I've always heard and seen good performance from Sinclair, except for
the SRL-222 and SRL-224. Those two were problematic.
Chuck
WB2EDV
Jeff DePolo WN3A wrote:
>>I would agree the Sinclair Antennas are well built and
>>very broadband, but I had a horible time with a number
>>of 4 bay vhf broadband units installed (and removed)
>>in 2005. We bought a large number of VHF SLR-235
>>units new. The part number has changed but the antenna
>>is the same current 4 dipole current model.
>>
>>The performance stank, with wild patterns and imd
>>generation from all the brand new antennas we bought
>>and installed at different locations. What a let down
>>vs the good performance of other Sinclair antennas we've
>>purchased in the past.
>>
>>
>
>Geez Skipp, that's pretty unusual. I've never had anything but good luck
>with Sinclair's dipole arrays, both on highband and UHF. I'm not a big fan
>of their whitesticks though. As I'm sure you know, most of their antennas
>are available in "low PIM" versions, though I've never had any IM problems
>with even their older, standard models.
>
>
>
>>I figured it might be something we did, so I had a number
>>of people check everything at least twice over. Yes
>>we checked the harness phasing, element spacing yadda,
>>yadda. But the same problem with 6 brand new antennas
>>at 3 different locations?
>>
>>
>
>The only thing that comes to mind is maybe a "quality control" issue at the
>factory that resulted in one or more of the dipoles being assembled
>upside-down resulting in severe cancellation. I know they usually mark one
>side of each element with a band of red tape to ensure they are properly
>phased, but somebody could have screwed this process up (or maybe they
>marked them after assembly instead of before). If you have nothing else to
>do (hi), maybe you could do some tests to ascertain whether or not this is
>the case, perhaps by transmitting a few hundred mW into the input and using
>a scope to look at the relative phase between elements (i.e. check to see
>that the upper side of the feedpoint is in-phase between each of the
>elements).
>
> --- Jeff
>
>
>
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