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Title: New TX by IN3IEX Post by: IN3IEX on December 30, 2011, 04:20:49 PM Here we have a homebrew TX just finished:
Geloso VFO 4/102 and dial scale Geloso modulation transformer 6055 Geloso PI coil Geloso 1500pF Load variable capacitor VFO adopts 6J5, 6AH6, 6L6. QB3/200 Rf power tube 1.2kV anode voltage, 130 mA typical anode current. Tubes in the modulator are 12ax7, 5687WA, 2 * 6KM6 audio power tubes 600 V anode voltage. There are semiconductor diodes in the power supply and a voltage regulator IC for the relais, the fan and the panel lamp. There is my anti overmodulation circuit. (see here http://www.ing.unitn.it/~fontana/AM%20ALC.pdf and look for updates). Four meters: Ig, Ia, RF, %mod. Relatively compact design 100 W carrier out Six fuses (most important...) Title: Re: New TX by IN3IEX Post by: KA8WTK on December 30, 2011, 04:48:40 PM Nice Job!
Title: Re: New TX by IN3IEX Post by: W2PFY on December 30, 2011, 04:53:42 PM That is beautiful. I wish I could build like that! Could you post some pictures of the inside?
good luck with it! Terry Title: Re: New TX by IN3IEX Post by: Todd, KA1KAQ on December 30, 2011, 05:07:42 PM Nice transmitter. Very well thought out, laid out, and constructed. From those photos, it could pretty easily pass for a piece of commercial equipment.
Title: Re: New TX by IN3IEX Post by: KB2WIG on December 30, 2011, 05:15:04 PM Shazam! Title: Re: New TX by IN3IEX Post by: Lou W9LRS on December 30, 2011, 05:20:06 PM John Geloso would be proud. Nice Job
Title: Re: New TX by IN3IEX Post by: Steve - K4HX on December 30, 2011, 06:19:01 PM Wow! Beautiful!
Title: Re: New TX by IN3IEX Post by: WA1GFZ on December 30, 2011, 08:41:35 PM VERY NICE JOB!
Title: Re: New TX by IN3IEX Post by: Opcom on December 30, 2011, 08:56:03 PM Looks better than most!
Title: Re: New TX by IN3IEX Post by: K6IC on December 30, 2011, 10:01:24 PM WOW!! looks teriffic, actually, it is magnificent!
Fine work. Vic Title: Re: New TX by IN3IEX Post by: w3jn on December 31, 2011, 12:38:27 AM That is a true work of art following the Geloso tradition. Thanks for sharing - and yes, how about some pictures of the inside?
Title: Re: New TX by IN3IEX Post by: WA2TTP Steve on December 31, 2011, 01:11:45 AM You can sure be proud of that rig. Nice work!
Title: Re: New TX by IN3IEX Post by: IN3IEX on December 31, 2011, 04:42:39 AM More pictures attached.
Dedicated to John Geloso, he produced the components but never made a 100W out AM transmitter. Many thanks to Luciano I8KLL for inspiring this work and for his advice. Many thanks to Tony I0JX for Geloso documentation, dial scales and many useful discussions. Related info: Knobs: http://www.ebay.com/itm/50pc-Radio-AMPLIFIER-Test-HiFi-Volume-Knob-tune-control-/320657411244?pt=Vintage_Electronics_R2&hash=item4aa8abccac#ht_3776wt_1159 Power supply: http://www.ing.unitn.it/~fontana/Comparing%20Half.pdf Low cost QB3/200 http://www.ebay.de/itm/QB3-200-Tetrode-Valvo-NOS-NF-HF-Rohre-Valve-Tube-Lampe-/290636941171?pt=LH_DefaultDomain_77&hash=item43ab4fc773#ht_2302wt_905 Title: Re: New TX by IN3IEX Post by: IN3IEX on December 31, 2011, 09:08:45 AM ..
Title: Re: New TX by IN3IEX Post by: W1RKW on December 31, 2011, 10:47:21 AM Absolutely beautiful inside and out! AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
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