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Dear forum, ==About Crystal Measurements== At the time I mail to BITX about this subject, 'actually' I was using a 3.579545 MHz crystal, that available at my junkbox and drifting is in this

MILAREPA@............. It would appear from your chart that the higher frequency crystals may not be oscillating, or that your frequency counter may not be capable of counting above 10 MHz. Lets

Hello, I have just uploaded a file with the results of my measurements of the IF filters passband. The set-up was a DDS-VFO as a signal source and a HF millivoltmeter as a detector.

HI Folks, I've just found this url in a newsgroup that may be of interest to someone out there :-) http://www.qsl.net/k1jhj Using AVR's in both projects, with free development software, free

Hello from EB1CPC / EC1ACV , in Spain. I try to build the BITX20. I have the PCB but I have many doubts about the location of many components in the PCB. Can anybody help me?. Anybody send me the

Hi,why the intention to add one x-tal as a filter if you want to generate DSB? Just remove the current IF filter from the design and you have already DSB! By doing this, you can also investigate

Sorry folks, I don't know what I did wrong but the post was only intended to be sent once to three groups, not three times to this one. abject apologies for wasted space. atb Mike W

Dear forum, The problem of my crystal measurements has solved :-). Thank you for your advice :-). I try change the transistors from BC547B to 2N3904. (maybe I got 2nd grade quality of BC547B) Then

Chris, & others... Please take a closer look at the BITX IF string without any crystal filter. There would be no control of the passband and thus no way to tune a specific frequency, other than as a

I'm wondering, in a quiet, museing, sort of way, whether its a reasonable prospect to use the IF strip as a driver to VHF using a transverter in place of the PA and RX BPF. I have suitable

Arv All good points. This BITX20 reflector has been very interesting so far, and will continue to get even more interesting as the number of completed projects increases and people start working on

Hans I think that either yourself or Farhan will have to build any "group writable directory", if it is even supported by Yahoo. In building my K7HKL directories in the Files and Photos sections I

Wow !. Thanks Arv :-) vy 73 de G8NXD, Mike W --

Hi! Arv, Baseband...... This is good thinking. I was wondering on a 2.5Mhz If for BITX and 10Mhz xtal clock for detection and rest thru SDR soft. Only a couple of more diodes to add (I Q

Rahul VU3WJM That is the beauty of the BITX design. It has so much potential that it gets one to thinking about all the interesting possibilities. Here are some more "ideas" that relate to the

Arv I just had a quick look at this. With the current group settings, any member can create directories and any member can create files in any directory. What you cannot do is edit or delete an

Hi! The more I think more I am convinced that this is indeed a simple way experiment with modern techniques. If we plan to go SDR route along with downconversion then we find the critical Xtal

dear forum, as an interested reader of this forum, and beeing someone who's aiming to build a bitx in the near future I wonder if there are already people who have finished the building of this

Hi Just a quick thought regarding improving or modifying your particular BITX20 transceiver: Since the BITX design includes a 10 MHz oscillator as the BFO, it would not take much circuitry to send

Several builders are examining other bands with alternative intermediate frequencies. When doing this, it is vital to look for potential spurious transmitter outputs. Ashhar noted that this can