开云体育

Ola Miguel, I like to see some picts of your super VXO's Miguel. Great coverage with only 3 xtals. Is the output stable over the whole range? Do you use one or more (switchable) coils in series with

Hello I build 3 VXOs called "hipervxos" for 40m, 20, and 10m to use with BITX, They use a classic Colpits oscilattor with 3 parallel xtals and a series inductor (special) and a series variable

Guys I am planning a Huff Puff VFO kit for my 2-chip minimalist VFO see http://www.hanssummers.com/radio/huffpuff/minimalist/2chip/index.htm . I am sure that this would be suitable for use with BITX

Tnx for your reply dear Mike, I did the measurement with a Philips low-budget "world" receiver (with BFO :-) ) connected to a Celeron 266 MHz PC using MixW2.10 and I suspect this radio causing

Impressive Ron, Not a criticism, but I note some products of the VFO some distance from the carrier in the unlocked pic which are not noticable when the HuffPuff is operative due to the other

Dear Troy, Would like to inform you that I included the Huff&Puff circuit into my BITX17 (converted BITX20 for 18.068...18.168 MHz). In my Photobox (PA2RF) you can see 2 pictures of the VFO

I have tried this method and it works well with my non-BITX 5w CW transmitter. My receiver has an RF preamp and a post mixer amplifier. I found that if I grounded both transistor bases during

Those BITX builders who want to have QSK operation without relays might want to look at the web site of Miguel PY2OHH <http://geocities.yahoo.com.br/py2ohh/trx/fullbrkn/fullbrkn.htm> He shows

Troy H&P stabilisation would hold your frequency to within a Hz or two for the long term, thus minimizing even a slow drift after warm up. Hans has come up with several minimalist stabilizer designs

Thanks Arv, I've had the AFU callsign for about ten years and you're the first person to comment on it. I thought it was funny when it was first assigned to me but nobody seemed to share my sense

Now you have the benefit to read for example every day ten (for you new) postings! Often it is better to follow also what happened before, preventing that the same questions are asked more

Troy The BITX has also been used for CW. Several builders have added a center-of-the-filter BFO oscillator that serves both send and receive CW functions. I took the simple way and just added a

Hello all, I just wanted to say what a fine group I think this is. I have not built a BITX (I do mostly CW homebrew projects) but most of the topics here have been pertinet to my homebrewing. My

Hi Ray, Yes, you are right. Just QRP should have been sufficient. In fact 2 Watts represents a lot of electromagnetic RF energy. And if propagation conditions do not let you down a lot can be

Hi Ron, QRPPPP = 5mW in my book! Every additional "P"= 1/10 power level.. I worked USA and a lot of EU with 1mW + small beam.. so you are running QRO!!! Good Dx with Bitx 73 Raj VU2ZAP with an

Dear BITX homebrew-heroes!, I combined the ideas of Ruud and Alf and, to my surprise, the IRF510 is not self-oscillating anymore (at all DC bias settings) !! I did following (20 min work): Added 3

Hi to all homebrew BITX20 members, Hope everybody is having fun building their version of the BITX radio. After attending local hamfest at the end of February, collecting all the relevant

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?