[K3CAL] replacement antennas for Prince Frederick

Fri Oct 5 16:17:48 EDT 2018

since i'm not an antenna expert, i will divert to others for the decision.
my only concern is i have been screwed getting a few things off of ebay
once or twice on used stuff.  if it is new being sold by a shop, then no
problem.

dick t
ae3dt

On Fri, Oct 5, 2018 at 4:11 PM Shawn Donley <n3ae at comcast.net> wrote:

> My recollection trying to come up with antenna choices for the County
> RACES infrastructure project is that as soon as you ask for a dual band
> 2M/70cm antenna, there just are not any "commercial grade" choices out
> there.  I'd be very interested if anyone knows an exception.
>
>
> Moving to commercial grade means a one-band antenna.  Take a look at the
> Telewave link below.   Big prices.  Over $1000 for an antenna roughly
> electrically equivalent to a Diamond X50 ( < $100 ) but presumably more
> robust mechanically.
>
>
> https://www.telewave.com/products/base-station-antennas/
>
>
> Shawn
>
> On October 5, 2018 at 2:22 PM James Tetlow <k3uga at comcast.net> wrote:
>
> No that it matters, but I agree with Chuck’s choice for medium gain
> antennas. For non commercial they are very high wind rated. May want to
> consider Shawns recommendation of 6 foot stand-offs for both antennas, and
> add a top standoff stabilizer bracket for the X300NA.
> Guess we will never get the HAM out of buying commercial antennas, just
> remember the antenna on a commercial tower is the weakest link in the
> repair chain (like were we are now).
>
> Sent from my iPad,
> Best Regards,
> Jim Tetlow
>
> On Oct 5, 2018, at 1:59 PM, Chuck Shefflette via K3CAL <
> k3cal at mailman.qth.net> wrote:
>
> Dave,
>
> I hope this isn’t a duplicate, it looks like the first one I sent, didn’t
> go anywhere. I’ll throw my $0.02 in here, we should go with the Diamond,
> purchased from a dealer such as HRO, not from eBay.
>
> For the repeater, I would go with the X300NA, for the links the X50NA. The
> X300NA is rated for up to 112 mph winds, the X50NA for up to 135 mph winds.
> Short of a major hurricane, they should both work well even though they
> aren’t really intended for use on a commercial tower. They also both have
> “N” connectors (the NA int the part number), which are preferred over UHF
> connectors.
>
> The X300NA is listed at $139.95 at HRO. The X50NA is listed at $94.95 at
> HRO but is on sale at the moment for $89.95.
>
> Chuck - AA3CS
> *------*
> *“Insanity is doing the same thing over and over again and expecting
> different results.” -- Albert Einstein*
>
> On 05 Oct 2018, at 13:13, David Weaver < W3PQS at comcast.net> wrote:
>
> Thanks for all the input. I appreciated.
> Looks like to me the Tram antenna should not be used in either works or it
> doesn't. I know we have a local, ham that point up. He just notified me
> that it's not working. It needs to be replaced.
> However, the diamond antenna has a little bit better reputation.
> I need for Cara members to take a look and find an antenna they would like
> to install it. It's up to the executive board. I will put up. Whatever you
> say. Please don't take too long. Let's keep this project moving
> Dave W3PQS
>
>
> *From:*  k3cal-bounces at mailman.qth.net [
> mailto:k3cal-bounces at mailman.qth.net <k3cal-bounces at mailman.qth.net>] *On
> Behalf Of *Shawn Donley
> *Sent:* Friday, October 5, 2018 11:55 AM
> *To:* Calvert Amateur Radio Association - K3CAL
> *Subject:* Re: [K3CAL] replacement antennas for Prince Frederick
>
>
> Dave,
>
>
>
> Take a look at https://www.eham.net/reviews/detail/4203
>
> The 1481 seems to either work well or sucks badly.  No idea why the spread
> of experiences.
>
>
>
> Perhaps a Diamond X300NA instead?
>
>
>
> In any case, longer 6-foot standoff's might help.
>
>
>
> Shawn
>
>
>
>
>
> On October 5, 2018 at 11:26 AM David Weaver <W3PQS at comcast.net> wrote:
>
> *Hello, Cara members *
>
> *At last night meeting, you asked me what type of antenna we should use. I
> found these 2 on eBay. *
>
> *One is 17 foot long and the other is 5.6 Feet *
>
>
>
> *Tram 1481 Dual Band 2M/70cm 144-148 & 440-450 MHz Base/Repeater Antenna
> 17'*
>
>    - 11.7dbd gain UHF430 MHz - 450 MHz
>    - 8.3dbd gain VHF 144MHz -148MHz
>
>
>
> *Diamond X50A VHF/UHF Dual Band 2Meter/440 Amateur Ham Radio Base Antenna *
>
>
>
> Band:
>
> 2m/70cm
>
> Gain (dB):
>
> 4.5/7.2
>
> *Please let me know what you think? *
>
> *Also, there's a lot of coordination that needs take place to replace the
> antennas. *
>
> *If you would like for me to move forward with the coordination of cable
> and antennas. Please let me know *
>
> *We will need to get an estimate from a company to climb the tower and
> install the antennas. *
>
> *David Weaver W3PQS *
>
>
>
>
>
>
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