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Title: Modulation Transformer ID Post by: KE6DF on April 29, 2010, 12:08:45 AM Does anyone know anything about the transmitter this modulation transformer comes from:
http://cgi.ebay.com/HIGH-POWER-120-WATT-MODULATION-TRANSFORMER-/370369562983?cmd=ViewItem&pt=LH_DefaultDomain_0&hash=item563bbf0967 There have be a few of them for sale on ebay recently. Title: Re: Modulation Transformer ID Post by: KE6DF on April 29, 2010, 12:28:38 AM OK, I tracked it down myself.
It's from a GRT-3 air ground station VHF transmitter. 100W output 811's modulating a 4x150a 1950's ventage. Turns out bama has a manual. I would delete this topic, but I can't figure out how to do so. Title: Re: Modulation Transformer ID Post by: The Slab Bacon on April 29, 2010, 08:27:02 AM I picked one of those up at Berryville about 4 years ago for $2. We had a discussion a while back on here about it as W9LBB??, I think had one for sale.
Title: Re: Modulation Transformer ID Post by: N4LTA on April 29, 2010, 08:57:30 AM I live about 20 miles from the seller. I sold one about 12 years ago at the Shelby fest that I took out of the SPA airport communication system when they removed the equipment. Might be the same one.
I wish I had it back. Title: Re: Modulation Transformer ID Post by: WA1GFZ on April 29, 2010, 09:18:40 AM Hey, I have one also. Pretty large for 100 watts. I tried it on a Viking 2 once
Title: Re: Modulation Transformer ID Post by: W2PFY on April 29, 2010, 10:08:29 AM Quote I would delete this topic, but I can't figure out how to do so. I'm glad you didn't delete it. I have one of those that's on an old DX-100 parts rig. Now I know what it is. I wonder what terminals 6-7-8 were for? Maybe to modulate a screen or to use as a driver for a class ab1 audio amp? Thanks ;D ;D Title: Re: Modulation Transformer ID Post by: KE6DF on April 29, 2010, 10:54:27 AM "I wonder what terminals 6-7-8 were for?"
They are used for a limiter circuit. See attached pages from the manual. Title: Re: Modulation Transformer ID Post by: WA1GFZ on April 29, 2010, 11:12:36 AM How much output power did this rig run?
Title: Re: Modulation Transformer ID Post by: W2PFY on April 29, 2010, 11:29:30 AM Just downloaded the manual. The output is 100 watts 52 ohm load. Over
Title: Re: Modulation Transformer ID Post by: WA1GFZ on April 29, 2010, 12:29:25 PM I suppose that is MIL CCS watts not chicken band watts.
I bet that transformer would be nice in a Valiant. Title: Re: Modulation Transformer ID Post by: W2PFY on April 29, 2010, 02:53:57 PM It probably would run 24/7. It had an interesting 4 bay antenna the likes of which I never seen. AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
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