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Title: Hammarlund Four 20 Tank Coil - Info. Needed Post by: W4LTM on August 17, 2005, 11:37:29 AM Hi gang,
I am hoping someone can provide me with a photo of the correct tank coil (80 Meters please) for the Hammarlund Four-20 transmitter. I have been using end-linked coils and the radio works, but I would like to see what should be in there. The coil uses a 5 pin socket and has an adjustable link. 73, Matt Title: Re: Hammarlund Four 20 Tank Coil - Info. Needed Post by: Vortex Joe - N3IBX on August 19, 2005, 09:24:38 AM Matt,
Is it a 5 pin round (807 style) socket, or is it a 5-in-line type? To my knowledge, Hammarlund didn't use anything special with the 4-20; and it's probably a proprietary type coil. Regardless of which type it is, I have plenty of both I could give you the data from. Regards, Joe N3IBX Title: Re: Hammarlund Four 20 Tank Coil - Info. Needed Post by: Vortex Joe - N3IBX on August 19, 2005, 09:26:41 AM Matt,
One more thing: Do you want end linked for the oscillator and center linked for the PA? Title: Re: Hammarlund Four 20 Tank Coil - Info. Needed Post by: W4LTM on August 19, 2005, 10:38:17 AM Matt, Is it a 5 pin round (807 style) socket, or is it a 5-in-line type? To my knowledge, Hammarlund didn't use anything special with the 4-20; and it's probably a proprietary type coil. Regardless of which type it is, I have plenty of both I could give you the data from. Regards, Joe N3IBX Hi Joe, The coil I am using is a 80 JEL B&W (end link). It fits the circular 5 pin socket. I modded my own out of the 80 JEL by cutting the inside link (secondary L2) at the socket and adding a wire tap. It works, but I really want to know what Hammarlund used - myself and another Four-20 owner want to see a photo or at least see the information on the correct (or proprietary) coil. The ad in my 1948 handbook states: "A tap on the output coil assures a match between the output of the transmitter and any transmission line." Not much to go on... I guess I am a bit anal here, but my Four-20 Transmitter and Four-11 Modulator are in great original condition and I would just like to have an original coil for the transmitter. Thanks, Matt Title: Re: Hammarlund Four 20 Tank Coil - Info. Needed Post by: W1GFH on August 19, 2005, 10:57:10 AM Hammarlund 4-20...cool, very buzzardly rigs. Bought one (w/4-11 modulator) for $20 at Deerfield one year. It was also missing its coil set. Sold it for $20 the next year. Wish I hadn't. AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
How about posting some photos? |