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Fabio Battaglia
68 followers -
A friendly misanthrope
A friendly misanthrope

68 followers
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Built a crystal tester yesterday, to check the lot of ancient crystals I found in a box while searching other components. Hoping to find something in the range of 38.8 - 40.3Mhz for my military FSE 38/58 radios.

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A romenian military HF receiver, the R3110. No idea if this still works, but it's not in a bad shape. I'll test it as soon as I have some spare time. Interesting thing is that on this device the positive terminal is connected to the chassis. Unusual eh? #hamradio

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Flea market in Ravenna, as you get near the sea, marine radios start to pop up :-)
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Testing another old portable radio: a Kenwood TR-2200. It's a 2M FM crystal controlled transceiver.

This one has a full bank of crystals (total: 6 channels, but only a pair of crystals has the frequency written on it, 145.500).

Originally this radio had an extensible antenna on the front panel (in addition to the PL-259 connector on the back) just above the volume knob. The previous owner removed it and placed a bnc connector in the hole. Strangely enough, the outer shell of the connector was not grounded, but I took care of that.

The radio is outputting a full watt in TX, and seems to pick up my baofeng just fine during tests. I'll try it on air a simplex QSO someday.
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6/7/17
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Found another one... I guess the old Alan48s are like the Commodore64s of CB radios: everyone is fond of them but there aren't many good uses you can put them to. Maybe do a 10 metre conversion and use it in FM? #amateurradio 
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This weekend at the flea market: some replacement vacuum tubes for my radios, a vintage, grease-smelling long wire antenna, and some yet-to-identify things that I hopefully can solder on.
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A Triplett 625-NA multimeter made in U.S.A. in the late forties/early fifties.
This is a present from amateur radio operator IW4ENE +Davide Cinti. Thanks!

It lacks the 1.5v and 15v batteries so I've not been able to test it... yet.

Building the batteries out of modern (and hopefully easily replaceable) units will be a fun project.

Isn't it a wonderful item?
#vintage
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5/21/17
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Found the damn audio problem on the Motorola MC Micro: one of two ceramic (!) caps after the AF amp was shorting the audio to ground. I decided to replace both of them.

While searching for the cause of the audio mutism I tried a "shotgun" repair by replacing the old amps (M9619/M9618) with newer transistors (BD132/BD131): very bad idea, as the new ones began oscillating and got incandescent after a minute. I put the old ones back in place and all was well again.

Now the trx needs alignment to work on 432.500Mhz, as it is quite deaf. #hamradio 
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5/19/17
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Repurposing an old 1.5ohm resistor as an inductance. The ceramic core is hollow and I plan to test how the inductance changes when inserting different metal bars inside.

The resistor needed a good bath and to have the rust removed from contacts. Ready to experiment now!
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5/16/17
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