Ashar, the link to the zip file containing the BITX40 circuit diagrams on the HFSignals site is broken. The link points to the old HFSigs site so clicking on it results in file not found error. The ci

#bitx40

Thanks to Raj for his useful advice. I have just pulled the raduino out of my BITX40 and plugged it into the USB port on my PC and voila! everything lights up the way it should so neither the raduino

#bitx40help

Yep I think I did it. I applied reverse polarity to my BITX40 from HFSignals. The power to the board was connected but no power to the PA. (The connector I used had the positive connected to the outsi

#bitx40help

I have purchased a number of products from hfsignals and from Sunil (amateurradiokits.in), and apart from the BITX40 from hfsignals which was transported in quick time by DHL couriers, I have relied o

#ubitx

Hi to all, Ordered my uBITX on December 10 (via China Post) and it arrived here in Oz on January 12. Vy 73 Kevin VK3DAP / ZL2DAP

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As a wrap up on my efforts to get the BITX20 VFO operating closely between band limits, I have done the following: 1. Adjusted the low frequency limit by turning the 10T pot fully CCW and adjusting th

Thanks Paul. I tried a 5K6 resistor across the 10T pot and the tuning range was much better. Having turned the tuning pot fully anticlockwise, I adjusted the low limit frequency to a tad under 4.0 MHz

Thanks for your help, Sarma. Will try that tomorrow. This VFO is the most stable that I have ever worked with. Can't wait to get it on the air. 73 all, Kevin VK3DAP / ZL2DAP

Building Sunil's kit. VFO completed. Lo freq = 3.957 MHz. Hi freq = 4.477 MHz. Range is a bit wider than I would like. Will look at ways of restricting the range. However the FLL makes it absolutely r

Hi Ashar and All, The all important diagrams did not come down. Fortunately I managed to get Wes's article and convert it to a .pdf, including the diagrams. It is attached. Kevin VK3DAP / ZL2DAP

I ordered on the 10th Dec (Australian time) and I got notification at 2:12 am AEDT today (17th Dec) that the package had been posted. Tracking number does not yet reveal anything, but that is par for

I am building the BITX20 with the kit from Sunil. I glued two T37-6 cores together and wound 40 turns. The inductance measures 10.06 uH. What should be the correct inductance for the VFO? (The circuit

Thanks Sarma for kindly publishing the datasheet. However, I had already looked it up and my problem was in my interpretation of it. I can follow vacuum tube and IC diagrams (I know which way round th

#bitx20help

When I look at the photo of the BITX20 Ver 3C SBL-1 board in the construction instructions, it shows an MV209 varicap with its bevelled side facing the 22 pF trimmer near the board edge. Now we are us

#bitx20help

Hi Ashar, Some of the OMs very much want a uBITX for Christmas. If the one I have ordered is about to be delivered before Christmas, I do not mind if you give my place to someone who would dearly love

Greetings all from the Southern Colonies, Is there any reason why not put a Schottky diode in series with the power supply? Sufficient current carrying capacity and low forward resistance? I have also

Greetings all, I purchased the PC boards and components for a BITX20 from Sunil, VU3SUA. I started by building a power supply centred around a toroidal tranformer with a 230 volt primary and 2 x 12 vo

I have Farhan's BITX40 V3 kit. I am wondering if I can use my vintage Geloso dynamic microphone with it. I know that I would have to use a capacitor to block the DC for electret mics, however the dyna

#bitx40help

Searching Ebay, I found a length of what appears to be some copper bus bar from Offcuts Galore. I cut a piece off the end, and what I have is a heat sink that measures 30 mm x 34 mm x 12 mm. I plan to