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Hi! I had been interested in 6mtr and related equipment. Once again as evident by BITX concept we had no 6mtr stuff available in VU. I was much impressed with this 50mhz mega amp using IRF510.

Indeed, there you have your RF input circuitry. Not the output. Sinse BITX is a transceiver, the SBL solution looks more relevant to me. In fact, you can build double balanced mixers yourself like

Hello Ron, There is a design for a 50W V-MOSFET Linear for 50MHz in Pat Hawkers, G3VA, "Technical Topics 2000 - 2004", pages 32 - 33, which might be interesting for you. This book is a collection

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Ron The IRF510 device has an input capacitance of 180 pf, and an output capacitance if 81 pf (from the International Rectifier product datasheet). With this high input capacitance your 52 MHz

Dear David, That's an interesting idea. Just add a mixer ! Sure the SBL-1 is well capable of handling 50 MHz. Famous Signetics/Philips NE612 or NE602 could be used as well (Fmax appr. 200 MHz). This

Hi Ron and all BITX'ers You have have been reading my thoughts, my BITX20 is still at the building stage due to an Open University course which finishes in October. My thoughts were to use the

Hi fellow BITX-homebrewer, Yesterday I was browsing through some old "Electrons" (Dutch Ham magazine) and found an interesting article in which it was told that our famous MOSFET IRF-family (in

I've been reading JF1OZL article, which i myself sometimes questioned about BFO setting for USB or LSB operation, Arv K7HKL also provide me the same information about it, and this is what JF1OZL

Wise words from Julius. Several postings are related to this subject. It can be measured with a tone generator connected to the microphone connection or with the sound card of the PC. Dig in de

Hi Kumar, in my experience building a VFO, you may need to adjust number of turns on your coils to get the desired tuning range when you turn the trimmer. As for your BFO, you may need to know your

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Hello, In my bitx20 BFO shows 9.995 MHz. and in VFO section when i add 2j gang capacitor my VFO shows 4.000 to 4.180 MHz(when trimmer shifted to 4.000MHz) and after tuning Trimmer(shifted to 4.150MHz)

Hi Rob, the termination of the filter is not in accordance with Fahrans design 50 ohm. Between the mixer and the filter is a bi-amp. The mixer is likely 50 ohm so the other side of the bi-amp is

Hi Rahul, et. al., Interesting that the circuit appeared in Solid State Design. I should have been familiar with it then, but it has been a while since I read that book.

Hello! Prof Rob, Thank you for the indepth analysis on the ckt. The 2 transistor configration goes under title of shunt feedback RF buffer amplifier. First mention of the circuit Icame across in

Julius I think your red LEDs should work fine. I usually use green ones, but that is only because I purchased a bag of 100 green LEDs some time ago and still have many of them available. Arv

Hi Rahul, Your two transistor shunt circuit is quite interesting to me. It isn't one I have seen before, and so I did a little spice analysis of it and have been thinking about how it was dreamed

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Thanks Arv, this is great, i assume 5mm RED LED ( i bought several to experiment on hans huffandpuff ) would be ok. rgds julius * REPLY SEPARATOR *