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Hi all, the information that I posted before, does contain a major mistake! I was forgotten that the 10 dB attenuator was still connected while measuring the output of Q14. So the output was not 0,3

Hi! Some real efforts made there in labeling all components in original BITX layout. It appears the RIT is indeed the fine tune control. Very true the Rx front end device indeed determines the

Manuel - EB7HPM Thank you for the quick reply. I had noticed the notation of "RIT" on the top-left of your PC Board image and took that to indicate that you had a new way of doing that function.

I'm sorry, but muy rig doesn't have RIT, although I hope soon to have it. However you can try some configurations. I remember one with suming AO. You can take it from here:

EB7HPM The new PCB layout looks interesting. How did you design the RIT circuit? Could you upload a schematic of the RIT part of your unit? Thanks, Arv-K7HKL

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 : /BITX PCBs (Printed Circuit

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 : /MODIFICATIONS/BITX DC Switching.png Uploaded by

Chris I will be glad to share what I have done, but my spare time is a bit limited right now (I am in the midst of being hired for a new position...un-retired for the third time!). Sharing will

Hi Arv, why not sharing the circuits that you use and explain why they are better? Or did you already had them from other projects? ;-) Chris. because my Farhan's

Hi! Yes yes yes very helpful indeed. The data put up by our good old Rev indeed had my brain kicking. I straight away planned a K2 discreet version. If one goes over the design carefuly one would

Friends On the GQRP web site <www.gqrp.com> you will find a number of useful tables, including one on using TOKO coils for bandpass filters. * Quick and Easy Bandpass Filters for Receiver

Chris Re higher readings at output of the mixer: I used a diode detector (0.001 series capacitor to a Germanium diode to ground, with a .01 bypass) feeding into the 11 Megohm input of an old Heathkit

Hi all, some additional measurement results (all loaded with 50 ohm): - The output power of the oscillator is about 3 mw. While measuring the output after the first mixer and increasing the LF level

have 150mw? Yes, I have. By the way, the transistor I use is a 2N2219 but this makes no difference. I will check this again. I remember that it was very little, I remember I was suprised about

Dear Friends, While going thru my old files I found this small text giving turns vs inductance for TOKO coils ( Uploaded under files). This is not my work but of an unknown person to whom I am

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 : /tokoturns.txt Uploaded by : vu3wjm

Rahul I just used the scope to set up levels for the best looking DSB signal. But you are right...we probably need to specify the proper ratio for AF versus carrier level. That would help those

SANDRO There is an error in the info I sent you. I apparently transposed the voltage readings for Base & Emitter of Q10. The correction is shown below: DC Voltage Measurements: Q10

hello friends, chris, in the exit of the 2n2218 (driver, correct?) is it that you have 150mw? and in his entrance? Are 150mw enough for exciting the irf510, to 6watts????

Hi! From what I remember from my yester years of setting the diode bal Mod ( In my SB 102) idealy the AF signal level should be 1/10 of carrier level. ( A thumbrule I guess). I may be wrong but