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Hi Chris, Thanks for your answer. As you can see in my reply to Allison I will follow your advices. With you I hope that more pictures of the filtershape will be dropped it in this group. The

Chris My BITX40 uses 24 volts on the IRF510 for a power output of 11 watts. It required the addition of separate sheilding, 2 ferrite beads on the gate lead, and a paracitic suppressor (2 ohm 2 watt

Hi Allison, Thank you for answering my questions. I understand that changing the amplifier stage is not a good idea: variabels are depending on each other and calculate the impedence is not easy.

Hi all, did anyone tried to put higher voltage on the IRF stage? If so, I am interrested about the results like: - stability, - increase of output power. If the output power is not much higher and

Indeed measuring is knowing if the final result is in line with the original expectations. As mentioned before, it can be easily done with the sound card. At that time, I asked for feedback

de 4N1ZM I was looking in different designs of ssb trx and it looks like that most important part is exactly filter. And that is place where successful work of trx can easy fail. Crystals are

favourable candidates for a 6 m PA. The 2SC Japanes transistors are more common and most likely much easier to use. A line up of 2n4124, 2sc1970 and a pair of 2sc1971 will do 9-11W CW power at 12V

The putput impedence is affected by both the load resistor and feedback resistor value. Mismatch under 1:2(2:1) is resonable for thos application.

Hi Ruud, as I remember, you asked for a solution in the circuit, by using other resistors. I kept the circuit 'original' and added very small transformers, pictures can be seen in the BITX17 Photos

Thanks for the good info dear Allison, Yes, in the meantime I discovered MOSFET IRF's are not most favourable candidates for a 6 m PA. The 2SC Japanes transistors are more common and most likely

Allison, & others... Since the time constant in an H&P (Huff and Puff) stabilizer is usually much longer than that of a traditional PLL, a PIC-based H&P design might be quite easy to implement. I

Within the base ladder filter topology there are subgoups of type. They can designed as minimum loss, butterworth, linear phase or Chebychev not unlike LC filters. Each has it's differences

--- In BITX20@..., Jim Strohm <jstrohm@e...> wrote: > > On Jul 10, 2005, at 7:04 AM, Ashhar Farhan wrote: > > > while PLL chips are difficult to find, the 16F84 or the 16F628 are > >

Hi Paul and Max, Thanks for your info about the design of a ladderfilter. The ladderfilter was subject in this group before. Building the BITX20 I made a shape of the ladderfilter with the program

Yes Paolo, I'm a memeber of this list and just for this reason I discovered this good RTX and decided to show to other italian Hams... hi! Best 73 Alex I0SKK -----Messaggio originale----- Da:

de 4N1ZM I added older easier for understanding version of ladder filter desingn program in file section under 4N1ZM folder. design. build ARRL

de 4N1ZM There is two programs and alternative aproach to ladder filter design. Since altavista translation can overcame language bariers it is possible to check this link through systran

Dear Friends I wish to let you know that VUQRP will be making "PCB Making kit" available to VU hams who are interested in homebrewing. The price of the kits will be around Rs.325/- plus postage

MODERATOR NOTE: This message appears to be Spam - however Preethi Nair has been a member since 27-Oct-04 and in that time has only made three postings, the first two of which were radio related.

How about a PIC based Huff & Puff stabilized VFO that could also display the frequency? Arv K7HKL _._