[TowerTalk] Looking for poles, a remote switch, etc.

[Michael Goins]

There's a quad in the not-too-distance future here - might be a few
months because of the remodelling going on right now, but looking for
parts. Need quad spreaders and a remote switch. Have Cubex spiders and
a set homebuilt from long ago that are aluminum but that hold the
poles at an angle like the Gem quad.

Anyone have poles or a source of good poles (beside Cubex)? Ever use
Calcutta poles? Antenna switch lying around?

Michael Goins, k5wmg
Professor, Writing
University of Texas at San Antonio
Please do not print this e-mail unless it is completely necessary




On Wed, Jan 28, 2009 at 4:55 PM, Jim Lux <jimlux at earthlink.net> wrote:
>
>
> -----Original Message-----
>>From: Kipton Moravec <kip at kdream.com>
>>Sent: Jan 28, 2009 2:29 PM
>>
>>I can answer the diode question.
>>
>>It is generally good practice to put a diode across the relay because of
>>the inductive spike when turning it off. I have seen the spike go 3-4X
>>the input voltage. If you may have a very long line to the relay the
>>spike may be more.
>>
>
> Actually, the relay manufacturers (e.g. Tyco, P&B, etc.) recommend NOT using the diode across the coil, because it reduces relay life and changes actuation speed.  Depending on whether you're suppressing across the coil or load, the approaches are different.
>
> http://relays.tycoelectronics.com/appnotes/app_pdfs/13c3311.pdf
>
> as they say:
> "Many engineers use a rectifier diode alone to provide the transient suppression for relay coils. While this is cost effective and fully eliminates the transient voltage, its impact on relay performance can be devastating."
>
> Jim, W6RMK
>
>
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