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Author Topic: Collins 30L-1 160 mt Mod????  (Read 4969 times)
YV5MBX
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« on: June 12, 2003, 07:56:00 AM »

Hi,
Does anybody know if it´s possible to modify the 30L-1 to operate in 160 mt band.

Thanks,
Javier
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K0BG
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« Reply #1 on: June 17, 2003, 02:03:05 PM »

In a word, NO!

It could be done as a monobander, but to add the necessary components to make it 160-10 is all but impossible.

Alan, KØBG
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« Reply #2 on: June 27, 2003, 04:57:52 PM »

160 on a 30L1?  I have one on the desk.  As usual, Alan knows nothing what he is talking about.  Add a toroid coil of about 7 uh, pad the tune vaiable about 300uuf and 1000uuf for the load cap using vacuum relays and use the 10 meter position. (I don't know why anybody needs an amp for 10 meters).  Rewind the 10meter input coil to double the 80 meter coils turns and double the 80 meter coils input caps.  You may need to experiment a little.  I get 650 watts out.
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« Reply #3 on: June 27, 2003, 05:01:00 PM »

Correction,  you need to add 7uh to the 80 meter value which means you need about 13uh toroid.
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KK5DR
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« Reply #4 on: September 07, 2014, 10:19:40 AM »

Destroy the resale value if you do mod it.
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G3RZP
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« Reply #5 on: September 08, 2014, 12:34:39 AM »

I would expect you to really need a bigger plate choke - the existing one has a reactance of 450 ohms at 1.8 MHz. That's almost 2 amps of RF in that choke, and there's not much to keep a fair amount of that current out of the electrolytics, which wouldn't like it.

As far as destroying resale value, that depends. The 30L1 I bought was very much a basket case although I didn't know it at the time - the tubes were from different manufacturers and weren't even the same mechanically in the plane of the plates was different and not such that in all of them, the plates were vertical. The feedthrough capacitors were broken and the power transformer must have been rewound as it was 240 volts only....
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