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paul, the PCBs have been printed component side! to mark the correct side, i had put the letters BITX in the middle of the PCB as a reminder so that it reads properly. I guess the fault is partly

---------- Forwarded message ---------- Date: Sun, 23 Jan 2005 13:43:05 -0500 From: paul daulton <k5wms@...> To: farhan@... Cc: farcir@... Subject: Assembling Far bitx

Hi! Here we have completed 2 BITX 20s. We used the ver. 2 layout for PCB. PCB is thankfully without any mistakes however Pin 2 of LM386 also needs to be grounded to ground plain nearby to avoid

Kumar Please see message 102: http://groups.yahoo.com/group/BITX20/message/102 for some details of the tap washer I used. I bought some samples of ordinary "1/2-inch" tap washers and "delta" tap

hello, any one help me for bitx-20 tap-washer, it's size , it's thikness and it's inner and outer length. if any one have details in this regard then please help me. with 73's de kumar

What you also can do after following the advice of Arv, is combining the tap washers to a bigger thickness. If the diameter differs a lot from the normal dimension, it would not make sense but is

FYI... Here in the US, tap washers (i.e. faucet washers) come in various sizes, from over 1 inch OD down to less than 1/4 inch OD. For my first BITX20 I used those that were for bathroom basin

Fixed value coils can not be used for this application. Regards, Chris. efficient?

Hello Everybody Yesterday I have almost finished my BitX - mainboard. I have etched pcb board. I have only problems with tap washers, I bought a pack of 20 deferent tap washers, wound a coil and

I received two main boards from Far Circuits yester day Jan 8,2005 excellent workman ship, well worth the money. Dave w5dsb and I plan to build two rigs for 40 meters. Will post pictures when

Far Circuits is offering the BITX20 PCBs. http://www.farcircuits.net/tcvrs1.htm - farhan

Hello everybody, I entered in this group because I have build last year the 2-band transceiver published by Farhan in 2003. It is still on his homepage, I hope. I used transistors etc. that I had in

Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the BITX20 group. File : /audioAGC.bmp Uploaded by : pa0huy

Following correspondence with Frank K0IYE I am now also hosting his wonderful homebrew book on my website

Farhan & others Have you seen the free online book "Crystal Sets to Sideband" by Frank W Harris K0IYE, at http://www.qsl.net/k3pd/book.html ? This is an excellent book, well worth paying for if

Farhan, I agree with what Arv has said about the stabilisers. The 2-chip works nicely and easily. The 1-chip can be made to work, but it takes more careful choice of component values. You could

putting a diode as a variable emitter degeneration will change the nominal impedances of the stages. this will result in impedance mismatches and it will effect the passband of the ladder filter as

Dear Farhan and friends, Hi! I view of simplicity I feel AF dervided AGC would be easy to impliment. A PIN diode type would take care of not upsetting the bias of the stages. I suggest simply

I would love to see a good AGC design. Most of the workable AGCs are really complex beast. Probably as complex as the entire BITX20. A cursory read of some AGC texts like the ARRL Handbook or EMRFD

Has anyone an interesting idea (or schematic) for an automatic gain control (AGC) that is 'in line' with the BITX design? Hints what can be used without integrated circuits? (only transistors