Have the box and a blurry schematic, looking for a complete manual, or at least some information.
How much drive does the exciter deliver? Is it 50 ohms?
Questions tell me, you have not worked around AM Broadcast transmitters of this era.
In addition, this model did not have a long production run (2 years), used a 100 watt exciter.
Contact Mike Monnier, W8BAC or Greg, K9QI --
http://amfone.net/Amforum/index.php?action=dlattach;topic=33349.0;attach=36325
IF you need details on $$ and time for Vanguard conversion work/restoration.
A matching network needs to be built, etc.John, K5PRO may have a copy of the complete Vanguard II manual (for station engineer).
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http://amfone.net/Amforum/index.php?topic=18318.0The Gates Vanguard II is a 1 kW AM broadcast transmitter (550 - 1700 kHz)
that used the 4CX3000 tetrode RF tube. It used a first generation solid-state exciter (100 w)
and had a Built-In Dummy Load !
It was built at the Gates/Harris plant in Quincy, IL only from 1966 to 1968.
The Quincy Amateur Radio Clubs have a number of retired Gates employees,
so that is a good place to start.http://www.oldradio.com/archives/hardware/gates-tx.htmThat rack was about 29 inches wide, 78 inches (6-1/2') high, and 30 inches deep.
It weights 700 pounds !
Power: 230 VAC, single phase, 3-wire. There were SPECIALS (208 V), so you have to check.
These units were NOT efficient, as I remember/heard -- as low as 30%Going to need a good electrical feed !
The Vangaurd II is shown on page 16 of the 1968 Gates Catalog (red cover)
http://www.americanradiohistory.com/Archive-Catalogs/Gates-1968-Harris-No-98.pdfThe Vangaurd II model is NOT shown in my 1971 Gates Catalog (green cover).SUGGEST you talk to Phil Alexander, Barry Mishkind, Dave Riddle, AMFONE.net, and
oldradio.com for Gates transmitters of this era.
http://www.oldradio.com/archives/hardware/Gates/Vanguard.htm===
Mike, W8BAC took on the project of the earlier Gates Vangaurd model restoration/conversion.
http://www.w8bac.com/vanguard.htmlGood match for my GATES Gatesway II Audio Console.
It would be a good candidate as a dedicated 160 meter AM transmitter, with 2 crystal selection.
