From owner-qrp-l@Lehigh.EDU Thu Feb 13 16:05:16 1997 Received: from fidoii.CC.Lehigh.EDU (fidoii.CC.Lehigh.EDU [128.180.1.4]) by oucsace.cs.ohiou.edu (8.7.6/8.7.1) with ESMTP id QAA29114 for ; Thu, 13 Feb 1997 16:05:15 -0500 (EST) X-Received-x: from fidoii.CC.Lehigh.EDU (fidoii.CC.Lehigh.EDU [128.180.1.4]) by oucsace.cs.ohiou.edu (8.7.6/8.7.1) with ESMTP id QAA29114 for ; Thu, 13 Feb 1997 16:05:15 -0500 (EST) Received: from Lehigh.EDU ([127.0.0.1]) by fidoii.cc.lehigh.edu with SMTP id <35630-38981>; Thu, 13 Feb 1997 16:04:47 -0500 Received: from nss2.CC.Lehigh.EDU ([128.180.1.26]) by fidoii.cc.lehigh.edu with ESMTP id <35511-36422>; Thu, 13 Feb 1997 16:02:46 -0500 Received: from mh004.infi.net ([208.131.167.6]) by nss2.CC.Lehigh.EDU (8.8.5/8.8.5) with ESMTP id QAA88768 for ; Thu, 13 Feb 1997 16:02:36 -0500 Received: from pa5dsp8.nr.infi.net by mh004.infi.net with SMTP (Infinet-S-3.3) id QAA06968; Thu, 13 Feb 1997 16:01:21 -0500 (EST) Message-Id: <199702132101.QAA06968@mh004.infi.net> Date: Thu, 13 Feb 1997 16:01:21 -0500 (EST) Reply-To: ae4ic@nr.infi.net Sender: owner-qrp-l@Lehigh.EDU Precedence: bulk From: Bob Kellogg To: "Low Power Amateur Radio Discussion" Subject: Tuner Test III Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" X-Sender: ae4ic@nr.infi.net X-Mailer: Windows Eudora Light Version 1.5.2 X-Listprocessor-Version: 8.0 -- ListProcessor(tm) by CREN Status: O Gang, I've completed tests on the Murch UT 2000A, and the data is added to the list for comparison purposes. After the data, there is a short description of each tuner tested, in case some of you are not familiar with the model nos. It is important to remember that the information below is a summary, and cannot indicate performance on any individual SWR/Frequency combination. Some perform better on certain frequencies than others. These results are based on testing one or two tuners which may or may not be representative of all of the tuners of the same model. (particularly true of kits which may have variations in wire routing) The tuners were tested for five conditions: RANGE - The number of SWR/Frequency combinations, within the advertized frequency range of the tuner, that could actually be tuned to 1.1:1 SWR or better. Results: MFJ-949E 137/162 (137 out of 162 possible) ZM-1 140/144 St. Louis 138/144 Murch 2000A 71/72 EFFICIENCY - The number of SWR/Frequency combinations, within the advertized frequency range of the tuner, which resulted in less than 20% (approx. 1 db) power loss. Results: MFJ-949E 49/162 ZM-1 60/144 St. Louis 1/144 (not an error) Murch 2000A 35/72 AVERAGE LOSS PERCENTAGE - The average signal loss of all of the SWR/Frequency combinations which would match to 1.1:1 or better. Results: MFJ-949E 29% ZM-1 22% St. Louis 43% Murch 2000A 22% SWR BANDWIDTH - The number of SWR/Frequency combinations, within the advertized frequency range of the tuner, which enabled a tuning range greater than 5% of the primary frequency. (5% on 7.2MHz is 360Kc) (Once the tuner is set, how far can we tune from the frequency before SWR climbs to 1.5?) Results: MFJ-949E 73/162 ZM-1 61/144 St.Louis 77/144 Murch 2000A 22/72 BALANCE - The number of SWR/Frequency combinations, within the advertized frequency range of the tuner, indicating a balanced output with less than 1.5:1 difference between the lines. Results: MFJ-949E 52/81 ZM-1 72/72 St. Louis 72/72 Murch 2000A N/A (Murch is an unbalanced only tuner) TUNER DESCRIPTIONS: MFJ-949E: A C-L-C "T" design. Uses a tapped air inductor. Rated at 300 watts. Balun provides balanced output. Tunes 160M through 10M. Case about 3-1/2" X 10-1/2" X 7-1/4" ZM-1: A "Z-match" design. Uses a ferrite core inductor. Rated at 15 watts maximum. Link coupled for balanced output. Tunes 80M through 10M. Case about 2-1/2" X 5" X 1-1/2". St. Louis: A C-L-C design. Uses a tapped ferrite core inductor. Rating unknown, probably 25 watts or more. Balun provides balanced output. Tunes 80M through 10M. Case about 2-3/4" X 6-1/4" X 5". Murch UT 2000A: An "Ultimate Transmatch" design popular in the 1980's and found in the 80's Handbooks. (This one did not have the "SPC" mod) Rating 2000 watts. Unbalanced output only. Tunes 80M through 10M. Case about 5-1/2" X 12" X 12". Have received an LDG QRP automatic tuner, and it will be tested next. CUL, Bob Kellogg, AE4IC, Greensboro, NC Prolably, but not nececelery. - Benny Hill