开云体育

Thanks for the response but I think that the problem is that the computer doesn't find a driver. There is nothing to uninstall.

USB2.0-serial shows up under "other devices" and device status says no driver installed.

?? Bob

? SKCC 4203T

? FISTS 12014? CC 2025

Did you shut down your Bitx40 when listening on those other rigs? ?

Maybe your neighbor has one!

Ok, before you all take the raduino or the vfo apart, I'm getting the same birdie on my Icom, my Codan and my 817, as well as my homebrew MST-400. ? Looks to me ?as if this is an external phenomenon.

Norm vk5gi

McLaren Vale

South Australia

I have an Arduino Uno and have compiled and uploaded sketches to it. When it is plugged into my computer a serial port appears.

I have compiled one of the updated sketches but can't upload it to the Raduino. When connected to the Raduino I do not get a serial port, instead I see a yellow exclamation error next to "USB2.0-serial" in device manager under Windows 7. I tried updating the driver by pointing the update to the Arduino driver directory with no luck. I also downloaded the FTDI installation but can't get that to operate since I don't get a device other than "USB2.0-serial" to update.

My system is a 64 bit AMD. I noticed that the Arduino IDE is 32 bits.

I'm out of ideas and could use some help.

I agree. ?Also, be aware this amp will earn you another ticket unless you add an appropriate low pass filter to the output.

Don't think I've ever seen a "C linear".

Grounds are tricky alright. ?Grounding the shield at both ends is the standard way of using coax between modules. ?In this case we're mostly interested in a shield not a transmission line, so detaching the ground on one end is worth trying, perhaps with a 0.1uF cap across the gap. ?Some have reported that a large electrolytic cap across the raduino 12v power supply reduces the clicks, so there are likely spikes in the 12v current (and through all available grounds) when you spin the tuning pot. ?I'd tend to stick with the large electrolytic cap and perhaps a series resistor if that's all it is. ??

Though ground loops can pick up RF. ?Anybody who has probed a busy circuit board with a scope probe using a 6 inch ground wire at the probe tip, then went to just shorting the ring near the probe tip to the nearest circuit ground has seen evidence of this. ?The noise the scope sees can be reduced by more than an order of magnitude. ?If this is the issue, then you probably don't want that 0.1uF cap.

Where grounds are really trouble is when you have multiple power supplies plugged into different circuits from the main fusebox of the building.

Jerry

I tried your new library Pavel and followed your initialisation suggestion but found it had no impact on the clicks on my rig. If anything I thought they were slightly louder. Also maybe I wasn't using it correctly but the radio didn't seem to receive either suggesting that the frequency wasn't set correctly. I'm using CLK2. Have you got a sample BitX40 sketch using your library ?

Also I make use of the functions in the Etherkit library to enable and disable clock output for CW mode keying.?

Thanks, Andrew

Thanks Jack, I've learned something new !

I've updated the sketch now so there is just one .ino file and the other is .cpp so it gets loaded automatically by the Arduino IDE.?

I've also made the shuttle tuning configurable via the macro at the top :-

//#define UPSIDE_DOWN

//#define SHUTTLE_TUNE

just uncomment this if you want shuttle tuning. If you go for this option, there's now a scanner mode. Pressing function button 2 causes it to scan up the frequencies until it finds a strong signal.?

With traditional tuning, the same button implements a tuning lock to stop the frequency dancing about when you're not touching the tuning knob.

An HF amplifier idea and example.

Last year I made a CW kit that was plagued with second class components which earned me an Official Observer Card for frequency instability and chirp. and an RST of 578c. This spooked me and really squelched my tinkering and building ambitions. Until this BITX40 came along and someone on our local Tech Net recommended I get this thing. Well this someone talked me out of getting an amp kit for it because of the very low input rating.?

Well, I have seen a hack or project page with this same linear amplifier kit used on the BITX40. And I can't find it for you today. The reason I mention it now is the reference to using an amp in the instructions about adjusting the power output for QRP or an external linear amplifier. This kit and some others i've looked at want very low input levels. This one wants 1-5mW. I have wondered how this could be done with what I have. Perhaps pick up the RF signal before it gets to the final? What would be the power level at the drive transistor? In regards to the BITX40 I have seen the power output drop all the way down to nothing when turning the RV136 all the way down to the right (clockwise). ?As for measuring 1-5mW of power out, you might have to use special equipment and some math. And maybe some expert advice.

But here is a bit of kit to think about. This one is called ?DIY KITS 45W ssb linear power amplifier for transceiver HF radio AMP

I put the name up because links tend to die on Ebay?. So here is what I was talking about-

http://www.ebay.com/itm/2017-DIY-KITS-45W-ssb-linear-power-amplifier-for-transceiver-HF-radio-AMP-/121754204165?hash=item1c591db805:g:TS4AAOSw14xXFFS9

Received BitX40 (Ver3), (0317), today, 4-10-2017.?

Ordered 3-27-2017. Received 4-10-2017.

Dandridge, TN, USA.

serial no: N3-864V

73

Craig

KM4YEC

Hi Ian,

No, I did not miss it. I have downloaded what is available on http:// www.hfsigs.com but it could be better. My opinions above were not meant to slam the Creator of the Bitx, but to shed some light on what other builders or potential builders face when they go about deciding to purchase and build a project.?

I am happy to see folks taking the time to research, develop, and implement their ideas. I appreciate the fact that I am not an engineer but I hope to learn and use these projects as they are designed first. Then once all is well, I can go on to adding my ideas.?

I appreciate all the Ideas Folks, but I want to be able to use & enjoy the products they are offering and not just waste my time and money.?

73,

Kevin Gilot NZ1I

This interesting thread has just started on Github about the tuning clicks with the si5351 library:

Hopefully this will eventually lead to a solution!

73, Allard PE1NWL

Kevin and John,

Thanks for the information. It has already been implimented.

I put RG174 on the VFO feed from Raduino to main board early on in the build.

The line setting drive current to 4 ma is active and I may set it back to 2 ma as that is where it was before the birds showed up.

My intention now is to do the "factory reset" after I play around with a few things just for giggles.

Gotta find the time....

Tnx guys,

PJH, N7PXY?

Both of my local Radio Shacks are closing.

If you have one near by that is closing, check it out. I picked up some parts today at 80% off. Probably still slightly over priced, but there's no three week wait for the shipping from China.

James

KE4MIQ