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has anyone had any problems with delivery on this? im getting no response from any emails sent and its an xmas present! any advice on what to do next will be greatly appreciated! Thanks Lisa

John I think I got it but I want to try in a sketch. Work and xmas season is getting in the way, so probably won't be able to do anything for a while. I appreciate your help and I will get back to

the 1N4148 mixer of the bitx has actually a better IIP3 than the ADE-1. I would guess that this is on account of larger FT37-43 ferrites and 1N4148 being a larger signal diode than the schottky diodes

Very nice. This looks like an easy way to put the VFO in the U.S. SSB band. I'll bet the 18 KHz is from a CFL or LED light bulb. My board came without C95 installed. The schematic shows 47 pF, but I

There must be a 18KHz source around my desk somewhere that's coupling in somehow. False alarm on that one (probably). As for alignment, I adjusted C93 but was only able

I've now added an S-meter to this AGC. I wouldn't say it's a very good S-meter since it under-reads on weak signals and is too generous on strong signals. It's as if a fairly sharp threshold was

Thanks for the input. All the technical aspects of the filters are a bit beyond me, but is it safe to say that the performance differences will not be noticable in my bitx? Also, are the diode ring

Can any one help me ,how can I work with bitx40 v3.Now I am QRV in San mode with approx.5 watts. Since I am a cw lover I asked this question BITX20@...> wrote:

I'm running this off one of the cheap Chinese 12V Li-Po battery packs I bought a few years ago. I'll try it on 12V of alkaline cells tomorrow. Thanks, -

John, there seems to be an strong 18 KHz moduation on the transmitted signal. i have a home-built spectrum analyzer that I have used to see the output spectrum. There was a strong spur in the output

Wait a minute. The schematic identifies this transformer as T4 of the BFO. T3 is not on the schematic. john ---In BITX20@..., <farhanbox@...> wrote : I drew the circuit diagram in

Think of it this way: VFO - IF = RF. Does this result in sideband inversion? (hint: -IF + VFO. It it positive or negative?) Why don't you try it and see what happens. If you get nothing but garble,

I drew the circuit diagram in Kicad and laid out the PCB with this circuit linked to the diagram. Kicad runs extensive checks to see that PCB layout and the circuit are in sync. After this, the gerber

Yes, you can do that. In the analog VFO, the voltage on the varicap determines the frequency. So reversing the voltage polarity of the tuning pot will "reverse" the frequency coverage; it will not

Opps. Not 18.998600 - 4.998600 = 14.0. Should be 25.998600 - 11.988600 = 14 or is this the wrong sideband? 73 Ken BITX20@...> wrote:

I noticed that my BIT40v3 was well shy of the top of the band. On the spectrum analyzer, I noticed two other peaks about 18KHz on each side. They seem to be a bit higher than I'd expect, but I'm a

John I had noticed the reverse tuning of the Bitx40, but adjusted the sketch to fix this. I also made a second sketch to work on 20M, using a 18.998600 MHZ VFO. So 18.998600 - 4.998600 = 14.0. Is

i had to replace the Q15 i har a shorting prob so im not sure if the LM386 is dead i still have some audio and the volume works but its very low compared to when i first fired it up

What did you do to resurect the bitx? BITX20@...> wrote:

well i got my dead bitx40 back to life but now i have very low audio output :) any suggestions i can receive signals just the audio output to my headphones is very low