Good on ya Dave re 630 Meters. I am in the process of getting on that band myself using my BC-191 and it’s low frequency tuning unit. I’ve tested it into a 50 ohm dummy load. In order to get it to load to its rated 190 ma plate current on CW I had to add about 2000pf parallel capacity across the transmitter output. Doing so raised the max loading plate input from about 125 ma to 190 ma, and the RF wattmeter at the dummy load from 25 watts to 50 watts. The wattmeter is just a Heathkit HM-102 and it’s calibration is certainly suspect at such a low frequency. TM 11-800 states rated output at low frequency and HF is 75 watts at a nominal 190 ma plate current.
If you haven’t already, check out 472kHz.org, lots of great information references and links to all things 630 meters. CW on the band generally in the vicinity of 472-474 kHz.
73 de Chris AJ1G
Stonington CT
Sent from my iPhone
ARC-5 on 630 Meters.Been meaning to try this for a long time.Since I'm not allowed to pick-up anything heavyand am on leave to recoup, I got working on this.My AN/ARC-5 set has the goodiesfor the T-15 T-16 T-17 MF transmitters.https://photos.app.goo.gl/PhueH4gcrP4BWyQ8A(Yes I forgot to change the RX Control Box dial.)The T-15 will indeed easily go down to 470 KC.Mesh the Oscillator cap, leaving about a 25 degreeangle unmeshed. 472 KC will be at about 505 KCon the dial. The Plate trimmer on mine resonateswithin the range of the set screw. It's makinggood power, though I can't measure it (scope probebroke), but it will light-up a big florescent bulb fully.None of the TN-6 loading was used, but did likethe little neon bulb ;-). The TX roller coil was at abouta third, link at about 80%.Here is the signal (to a very poor substitute antenna)keyed in CW mode with the microphone button.received on an SDR receiver about 30 miles distant.Lots of QRN:https://tinyurl.com/58ywxdt7Here's a Video:https://tinyurl.com/mru6cd52When the docs let me do more, I will replace my storm-wrecked "Titanic Antenna" and make some contactson CW. Gonna be cool.GL OM DE Dave AB5S-- This email has been checked for viruses by Avast antivirus software.https://www.avast.com/antivirus______________________________________________________________ARC5 mailing listHome: http://mailman.qth.net/mailman/listinfo/arc5Help: http://mailman.qth.net/mmfaq.htmPost: mailto:[email protected]This list hosted by: http://www.qsl.netPlease help support this email list: https://www.qsl.net/donate.html