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New TX by IN3IEX




 
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Author Topic: New TX by IN3IEX  (Read 7277 times)
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IN3IEX
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« 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...)


* BaglioreQB3_200.jpg (65.9 KB, 800x600 - viewed 644 times.)

* Frontale.JPG (77.75 KB, 800x600 - viewed 706 times.)

* GIFdialscale_4_101_102.GIF (219.91 KB, 2462x1471 - viewed 735 times.)
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KA8WTK
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« Reply #1 on: December 30, 2011, 04:48:40 PM »

Nice Job!
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Bill KA8WTK
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« Reply #2 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
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Todd, KA1KAQ
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« Reply #3 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.
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KB2WIG
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« Reply #4 on: December 30, 2011, 05:15:04 PM »

                                       


                                                      Shazam!
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Lou W9LRS
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« Reply #5 on: December 30, 2011, 05:20:06 PM »

John Geloso would be proud. Nice Job
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Steve - K4HX
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« Reply #6 on: December 30, 2011, 06:19:01 PM »

Wow! Beautiful!
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WA1GFZ
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« Reply #7 on: December 30, 2011, 08:41:35 PM »

VERY NICE JOB!
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Patrick J. / KD5OEI
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« Reply #8 on: December 30, 2011, 08:56:03 PM »

Looks better than most!
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K6IC
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« Reply #9 on: December 30, 2011, 10:01:24 PM »

WOW!! looks teriffic,  actually,  it is magnificent!

Fine work.  Vic
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w3jn
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« Reply #10 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?
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WA2TTP Steve
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« Reply #11 on: December 31, 2011, 01:11:45 AM »

You can sure be proud of that rig.  Nice work!
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IN3IEX
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« Reply #12 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


* Sotto.jpg (123.2 KB, 800x598 - viewed 828 times.)

* PICT0158.JPG (320.57 KB, 2554x924 - viewed 542 times.)
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IN3IEX
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« Reply #13 on: December 31, 2011, 09:08:45 AM »

..


* topcompleted.JPG (75.11 KB, 800x600 - viewed 827 times.)

* QB3-200.JPG (48.71 KB, 800x600 - viewed 698 times.)
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W1RKW
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« Reply #14 on: December 31, 2011, 10:47:21 AM »

Absolutely beautiful inside and out!
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Bob
W1RKW
Home of GORT. A buddy of mine named the 813 rig GORT.
His fear was when I turned it on for the first time life on earth would come to a stand still.
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