[HCARC] Field Day Antennas
Harvey N. Vordenbaum
tower2 at stx.rr.com
Fri Jun 6 20:59:38 EDT 2014
****You have to realize we are severely compromised on space to put up
antennas at the RC. What we have is what was thought could support the RC
and not to put in a rival to a full sized home station.
Members can come in operate HF with the antennas we have now, although not
real good on 80M.
********
-----Original Message-----
From: HCARC [mailto:hcarc-bounces at mailman.qth.net] On Behalf Of Gary J -
N5BAA
Sent: Friday, June 06, 2014 5:52 PM
To: Kerry Sandstrom; Bill Tynan; hcarc at mailman.qth.net
Subject: Re: [HCARC] Field Day Antennas
"Rather than trying to set up a bunch of temporary antennas, i think the
club would be better off trying to improve the club station capability"
BUT, Field Day is partially about being able to set up Temp Antennas as
needed, and unfortunately there is only one 20-10 meter antenna and one 40
meter L. With 2-3 radios running simultaneously that might be awfully
restrictive. I have no problem going up and picking up the club trailer to
use as one support for additional 40-10 OCF dipoles (numerous club members
are making them after Dale's class) and/or any other antenna someone wants
to try out. I have no problem bringing enough coax if necessary to run them
through a window or door if necessary.
My other question might be why we have so many UHF/VHF antennas on the roof
**********There are only two*****and virtually only the one 20-10 HF
Vertical. When was the last time someone talked on 70 cm, heck we hardly
use 2m and if I am not mistaken we have two of those on the roof. Not
saying we might not use both 2m antennas in an emergency, but why not more
HF.
**********There are two VHF/UHF antennas. One is a heavy duty J-pole combo
2M/.7M and one 2M. antenna. I would like to replace the J-pole with a gain
2M/.7M antenna in order to reach the 444.175 repeater in FBG.
There is another antenna for 47mHz for the RC.
HV******
I do agree we should ultimately improve the clubs station capability, along
with trying to increase the club use of said station. It's sad that we have
a growing number of Tech's who have no HF capability and who would benefit
from the encouragement gained by using the station radios on HF. I could
easily demonstrate this by merely counting the number of graduates of Dale's
classes who are active, both on the air and in the club. Unfortunately to
many/most club members the Radio Room is a BIG MYSTERY. It shouldn't be so.
*******I will be glad to have the station open and conduct some orientations
if some would like to come in and operate. Of course you have to work
around the RC's use of the room. There is a monthly calendar you can see on
their website, although it is a bit involved to get to. HV ******
I have been a member of the club for working on 3 years and I have had 2
chances to run the club station, both with the help and encouragement of
Gale Heise. Heck I have been secretary for working on 2 years and only have
had a key for 2-3 months.
Gary J
N5BAA
-----Original Message-----
From: Kerry Sandstrom
Sent: Friday, June 6, 2014 3:12 PM
To: Bill Tynan ; hcarc at mailman.qth.net
Subject: Re: [HCARC] Field Day Antennas
I agree with Bill, for Field Day, it seems disconnecting the 2 m and 432
antennas, if practical, might be the easiest solution. Harvey, how long are
the coax runs? M17/74, the current version of RG-8/U has a listed
attenuation of 1.5 dB /100 feet at 50 MHz and 4.8 dB at 400 MHz.
M17/29, the current version of RG-59/U which has the same nominal diameter
as RG-8X is not listed at 50 MHz but is 9.0 dB at 400MHz.
RG-8X is not a standard mil type cable. It should work without any problems
at HF, particularly if its a run of 50 feet or so and power is
100 W or so.
The nominal OD for RG-8X is just under 1/4 inch. It doesn't take much space
but would have to be pushed through with out connectors attached.
Rather than trying to set up a bunch of temporary antennas, i think the club
would be better off trying to improve the club station capability
Kerry
On 6/6/2014 2:24 PM, Bill Tynan wrote:
> Harvey et all:
>
> My recolection is that RG-8X is much more lossey than RG-8. For Field
> day, you won't need the 2 meter and 70 cm antennas, so why not
> disconnect them and use the cable for something - that is if they can be
gotten to easily.
>
> Could you, temporarily run coaxs through the window or the back door?
>
> Just a few thoughts.
>
> 73,
>
> Bill, W3XO
> On 6/6/2014 7:43 AM, Harvey N. Vordenbaum wrote:
>> Due to the limitations of the building feed through conduit we only
>> have a few coax's (RG-8's) available.
>> The HF antennas are combined outside by a remote coax switch box.
>> There is one spare feed through cable however.
>> There are separate coax's for the 2M and 2M/.7M antennas.
>> Fred has an idea of replacing all the present RG-8's with RG-8X cable
>> thus gaining a few more lines passing through. Someone could make a
>> calculation about how many lines would be gained. Making this change
>> would not be easy, however and time is getting short.
>> For field day we may have to pass coax through the partially opened
>> window, but then you wouldn't want a generator running nearby.
>>
>>
>> -----Original Message-----
>> From: HCARC [mailto:hcarc-bounces at mailman.qth.net] On Behalf Of Kerry
>> Sandstrom
>> Sent: Thursday, June 05, 2014 10:07 PM
>> To: Gary J - N5BAA; hcarc at mailman.qth.net
>> Subject: [HCARC] Field Day Antennas
>>
>> Gary,
>>
>> You may only need to put an antenna up for the GOTA station across
>> the street. Questions you need to answer are:
>> 1. Do the existing 40 and 80 m dipoles have separate
>> transmission lines?
>> 2. Can you operate one transceiver on the 20/15/10 Vertical
>> and another on the dipoles simultaneously?
>> 3. If the answer to 1 is yes, can you operate with one
>> transceiver on 80m and another on 40 m simultaneously?
>> 4. Is operation even permitted on 30/17/12 m for field day,
>> if not you don't need any WARC antennas?
>>
>> If you can operate on 80 and/or 40 simultaneously with 20/15/10, then
>> that is probably all you need. You won't be able to operate two
>> stations on any single band even with separate antennas behind the RC
>> Building. I suggest that if you really don't need to add any more
>> antennas you shouldn't.
>>
>> You should check out all the antennas and transmission lines that are
>> a permanent part of the station a couple weeks ahead of time in case
>> you need to make any repairs.
>>
>> If you are operating as 2 or 3F (why not 4F!!) then I don't think
>> setup time is even a factor since the station is ostensibly part of a
>> "permanent"
>> emergency fascility.
>>
>> Kerry
>>
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