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WIlliam, ITs missing a stage if you want to use 2n3904s at 10DB.? However if you use a higher frequency (and likely a more costly) part that is not required. Its about gain three stages at roughly

The UBitx and case has been sold.? Thank you all. 73 Fr RichardWB8YXF

That is the total bandwidth of the filter. The following is not exact but close enough for me to see what was going on. I fed an audio signal into the mic input at 1000 Hz. At 28 Mhz I was getting 5.5

I just received ?mine today and plan on getting it up and running just as it was shipped. Their are changes I want to make but for now I am going to put it on the air like it came. That ?is just

My doubt is because the same pass filter of BITX40 should not have 6uH because the scheme says 40 turns on toroid T30-6. Apparently this does not affect you. On the other hand I thought it was a

Please do not create a new topic for this every time you post.? I make it hard to provide answers because we replied over in the other post. You are not alone. The problem is understood and people

LIke Arv said.? and if its low or high spreading to closing the turns will move the value some. All you care is the frequency of resonance.? You can tweak the cap soem to make it work. Allison

W3JDR ? Thanks for sharing, this is somthing I would be interested in. I have a maple mini and it does have the 128k but the blue pills I have are C8's ?and are 64k . ?I have seen articles where

its easy enough to alter the capacitor values.? To what is a guess by anyone that answers as your crystals may be different from someone else. Try lowering all of them by 15% and remeasuring.? You

If you are operating at 7070khz, and you feed in an audio tone of 1000hz, the rig will output rf at 7071khz to give you an idea. The SSB filter operates at AF, but it is relative to where the

Sorry to be such a novice, but is that 1600-1700 centered around a particular frequency?

Arv, You have it nailed.? THe 2n3904 would have an effective gain of maybe 2. I've done a few and generally the RX side is easy for SSB. The base receiver and SSB generator side flies well enough to

Has anyone tried to increase the bandwidth of the ubitx filter ?? Mine is about 1650 Hz wide at the 3 ot 6 db points. I would like to get it to about 2 to 2.2 KHz wide.? I am thinking about reducing

I have made some rough measurments and found the filter to be about 1600 to 1700 Hz wide. If one wants to just the digital then the BFO frequency can be moved about 200 to 300 Hz to get the power up

This is because of how narrow the SSB filter is. Once you begin to move out of the passband your power output will drop. The filter in the ubitx is pretty narrow. It's not surprising you see a

?A? ldrich ?I would use 41 turns to start with. That way you can easily remove one turn if 41 turns is too much. Arv K7HKL _._ ? aldrich.sarmiento@...> wrote:

Ron W7HD As has been said before, the 2N3904 devices in a BITX are not going to get you on 2M with any usable power. Several have suggested using a transverter driven by a BITX. It might be possible

Mike KC2WBV, and others... The rotary encoder apparently is a bit fragile. All outputs (phase-A, phase-B, and the push-button switch can easily be damaged if 5 or 12 volts at any substantial current

Greetings, I'm about to start building a BITX40 with the dead bug style and I've noticed that the filter passes band indicates 6uH however 40 laps on a toroid T30-6 is 5.76uH, not 6 ... I mention this

Kalid Several persons have provided ways to increase power output at higher frequencies. Allison is presently working on additional ways to provide the same power output on all bands. If you go to the