Hi All, Just to clarify, the Delta Washers I mentioned in the earlier post are shaped more like a standard Torroid a little bigger than a T 50 and not as big as a T68 so I guess around a T55????? A st

Hi I uploaded my BITX20 pictures into the photographs section http://photos.groups.yahoo.com/group/BITX20/lst I also re-organised in there a little, so that the photos which were at the top level ar

I've been using ugly-style construction, which has worked quite well. I've noticed a bunch of constructors have used Manhattan- style construction. Not being willing to leave well enough alone, I wa

Hi! Has anyone attempted to list all BITX20 components? I haven't found any link on Ashan's page. Here is my attempt at listing all components, except for the IRF510 PA (had no time). Please warn me

Hello, I have uploaded a photo of a two-hole "binocular" ferrite core (see G4DFV album). Ashtar, please can you tell me if this is anything like the TV balun that you have used? My core measures 13m

for the last 48 hours, groups.yahoo.com has been blocked out by the two major bandwidth providers to india. most of my internet accounts belong to isps that in turn take their bandwidth from either of

BITXers Since the tap washers, faucet washers here in the US, are mylon or similar plastic type material, it would seem that they do not contribute much to the functionality, other that to hold the w

...in which G0UPL travels to his local hardware store to further investigate the nature of the infamous tap washers, and in particular the differences between ordinary and "delta" washers. Samples wer

Sam & other BITXers Your measurements explain my results then. Instead of tap/faucet washers I used 1/4 inch slices cut from "1/2 inch" PVC pipe (the schedule-40 or medium-thick-wall type). These m

Hi I have just posted a block diagram of the BITX - I hope I have correctly identified all the section of the main schematic diagram. Let me know of any errors. This will be used as part of a tea

Hi I was wondering how to make a pad for the chip then thought use a piece of PCB with a cut through the copper in the centre and then additional cross cuts of the copper to make the lands for the

Hi all Looking for some help here. Testing the RX today, AF amp clearly OK, the simple tests in the text work out fine i.e. Touch base Q4 static, Q3 more static, Q2 less static. Trimmers with L1,2 &

Hi fellow builders, posting this link for information http://www.wia.org.au/armag/2002/AR_Sept02_Digital_Freq_Display.pdf - its a digital frequency readout using a PIC micro with user definable IF off

BITX'ers, DEADLINE: 12:00 UTC THURSDAY 01-JUL-04 (TOMORROW!) Paolo, Farhan and myself are investigating the possibility of a complete kit of all parts for the project, including resistors, capacitor

the shape is easy to figure out if you already know the crystal parameters. the crystal parameters are easier to measure now thanks to the G3UUR method. i have outlined it at http://www.phonestack.

Hello, I just measured the resonance frequency of ten 10 MHz crystals. I found a set of four within 30 Hz and another set of four within 45 Hz. How does this compare to other peoples results? Di

Hi, I build some parts of the transceiver and tested every part individualy. The LF parts works fine (a pitty the schematic is not corrected with the voltage/output of the lm386). If I add a sinus L

The order for the 2nd round of components is now in. With any luck, they arrive tomorrow and I despatch them to you tomorrow. Due to a shortage of 2N2219 at Viewcom I ordered the real 2N2218 from Mode

BITXers There are several alternative ways to build various parts of the BITX design. For my BITX40 I chose a PTO type oscillator for the VFO. This uses a layout similar to that done by Jom - WA6OT

Ashtar, I have followed the link to your site:- www.phonestack.com/farhan and the schematic around the LM386 still looks the same as before. Duncan G4DFV