in my SWR PWR.... and the power was back to 140w! This is to say not to always trust in power m

#ubitx #ubitx-help

Just for curiosity, I have simulated (the same link suggested by LNR or PARelectronics) a no brand small loop I bought from a hamfest. It is for 2M, when I bought I was told efficient at 95%, SWR=1 at

Maybe it would be easier to test if made for the 2m band and compare with a ground plane and a dipole at different heights. It is interesting the link https://www.lnrprecision.com/store/W4OP-Loop-Ante

To avoid this sort of mistake and save the RX I use a coax switch, in the worst scenario I would fry the PA finals of the ubitx.

#ubitx

As far as I have understood, loops have poor efficiency (something like 10%, ie - 10db), although they might have rx advantages. Did you software modeled it first? What would the efficiency be?

This shows that a couple of back to back diodes somewhere in the RX chain (albeit they might worsen imd figures) might be useful to prevent or mitigate this sort of damage. If you have a signal inject

#ubitx

I have a 2 amp that goes in protection when turning on. Just trying to turn it on without transmitting. But when I use a greater amp I have no problem.

I have used the AD8703 to roughly estimate the output levels of oscillators (I have no oscilloscope), like dds and si570. If genuine it should be linear up above 0dbm, depending on the frequency. In a

I had experienced two cases of random errors. The first when I did not solder correctly the two resistors. The other when the jack contacts were not doing a perfect contact. Note that I am not using a

#ubitxcw

I got used to it. Il 26/mag/2019 20:30, "IZ4SJP Carlo" <carlo@tarozzi.net> ha scritto:

#ubitx

As other have said it seems the BFO. You probably need to shift by at least 500hz. This picture is very similar to the one I showed to a professional vendor when I bought from them a 'fully aligned' t

Looking at the schematics I would said it could be almost a receiver (apart from the AD part)... Interesting. Up to which frequency could it be possibly used? 23cm? Il 21/mag/2019 10:29, "Evan Hand" <

Check PTT and it's wiring. You should at least detect the carrier even if you don't speak Il 20/mag/2019 19:31, "danilo datres" <in3izq@alice.it> ha scritto:

Right Joe, if you need many of them you end up paying more. And the ones I mentioned, rated at 300w, might not even needed for that amp. However if some have some ferrous toroids (say red, yellow or w

I am in the opinion that a LPF like that at 50usd is overpriced. Toroids seem small, what about the capacitors? Are these ceramic or silver-mica, rated at what voltages? You may have a look to http://

Do not use receivers that have an antenna connected. Remove the whip of the degen if possible. Transmit into a 50ohm dummy load and not to the antenna for these tests. Il 15/mag/2019 21:48, <laurent.b