Bird makes (or made?) a model 4410 wattmeter that will do what you want. It looks identically to a model 43, except it has a single knob "range" switch on it. The "ranges" depend on the slug in use. Mine has a 1 KW max. 2-30 Mhz slug, which yield ranges from 0-1 watt to 0-1000 watts with a 1 and 3 scaling scheme. (1-3-10-30-100-300-1000 watts in this case). Very handy for low power stuff. VHF/UHF elements are available for it that go down into milliwatt ranges. It has a built in solid state amplifier that is run by a common 9v. transistor radio battery. They ain't cheap! When I bought this one years ago it was around $500 less elements. The elements were around $100 each at that time. I only have two elements for it. 1 KW 2-30 mhz and 1 kw 144-520 Mhz. (Both give the 1 watt to 1000 watt full scale ranges as per note above.) I sure can't afford to buy elements for it now! (Was using it on the job when I bought it so it was a "tool" expense for income tax purposes.) 73, Sandy W5TVW ----- Original Message ----- From: "Arthur Delibert" <[EMAIL PROTECTED]> To: <elecraft@mailman.qth.net> Sent: Friday, February 03, 2006 10:26 PM Subject: [Elecraft] Modifying Wattmeter Slugs for QRP
| I have a Bird wattmeter that I'd like to use with QRP rigs. As best I can tell, though, Bird did not make slugs smaller than 50 watts for the 2-30 MHz range. | | There is a website that discusses how to open a Bird slug and modify it for a different power level and/or frequency range. [http://www.hayseed.net/~jpk5lad/BIRD%20Slugs/birdslug1.htm] | | I'm wondering if anyone has tried to modify, say, a 2-30MHz/50-watt slug for 10 watts and if so, any experience to share? What was the right resistor value? How was the linearity of the meter with the modified slug? | | Thanks for any experience or insights. | | Art Delibert | KB3FJO | _______________________________________________ | Elecraft mailing list | Post to: Elecraft@mailman.qth.net | You must be a subscriber to post to the list. | Subscriber Info (Addr. Change, sub, unsub etc.): | http://mailman.qth.net/mailman/listinfo/elecraft | | Help: http://mailman.qth.net/subscribers.htm | Elecraft web page: http://www.elecraft.com | | | | -- | No virus found in this incoming message. | Checked by AVG Free Edition. | Version: 7.1.375 / Virus Database: 267.15.0/249 - Release Date: 2/2/2006 | | _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
