开云体育

Have a usb oscilloscope with built in dds. Will check today. Thanks for the idea.

The incandescent lamp is good because resistance of the filament increases by 10x as it heats up. Here's an old thread on that:? ?/g/BITX20/message/31352 The back to back diodes on

A fix was earlier suggested for this. let us check Regards MVS Sarma jgaffke@...> wrote:

Very few reports here of Q90 on the uBitx getting blown. Q13 was getting fried quite often on the Bitx40. Farhan figures that front end protection diodes will create lots of extra spurs, and that the

You can put a very small lamp in series before the back to back diodes, to increase protection. Consider however that diodes would add some overload. Il 18/giu/2018 16:05, "Michael Babineau"

I got on late, about 7:15 Eastern.? I tuned around 7277 a bit above and below and didn't hear anyone.? I tried calling CQ BITX a few times, but heard nothing.

Don is out of town for the 4th and he can provide nice looking drawings. I probably need to put "snaps" on my board as often as I've taken it out of the unit. However the picture associated

https://sites.google.com/site/arvidevans/antennacurrentindicators _._

As it appears that the Nextion Display will be getting its +5V from the L7805CV regulator on the Raduino board, I started wondering if this regulator is up to the task (it is rated at 1.5 A) and if so

One correction to prior posts...the diode voltage is there to match the B-E junction offset, not to match the B-C drop. Farhan was careful to use silicon transistors and silicon diodes in order to

Depends on your definition of handheld.? There are plenty of guides available to run fldigi on a pi.? The radio, battery, pi, and ancillary cables and connections would be a handful for all but

If in doubt whether it is fine or not you might think to build a small signal generator that is able to generate just an above noise level S3 and and a good S9 signal. I made the

I don't use Domino or Thor.? I do use PSK31 on a Rpi-3B and I see no reason why it would not work with uBitx.? Hand held however is unlikely as you need a fair amount?of battery for the radio, Pi

Yes.? I did that with a nano and 2lin display to modify and test code without messing with the uBitx until I was happy.? It was an easy wireup and while its not as pretty/compact it works just

Meanwhile, over on the Zed, KE0EYJ asks, "I was wondering if there is any kind of 5w HF radio (BITX?), combined with a Rasberry Pi (or something similar) running Fldigi (or similar) as one unit, that

It is just a dipole with 300ohm line. Also use a CHA 250 b.

Once I looked I noted that.? The DC quiescent point for the amp is not guaranteed due to HFE of the transistors.? All of the traditional designs use the output (junction of the emitter resistors) as

NOTE: I purposely ordered the 3.5 inch display. Tom AB7WT

I ordered a 3.5 inch enhanced display from what I think is the vendor ITEAD.? I used guidance from the ubitx.net reference.? Any confirmation on this model being correct or incorrect would be much

Circuit diagram to enable this idea?.. [email protected]> wrote: