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Author Topic: SB220 on six meters  (Read 334 times)
KC1XU
Member

Posts: 26




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« on: November 15, 2001, 07:13:00 PM »

I am looking for information on converting an SB220 to six meters.  Anyone know where I can find conversion information?
Thanks,
KC1XU
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K4VMO
Member

Posts: 11




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« Reply #1 on: November 15, 2001, 08:46:00 PM »

Several years ago, QST had an article describing this conversion.  If you are a member, you can probably find it in the archives of the ARRL.
73,
Frank  K4VMO
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WA4SSU
Member

Posts: 3




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« Reply #2 on: November 15, 2001, 09:12:34 PM »

Contact K4PI.  He has one and it works well.
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W9GB
Member

Posts: 2623




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« Reply #3 on: November 16, 2001, 09:40:45 AM »

Richard Measures, AG6K has written extensively about amplifier design and specifically about the Heathkit SB220 amplifier's design.
http://www.vcnet.com/measures/

He discusses the addition of 160, 17 and 12 meters to this popular amplifier.  I have not seen him comment on a 6 meter conversion.

You may also wish to look at the 6 meter DX Club
http://6mt.com/club.htm
http://www.ham-radio.com/n6ca/50MHz/50ops.html

A Heathkit amplifier conversion to 6 meters:
http://www.geocities.com/djdubuque/1k_amp.html

Other useful links (parts, construction & other conversions):

http://pweb.jps.net/~n4uq/

http://ac6v.com/techref.htm#AMP

http://www.harbachelectronics.com/

http://www.arrl.org/tis/info/vhfproj.html

http://www.nd2x.net/base-1.html

http://www.economyelectronics.com/

http://www.newsvhf.com/w2gn.html
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WB2WIK
Member

Posts: 20603




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« Reply #4 on: November 16, 2001, 11:09:53 AM »

I've done this conversion, myself, but did not follow any other party's article, mostly because I didn't know any existed at the time.

It's a simple conversion, but you lose 80 through 10 meters -- impossible to keep the other bands and build an effective, efficient 6m tank into the amp.  For one, the bandswitch really must go!

Results are encouraging, however.  My modified SB-220 (sold years ago to a very happy VHF'er, when I built a 4-1000A 6m amp from scratch in May 1984 -- that runs more power and is easier to drive) put out 900W with 100W drive, a tad less than 10dB gain, but was stable and performed flawlessly for years.  A pair of 3-500 cathodes just aren't that easy to drive on six meters, even with an efficient tuned input circuit.

If you don't find what you're looking for within all the excellent references already provided, let me know.  The whole conversion, assuming one has parts on hand, takes about one 8-hour day.

73 de Steve WB2WIK/6
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