Bird did make a 10 Watt slug a few years ago, but there must not have been many of them and the on line Bird seller had one at a very high price. Like two times the regular price. It sold immediately as I remember. I used a couple Birds attached with an N union and had a 25 in the rev and a 1K in the fwd with peak detector. It was a good setup. I generally don't even need a wattmeter, but set one up mostly as a project more than any other reason..
Chuck Hawley [email protected] Amateur Radio, KE9UW aka Jack, BMW Motorcycles ________________________________________ From: [email protected] [[email protected]] on behalf of Joe Subich, W4TV [[email protected]] Sent: Monday, March 19, 2018 8:29 PM To: [email protected] Subject: Re: [Elecraft] DMM recommendations > When taking reflected power readings the slug should be 1/10 of the > forward slug value when testing a reasonably good antenna. So, a 100 > watt forward slug would require a 10 watt reverse slug for reasonable > accuracy. Unfortunately, the smallest HF slug Bird make is 25 Watts. That means any SWR less than 1.4:1 (2.8% reflected power) is suspect with a 100 W transmitter. It is a shame that Bird do not offer a 10 (or 5 W HF element) and the one reason I moved to the LP-100(A) several years ago. However, I would never think to take the LP-100(A) or microHAM SMΩRF out into the field. 73, ... Joe, W4TV On 3/19/2018 8:10 PM, JOE wrote: > I spoke to someone at Bird (when they were really Bird) years ago and I > was told that the Bird wattmeter is accurate to ±5% of top scale. This > means that a 100 watt slug can be off ±5 watts _anywhere_ on the meter. > So, a transmitter emitting 50 watts out, using the Bird and a 100 watt > slug, can read between 45 and 55 watts. That's why he said it was > important to keep the reading in the top 1/3 (highest) end of the > meter. This is where the error is less. When taking reflected power > readings the slug should be 1/10 of the forward slug value when testing > a reasonably good antenna. So, a 100 watt forward slug would require a > 10 watt reverse slug for reasonable accuracy. > > I retired my Bird 43 and the vast assortment of slugs for a Telewave > Model 44A wattmeter and never looked back. The drawback to the 44A is > it is limited to 20-1000MHz. The Bird would be good for HF use. > > 73, Joe, K1ike > > Date: Mon, 19 Mar 2018 18:40:41 +0000 >> Always bear in mind that their odd meters (30 uA) are very non-linear and >> measurements made using element ranges that fall in the bottom 1/3 or >> so of >> the scale are the most accurate. Overall, they claim to be accurate >> to +/- >> 20 percent of full scale. HORRIBLE in >> today's world! >> >> FWIW ... >> >> 73! >> >> K0PP > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [email protected] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
