I have a few questions regarding the 500AT.
-When did production start and end?
-About how far away (miles wise) can it be heard?
-What all different port ratios did they have?
On the 550AT, there is one tone per side. One side has the high and the other has the low tone.Archon wrote:There is 2 versions of the 500 the 500T before 1960 and the 500AT after
500t has 8, 12, 9/12 the 500AT was 9/12 and 10/12. The 550AT 8/8 12/12 8/12 9/12?? 10/12?? on the 550 this is single tone each side was there dual tone each side??
According to Art Johannes and Dan Bierovic and Federal Signal, when I talked with them 18 years ago, they both said the Model 500 series came out in 1949, but became more popular in the 1950s. Likewise, there was a smaller version of the siren, but it lasted as long as the Model 550AT did, which was not very long.Thunderbolt 612 wrote:In the case of production, the 500AT & 550AT were made from the mid-1950's, and discontinued in the early 1980's.
As with coverage, they produced 120-125 dB, and covered around 1/2 to 3/4 miles.
Finally, the port ratios were 8 & 12 for single tone, and 8/12, 9/12, & 10/12.
I never knew that Federal made any 8/12 sirens. Does anyone know if Federal made any other sirens with 8/12 5th harmonies?Thunderbolt 612 wrote:In the case of production, the 500AT & 550AT were made from the mid-1950's, and discontinued in the early 1980's.
As with coverage, they produced 120-125 dB, and covered around 1/2 to 3/4 miles.
Finally, the port ratios were 8 & 12 for single tone, and 8/12, 9/12, & 10/12.
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