Pat,

Having sat through a number of arguments on this subject, I recall one such adventure.  A friend of mine,  a very well respected and long term ham who lives under an aluminum cloud listened and listened and finally spoke up.  "Good insurance!"  Do what you can afford but nothing will protect you completely.  I always feed my preamp for 70cm over the coax so the point about no DC block is important.  Before putting up a 2m preamp you might want to check local ambient noise.  If high it might not buy you much on receive and is just one more thing to worry about.

John K7SYS 

On Thu, Oct 20, 2022, 08:23 Pat Kilroy <patkilroy1@gmail.com> wrote:
Hi Rich, 

Wow, your antenna arrangement sounds great!  

I bet most of the guys and gals here will recommend to consider each antenna and preamp pair as a single unit in this particular case!  … 

That is, the preamps are as close to the antennas as practical, and your arrester/polyphasors mounted near the grounding connection through a nice tin-coated copper braid and connects the RF to your feedline to the shack.  Except that you must make sure your arrester does not block any DC needed by your preamps.  In which case you may need to power the preamps *not* through the cables.  

Food for thought.  Or to let the technical arguments fly!  

Cheers,

Pat N8PK-FM19
Maryland USA

https://www.dxengineering.com/search/department/grounding-and-lightning-protection



On Thu, Oct 20, 2022 at 10:19 AM Rich Gopstein <rich@ourowndomain.com> wrote:
I'm installing a pair of M2 circularly polarized yagis.  I have a long coax run, so I'm going to use SSB Electronics preamps mounted on the 8' tower.

I have a ground rod by the base of the tower with a couple of lightning arrestors that the two coax runs go through, but I was curious what to do about protecting the inputs to the preamps?  Do I use a second pair of lightning arrestors between the antennas and the preamps? Or just mount the preamps on the shack-side of the existing lightning arrestors?

Rich, KD2CQ

-----------------------------------------
--
 
 
Pat Kilroy 1
 
 
 

-----------------------------------------------------------

Sent via AMSAT-BB(a)amsat.org. AMSAT-NA makes this open forum available
to all interested persons worldwide without requiring membership. Opinions expressed
are solely those of the author, and do not reflect the official views of AMSAT-NA.
Acceptable Use and Privacy Policies available at https://www.amsat.org/about-amsat/

View archives of this mailing list at
https://mailman.amsat.org/hyperkitty/list/amsat-bb@amsat.org
To unsubscribe send an email to amsat-bb-leave(a)amsat.org
Manage all of your AMSAT-NA mailing list preferences at https://mailman.amsat.org