Does anyone know how to calculate the dB loss equivalents for given SWR values? Either a on-line chart of the equivalent loss for all SWR values or a formula where I could plug in various values and
There are two tables in the Handbook that will do the trick for you. One tells you the attenuation for a particular type of coax and the other tells you the additional loss due to SWR. They are in th
Nat asked: Nat what you are looking for has just been "re-published". In Chapter 6, page 6-6, you will find a full page nomegraph which gives all the variables applicable vs. the resistive attenuatio
Nat, Do you not have an ARRL Handbook for Radio Amateurs? Do you not have an ARRL Antenna Handbook? Both have sections dealing with transmission line losses in matched and mismatched lines. Also, if
Whoa. Thanks for all of the fast responses. The most popular suggestion appeared to be looking in the ARRL Handbook. I checked out the handbook and with some consideration I figured out the following
Nat, et. al.: Last year I gave a talk on this topic and created some graphs that are not in the ARRL material but are derived from the formulas in that material. The graphs show additional loss in dB
Pardon the lecture that follows, but I think you have been misled. This really is worth getting into! A 3:1 SWR does NOT cause a 25% power loss. It might cause an increase in loss, but that increase
Woops, let me correct this: That should be "have HIGH loss"...not "be lossless". The rest was OK. 73, Tom W8JI W8JI@contesting.com List Sponsor: Are you thinking about installing a tower this summer?
The formula you found is correct in the sense that because of a 1:3 SWR the power delivered to a non reactive load by an ideal 50 Ohm generator is 1.25 dB less than it would with a 1:1 SWR. If the ac