|
Title: Output optimizing the BC-610E for 50 ohms Post by: Steve W8TOW on September 15, 2012, 01:57:03 PM Well, she is on the air! BC-610E SN. 826! 450 watts CW/300+ AM in to a 50 ohm
load. A solid QSO with Dave, N9WQ this morning on 75m 3885 with no sparks, arcs or farts...wow! SO, here was the solution, no diff than any other of my link-coupled transmitters: Put a small 40-500 pF air variable in series to ground with the link. The link is fully meshed, but for 75m, using about 300 pF of the cap. My control is on the left side of the rig. For 160m, I'll add a 400 pF fixed cap in parallel with the variable... Title: Re: Output optimizing the BC-610E for 50 ohms Post by: N0WEK on September 15, 2012, 06:55:43 PM I'm going to have to get going on my E model, after I figure out what I need I can sell the excess along with the I model that I got as part of the package.
What's that extra meter in the top center? If you don't have a suitable old style meter to replace it let me know the range, I've got a pile of meters that would match better. Nice setup! Title: Re: Output optimizing the BC-610E for 50 ohms Post by: Steve W8TOW on September 17, 2012, 06:16:23 PM The meter above the original meters is a volt meter to monitor
the B+. Someone installed it before I got the rig. I need to look through my collection of smaller meters (1 1/2") for a voltmeter that goes up to 5KV. This one is a 0-50 vdc with a string of HV dropping resistors in series.. Obviously that is ok too, I just wanna find a round, black one! Good luck on your 610, this one took a good 3 months to get it going but in Michigan, we don't do much indoors in the summer! 73 Steve 8tow Title: Re: Output optimizing the BC-610E for 50 ohms Post by: N0WEK on September 18, 2012, 11:29:29 AM The meter above the original meters is a volt meter to monitor the B+. Someone installed it before I got the rig. I need to look through my collection of smaller meters (1 1/2") for a voltmeter that goes up to 5KV. This one is a 0-50 vdc with a string of HV dropping resistors in series.. Obviously that is ok too, I just wanna find a round, black one! Good luck on your 610, this one took a good 3 months to get it going but in Michigan, we don't do much indoors in the summer! 73 Steve 8tow I'm on the road at the moment but I'll be home by the weekend. I'll take a look at what I have in that range that would look good, in case you don't find a suitable one there. I have WAY too many meters! Title: Re: Output optimizing the BC-610E for 50 ohms Post by: Jeff W9GY on September 18, 2012, 04:17:29 PM Steve, Sure sounded good last Sunday morning up here in the northwoods.
-73- Jeff W9GY Title: Re: Output optimizing the BC-610E for 50 ohms Post by: Steve W8TOW on September 18, 2012, 07:54:49 PM Very cool Jeff, well, my next steps include setting it up on 40 and 160m. To do so, I need to AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
go through the "tuning units" for each of those bands, get a 40m coil and add additional "C" to that output cap. Not as bad as it sounds. Additionally, I've acquired a Meissner SS with the 160m output! This way, I can drift all over the band with ease! Actually, I tested the SS for a bit Monday eve and found the thing to be quite stable. SO...little steps. Who knows, maybe I'll get rid of all my stuff and just have a BC610 and SX28? (probably not though my XYL would love it if I did... :) Well, I'm glad anytime I can put it on the air and not blow fuses... 73 Steve |