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Well, thanks again John for trying to help, but the BSF threaded rods arrived yesterday, and it turns out that that isn't the right answer either. I'm really starting to think Jennings used a

I just got 10 x irf510 from ma components in the UK cost ?7.55 via amazon so fast got them in 24hrs they look the same as fitted in the bitx 40 so I think there good stock

Today the new AD9850 DDS has arrived and now everything is working again as it should. I let the Diodes in series with the AD9850 Vcc supply jumpered, because it really runs "hotter" for me (as

the power supply going to raduino has to be filtered at -close to raduino by say 100uF and 0.1 disc cap or MLC cap. -- Regards Sarma

I've finished the Bitx40 experimental project today. I added the AF-AGC and LM386 POP limitter with raduino v1.20.1 (Thanks Allard). And I also added the DuinoVOX for Digital Mode operation. It's a

For the bpf you can use the 100pf that are fitted but c4 you will need to add 20pf on the bottom of the PCB c1 and c7 you need to remove and on lpf remove l6 l7 and c160 and c163 mine is not air

This is what I have for 80m it came from a mkars 80 its basically a 80m bitx see photos of bpf mod and lpf mod

Signal into the microphone input should be more like 50 to 100 mv. You might look over this post, especially the first link: ?/g/BITX20/message/23640 (

I've never tried it but it should basically be possible. However note that the standard filters are dimensioned for the 40m band, so some additional hardware modification is required. 73 Allard

I've never tried it but it should basically be possible. However note that the standard filters are dimensioned for the 40m band, so some additional hardware modification is required. 73 Allard

Hi Group, My BitX has never really been able to show much of a jump in current when performing the loud HELLO test. ?With my fiddling, I can now not get any current increase when talking, so may

Now I get it. Thanks.? I'm new to this SSB stuff - AM and FM are much simpler! :)

Here's one such list: ?/g/BITX20/message/28827 ( /g/BITX20/message/28827 ) I suppose I could edit it some and dump it into the files section, or maybe into the

Brian, I'm just using the 5 mhz in its original format. I'm not familiar with the article by Tom Hurst's I'll look it up but real quick I'm just seeing the harmonics at 14, 21, 28 the rest of the

The diodes are not in any build Bitx as far as I know They need to be added. Also a fuse and the 100pf cap. It does make it confusing for new members to catch up with all that has gone on since late

That's L8 near the Final. ?The pdf of the schematic is kind of chunky, but if I zoom it up enough it's mostly readable. L5 is in front of Q10, the crystal oscillator for the BFO.

Ah yes the cap. Online costs have put me off the project for nearly a year. I just got the gumption to try and make my own butterfly capacitor, and it turned out pretty good for a first run at it. Of

Which L5 are you talking about, Mark? As I read the diagram, L5 is always fitted, in series with the PA PWR line (to the Final Q15), allowing the DC power through but impeding the final's RF from

The high side VFO at 19mhz has advantages. I suspect Allard uses it for USB because it requires minimum hardware mods to give switchable LSB/USB in software. Another advantage is that there are fewer

Depends on how you do it. Allard's code simply moves the VFO from 5mhz to 19mhz, which flips between usb and lsb. No hardware mods required, other than to remove C91,C92 to keep them from sucking