Thanks Pat & others who wrote concerning how I use a Ranger to drive an SB-220. Here is a list from my archives of things I tried.
1. The much touted pot to crank down the screen voltage. Simple, easy mod. Use a non conductive shaft, bring it out through the hole in the crystal socket and you can still insert a crystal, pot the cap back on and crack it all the way up when you want to. 2. Simply using less grid drive when tuning up the Ranger, bad idea, my linearity goes to hell. 3. Built a 3db attenuation pad with a hand full of one watt resistors, a couple of coax connectors a box and a switch. "Got way too hot" 6. Built a 6db attention pad with a hand full of 5 watt resistors, a couple of coax connectors a box and switch. "Found the sweet spot" 7. If you don't want to build an attenuator or mod the Ranger, surplus attenuators are plentiful and on eBay, Surplus sales of Nebraska and I am sure countless other places. All the Best Ron Weaver W6OM www.qsl.net/w6om -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Patrick Thompson Sent: Monday, February 11, 2008 4:37 PM To: 'Discussion of AM Radio in the Amateur Service' Subject: [AMRadio] Ranger driving SB220 How did you go about getting the RF drive from the Ranger down to a level usable by the SB220? I'm thinking about something similar to get to the 200-250 watt carrier level (or 800 to 1000 pep AM). I'm guessing the amp won't need much more than 10-15 watts drive (40 to 60 watts pep AM) leaving a little headroom. I thought about a homemade pad but that's a lot of heat to throw away. Maybe a 3db pad and turn the drive down a little? I could lower the screen voltage but it would be nice to have the rig full power when barefoot. Can you get by with just lowering the drive and microphone gain? Pat wa4tuk -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of W6OM Sent: Monday, February 11, 2008 12:10 PM To: 'Discussion of AM Radio in the Amateur Service' Subject: RE: [AMRadio] Using Heath SB 610 Monitor Scope to monitor modulation on AM transmitter John The SB 610 monitor scope is one of the best all around performers for the money you can still buy today. I have two, one connected to the plate of the 2nd IF on an NC 300 for monitoring the incoming signals and for transmit it monitors a Ranger driving an SB 220 on AM. <snip> No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.516 / Virus Database: 269.20.2/1272 - Release Date: 2/11/2008 5:28 PM ______________________________________________________________ Our Main Website: http://www.amfone.net AMRadio mailing list List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:[email protected] To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body. ______________________________________________________________ Our Main Website: http://www.amfone.net AMRadio mailing list List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:[email protected] To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
