[K3CAL] replacement antennas for Prince Frederick
Shawn Donley
n3ae at comcast.net
Fri Oct 5 16:11:40 EDT 2018
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 mailto: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 mailto: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 [mailto: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 mailto: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
> > > >
> > > >
> > > >
> > > > > > >
> > >
> > >
> > >
> > > > > > > ______________________________________________________________
> > > > K3CAL mailing list
> > > > Home: http://mailman.qth.net/mailman/listinfo/k3cal
> > > > Help: http://mailman.qth.net/mmfaq.htm
> > > > Post: mailto:K3CAL at mailman.qth.net
> > > > Unsubscribe: mailto:k3cal-request at mailman.qth.net?subject=unsubscribe
> > > >
> > > > This list hosted by: http://www.qsl.net/
> > > > Please help support this email list: http://www.qsl.net/donate.html
> > > >
> > > > > > >
> > >
> > >
> > >
> > > ______________________________________________________________
> > > K3CAL mailing list
> > > Home: http://mailman.qth.net/mailman/listinfo/k3cal
> > > Help: http://mailman.qth.net/mmfaq.htm
> > > Post: mailto:K3CAL at mailman.qth.net
> > > Unsubscribe: mailto:k3cal-request at mailman.qth.net?subject=unsubscribe
> > >
> > > This list hosted by: http://www.qsl.net/
> > > Please help support this email list: http://www.qsl.net/donate.html
> > >
> > > > >
> >
> > >
> > > ______________________________________________________________
> > K3CAL mailing list
> > Home: http://mailman.qth.net/mailman/listinfo/k3cal
> > Help: http://mailman.qth.net/mmfaq.htm
> > Post: mailto:K3CAL at mailman.qth.net
> > Unsubscribe: mailto:k3cal-request at mailman.qth.net?subject=unsubscribe
> >
> > This list hosted by: http://www.qsl.net
> > Please help support this email list: http://www.qsl.net/donate.html
> >
> > >
> ______________________________________________________________
> K3CAL mailing list
> Home: http://mailman.qth.net/mailman/listinfo/k3cal
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:K3CAL at mailman.qth.net
> Unsubscribe: mailto:k3cal-request at mailman.qth.net?subject=unsubscribe
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/k3cal/attachments/20181005/95b06c38/attachment-0001.html>
More information about the K3CAL
mailing list