[HCARC] Field Day Antennas

[Kerry Sandstrom]

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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