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So in order to know which value I should use i should have equipment such as an oscilloscope... i may return to previous values... a shame i already removed the smd cap

You can still get rosin core solder. Using that stuff is like burning incense.? If vaporized lead has been an issue all these years, I'm done for. Could explain a lot. Jerry, ?KE7ER

Changing the capacitance at C102/C103 will adjust the frequecy of the BFO, , typically at 11.998500 mhz. Farhan found that with 47pf at C102 and with all five 12mhz crystals matched, the BFO was

if you have place your Bitx40 for 7.0000 on display and you han a reading about 5 MHz just say ( reading*5 ) and place result in this line : ?si5351.init(SI5351_CRYSTAL_LOAD_8PF, 24994650L,0); (

Thanks much, I didn't realize they were that inexpensive. Might add a light and magnifier to the one on an adjustable arm. "Re: Solder fume filter From: David McGough Date: Sun, 11 Jun 2017 17:13:08

These are the best "cheap" filters I've seen--adequate for casual work. I've got models similar to both of these. http://www.ebay.com/itm/391024007986 http://www.ebay.com/itm/131996210966 They're

Any suggestions for a cheap, effective benchtop solder fume filter. ? Currently I use my bench in the garage but I'd like to move into the house. Of course to do this I have to be smoke and odor

I have noticed that when intouched with the tester probe into the the sound from the speaker become louder. So, i decided to try this mod that Peter showed o his video https://youtu.be/IELJwapv5qsp (

Jonathan KK6RPX wrote... I ordered a BITX40 on June 2. It will be used on Salt Spring Island, BC. It was after ordering a hot air soldering station that I started looking for SMD QRP kits that I came

I have this one good on rx but poor on tx whizz loop antenna by moonraker there are two versions starting from 7 or 14mhz

A really cheap and simple option worth trying is an indoor dipole. Check out this page, http://www.swharden.com/wp/2010-02-07-simple-diy-stealth-apartment-antenna-for-20m-and-40m/, and omit the 20m

The NPN's powered from the "TX" 12v rail do not get power unless the PTT switch is pressed to transmit. I suggest you concentrate on the receiver first. When checking out the transmitter, no need to

Ola amigos Estou pensando em comprar esta fonte portatil? para um linear de 40m ...já cansei dos QRPps com esta propaga??o...rerere http://www.oreillyauto.com/flux-capacitor.html (

You may be very lucky here, everything could just work.? The transistors are all protected by a diode or resistor or both. I suggest you just put everything back together and see if the receiver

It is certainly possible that I reversed the supply leads - all of the other wiring looks ok but I might have simply put the spade connectors on the wrong way round. I used the battery because it's

Is it possible that you did reverse the power supply wires into the Bitx40? That battery is quite small. Could be the battery didn't have enough power to blow the LM7805, but was able to blow D7. When

That's very interesting! Many thanks for testing. I will try on my own BitX and see if I can reproduce this. Will keep you posted. 73 Allard PE1NWL

Arv, I've been looking into what might happen if somebody reversed the 12v power supply leads into the Bitx40. Have found that the LM78* regulators would not protect what lies behind them. ?(But an

The battery is a 1.3Ah 12V sealed lead acid battery.

Ok Cesar, I don't think you'd fry your counter, the freq amplitude directly from the Raduino is pretty low, if unsure just make voltage divider with a potentiometer and feed the counter through a