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Author Topic: Eico 720 on 60m  (Read 1751 times)
W1AJO
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Posts: 108




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« on: June 06, 2013, 06:51:53 AM »

I have an Eico 720 that I use with FT-243 crystals.  I was wondering if I got a 60m crystal (say 5332 KHz channel 1) will the Eico be able to tune it correctly?  My guess is that I would set the 720 to 80m rather than 40m and do the normal tune up procedures.

Or will it just not tune?

73

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K0OD
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Posts: 2578




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« Reply #1 on: June 06, 2013, 10:08:03 AM »

AM isn't allowed on 60 because it would exceed the special 60-meter bandwidth limitation.

CW must be sent center-channel which rules out most boat anchors unless you get very lucky with that crystal and the stability of that 50 year old Eico.

I'm guessing you could get the transmitter to tune on 60 somehow.  But that's not the problem.
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W1AJO
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« Reply #2 on: June 06, 2013, 12:35:16 PM »

I'm talking CW.  International Crystals can make 60m FT-243 crystals for $25 each.  If I ordered them I would get a set of 5 for all the channels.  Before I spend the $ for the xtals I would like to know that they will work.

73
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K0OD
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Posts: 2578




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« Reply #3 on: June 06, 2013, 02:02:55 PM »

CW would have to be on 5332.0 kHz to be center channel. The new regs don't define "center channel" but current state of the art would probably allow +- 50 Hz max. What is the tolerance of those crystals and what is the drift?

http://www.arrl.org/60m-channel-allocation

I use a Flex-5000 which is accurate to better than one Hertz. Most stations I hear on 60 are right on the mark. I doubt those FT-243s are going to be adequate.

BTW, 60 meter CW is often on channel 1 for rag chewing, or Ch-5 for DXing. Yes, don't buy more than the one crystal until you learn more. Plus if that ancient rig is chirpy it's going to really stand out.
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KC4MOP
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Posts: 759




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« Reply #4 on: June 10, 2013, 04:01:50 AM »

The OP will have to call International Crystals about the tolerance. I'm sure that they will be as stable as today's radios.
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