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Hello fellow BITX'ers, Because I want do do some experiments with a ladderfilter on 9 MHz, I studied the amplifier stage Asshar discribed and used in his BITX20. I have some questions about it. -

For the ones thast do not understand the Dutch language: Arkan has a lot of noise. Disconnecting Q4 from the LM386 makes it disapear. My suggestion is that he locates where it is comming from by

Hallo Cris potmeter regelt het audio prima maar als ik deze helemaal los draai komt er veel ruis uit de luidspreker dit komt door transistor q4.Als ik ic1 alleen spanning geef heb ik dat niet.Als ik

Arjan, I do not understand what you ask. You may try it in the Dutch language. Ik begrijp dat je vraagt of het normaal is dat er veel ruis uit de ontvanger komt. Aan je vraagstelling maak ik op dat

I have a question I the reception rx working of my BITX20 only I well many noise on my audio this normal? can someone help me? greeting Arjan pe1abe

Thanks for your helpful coments, Rahul. You are right in the DDS issue, the PLL chip could be dificult to find. I don't like DDS for the noisy output, but I am not tested this and I am not make a

Try to change transistors.2sc2571a or bfr96 bfr91 or any other with ft of 5 ghz. There is big chance that capacitor values in crystal filter are not appropriate. Even behavior of the crystals in

Hi! Manuel, It is not that we missed your work in fact we looked at it with great interest. I was interested in a PLL design for VFO for long. My opinion by using a PIC we complicate things. Now a

Hi! Prior to winding add a layer of white plumbers PTFE tape. Very thin and highly effective. Another item in BITX list while shopping for Tap washers Hi! Hi! 73 Rahul VU3WJM Raj

Chamfering the edges with a bit of emery or sand paper will also work. 73 Raj

I want to contribute the comunity with my work and that you not missed the earlier post. I don't want recognition, I only want to ear coments about the circuit from more experienced hams, I am

Hi Manuel, Just had a quick look at the photo's and the C-Code source, congratulations, excellent work, I will have a closer look as soon as I have some free time, my BITX20 is using

Hi Paolo, also in the (no longer exsisting) 'RAM' (Radio Amateur Magazine) was the circuit discribed. That author is subcribed to the list (its me ;-) No exact component details were given, only the

Hi Manuel, perhaps, it is because that topic should be in the huff and puff yahoo group? http://groups.yahoo.com/group/HuffPuffVFO/messages Chris.

hi and greeting from UK. I must have missed an earlier post on this .... All developments of the unit I am watching but at the moment other club matters have slowed my progress ..it happens when you

Sorry, but realy nobody is interested in my PLL project?? It is MC145170 and 16F628 based. It is working 100% in BITX. I post the schematic, photos and the C source code of working beta in the files

Hi, I just discovered that a series of 4 articles about BITX20 has been published on the Italian magazine "RadioKit Elettronica" (03/2005 to

a bit of insulation tape on the core will certainly help matters..... &#92; mm ali vu2ali Quoting Ashhar Farhan <farhan@...>:

the problem with balun is that it has a sharp edges. these edges nick the enamelled wire being passed around. and the wire gets scrapped and touches the core. if more than two wires get nicked, they

Guys I am building a BITX and have the rx working very nice. However, there is a problem of microphics around the detector/af amp. Ceramics replaced, as per past postings. No change. I have now traced