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I agree with all Jim's comments about the use of FET's salvaged from PSU's etc in power amplifiers for bands 40m or below. I always like to use "recycled" components wherever possible. But when it

Dear Forum, Suppose I plan to have some band selection in future, after 'original' 14 MHz has been set up. I just need confirmation about my frequency 'plan' table below, is this correct in the

one of the inherent problems with 10 MHz if is that it precludes the 10 MHz band. the IF will fall within the RF passband. it might work if you used 14.318 MHz crystals for IF and used the 4 MHz vfo

Hi, at this moment I spend hours getting the filter working for the IF frequency of 4.9152 MHz. It is importand that measurements are done with the circuits connected, it seems that the load

Hi all Looking at the PA diagram it is indicated that from the antenna there are two inductors L1 and L2 but the details below indicate L4 and L5. Can anyone confirm that L1 = L4 and L2 = L5 73

Hi Arv Thank very much for the spread sheet ... This is something that I will demo at the club during the sessions on the building of the project .. 73 Charles G4VSZ

In the "files" section of this forum I have uploaded a small spreadsheet program called "RESONANCE CALCULATOR.xls". This is a spreadsheet program that helps calculate inductance, capacitance,

I found it (surprised myself). It's now in the file section in a folder named "hp_parts_xref". Six .gifs, all about 250K. I found these files on the internet a few years ago and as far as I know

Builders are reminded that while the IRF510 final may be a little hard to find and may be a little expensive, many other power FETs will amplify quite nicely on lower frequencies, . In the late

All components arrived here today. I have counted them all out into the component packs and despatched them. Note that I have two spare packs, if any latecomers would like one: price is ?8 + ?0.28

Felipe I first buiilt the BITX20 and am now working on a BITX40 version. That way I can compare DC voltages and RF & AF signals with a working unit as I complete the 40 Meter version. Here are some

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

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 -

Hi, to this kind of filter can be made with several x-tals. For SSB usualy x-tals above 10 MHz are used, however, lower is also possible. The lower the x-tal frequency, the smaller the capacitors

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

Note that I have 20 spare 10MHz crystals, from my components order. Price is ?2.23 for 10 crystals, plus postage at cost. 73 Hans G0UPL http://www.HansSummers.com

Please I do not have the 10MHz crystals to make the filter, but I have 5 pieces of 8MHz crystals with this 8MHz crystals is possible to make the filter with new values of resistor and capacitor?And

Hi All I rather agree with Mark - I have done a lot of construction in the past and the absence of such info takes a long time of searching for a fault. AND It will make great testing and fault

Here are my measurements in ascending order: 9,994,677 9,994,704 9,994,733 9,994,747 9,994,799 0 9,994,811 +12 9,994,821 +22 9,994,829 +30 9,994,874 9,994,887 You can see the chosen 4,

- farhan wrote: i am convinced that we need to add detailed test measurements for the transceiver on the site. i have most of them in my log book. i will post them soon. I would welcome test