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Hi Farhan, You can see in the schema's in the Files box under PE2BS or in the Photos box how I used the trifilair transformers. The first trifilair transformer (13 wdg on an T37-43 lookalike) is

The imput impedance of the IRF510 is very low. Therefore I made the coil trifilar resulting in a lower impedance then originally. This gives more output but seems also give a better stability? I

what kind of chokes did you use? 73s - de farhan experiment this weekend. Where exactly?

hi all, looks like the instability problem has something to do with the phase of the input to the IRF510 too. can those who have tried the trifilar windings also suggest the phase used in the

Hi Ron, The decoupling was made by C's of varouis values (100 n, 22n, 47 u and 100 uf) in Vcc lines, the biassystem for the IF510, the relais for the PA, etc. See the schema in the file box (PE2BS

Thanks Ruud, Congratulations with your CW QSOs. A fantastic achievement! I will keep your hints and tips in mind when I continue to experiment this weekend. I will start shielding the driver and make

Hi Ron, I just read your message. There is something in the message I recognize: 'Found that the IRF510 has a tendency to start oscillating when set at a higher bias-level.' I had that problem

Hello BITXers I finish,last weekend, my BITX40 it works very fine... I use beads for all trifilar coils, 10 turns 0.15mm diameter wire twisted. The VFO is a HiperVXO running with 3 parallel xtals of

Thanks for reply Chris, Ja in de Zoetermeerse polder waren (kei) harde signalen in de 17 m band te horen! I think your 6 Watts RF should be fine for digimode use. Or am i wrong? I hope to experience

HI! Thanks, I made one using BC547s the gain was not very good. Will try replacing them with other transistors of higher gain. 73 Rahul VU3WJM vdberghak <vdberghak@...>

Hi, responding to the messages below: - Ron, in the Netherlands, I heard also several stations with very strong signals, form Russia but also from the States. However, the 6 watt I have on 17 mtr is

Hi! On issue of torroids if you cant buy them salvage them. A common source is defunct CFL lamps. Half bridge drivers use a torroid based transformer, I am sure Argentina must be seeing plenty of

HI HAM PALS :) IN FIRST PLACE THANKS MR EVANS FOR YOUR REPLY . SOMETIMES IS VERY IMPORTANT TO THE PEOPLE WHO LIVE OUTSIDE USA OR EUROPE TO FIND ALTERNATIVES TO TOROIDS AND OTHER ELECTRONICS

speaking about mixers, how to make it good, i got a whistling sound, farhans said its about bad post mixer signal. any tips.. rgds julius * REPLY SEPARATOR *

Fernando I used a 1/4 inch (about 6mm) wide slice of 1/2 inch (about 1.25 cm) inside diameter PVC water pipe for the 10 MHz trifilar cores. Turns used were the same as Farhan specified in his

Dear all: I slow work in a 80 mts bitx20 and i have a dude some of you made the transformer for diode mixer in no ferrite toroidal core I thin there are a picture of this in the photo section

Hi! Interesting are you using a speaker or heaphone. Secondly what transistors are you usingBC547s or 2n3904s 73 Rahul VU3WJM Ron <pa2rf@...> wrote: Hi members of the

Hi members of the bitx20-homebrew-fellowship ! Found some hours to spent on the BITX17 this Easterweekend and discovered a major mistake I made. I had connected a 2k2 resistor of Q13 between e and

Dear forum, I have a DDS ( PA2OHH's ) and want to try this as an LO of my BITX. for reason I don't need to add a frequency counter, and he PA2OHH is succeed used DDS as 5 to 5.5 MHz VFO (for an old

Hi Due to similar observations with my original BITX20, I used 1/4 inch wide slices of 1/2 inch ID PVC pipe as the formers for my BITX40. The results caused me to recently replace black plastic