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Well VK as I noted, my model is not perfect either. I did not consider tapper and as you'll note there is no boom on the Sirio. However, in other yagi models I've compared, I've noted that the boom does have some effect, but again...the difference is very small with a horizontal setup in particular.

I also agree that some things related to matching could be used to effect the bandwidth maybe, so if Robb's bandwidth is very wide compared to the specs that Sirio published...then maybe that might help us explain the dichotomy that Robb has reported in this regard.

Sirio shows us a very narrow bandwidth, probably at the feed point, for the SY27-4, <>600khz, and that is why I asked Robb about his actual <2.00:1, bandwidth.

[QUOTE="Marconi, post: 433233, member: 903"] Well VK as I noted, my model is not perfect either. I did not consider tapper and as you'll note there is no boom on the Sirio. However, in other yagi models I've compared, I've noted that the boom does have some effect, but again...the difference is very small with a horizontal setup in particular. I also agree that some things related to matching could be used to effect the bandwidth maybe, so if Robb's bandwidth is very wide compared to the specs that Sirio published...then maybe that might help us explain the dichotomy that Robb has reported in this regard. Sirio shows us a very narrow bandwidth, probably at the feed point, for the SY27-4, <>600khz, and that is why I asked Robb about his actual <2.00:1, bandwidth. [/QUOTE]

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