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Author Topic: 120 ac 12 dc 10 amp converter needed  (Read 8029 times)

FLAUXCOMBOB

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120 ac 12 dc 10 amp converter needed
« Reply #15 on: June 07, 2007, 12:47:27 PM »

Looking st the Polyphaser web site I see there are a number of surge protectors...lol

What type would I need, DC Pass or DC blocked proction surge protector.  The DC Blocked type seems to be for higher ranges than I would be on (2-3MHz)VHF.

Looking at the protectors on this page....which ones would be appropriate for me?

 http://www.polyphaser.com/productdata.aspx?class=coax

Thanks,

bob
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FLAUXCOMBOB

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120 ac 12 dc 10 amp converter needed
« Reply #16 on: June 07, 2007, 01:22:45 PM »

Just talked to an engineer at Polyphaser and he gave me the speal on which one i should have and is setting me up to get a freeby (sample) for my use...lol

Bob
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AA4PB

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120 ac 12 dc 10 amp converter needed
« Reply #17 on: June 07, 2007, 03:55:29 PM »

Often a female to female connector is mounted on a grounded metal plate. The coax run is split and run thru this connector. That grounds the shield of the coax. The surge protector will do the same thing plus protecting the inner conductor from surges.

Your radio is a VHF marine. That's 156mHz to 157mHz, not 2-3mHz. There are HF marine frequencies in the 2-3mHz range but the radio you listed doesn't cover them.

Great that Polyphaser is sending you a sample :-)
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Bob  AA4PB
Garrisonville, VA

FLAUXCOMBOB

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120 ac 12 dc 10 amp converter needed
« Reply #18 on: June 07, 2007, 08:05:02 PM »

Thanks AA4PB,

I had a talk with the engineering dept. at Polyphaser and he said I can attach it to the tower as long as I am grounding the tower with good grounds.

I'm getting a little flack in Tower Talk, about putting up a rohn-25 tower section up against my house from the top of the carport to the second story roofline (1 section).  Oh well.  I'm going to make a slip tube (weld it on) on top of the tower section and be able to slip in a 25' extendable (portable) tower so as to be able to use the portable tower at home also.  We have to use it for SAR (Search and Rescue) operations along the intercoastal where we can't get radio communications.
What do you think?  It gives me 65' at the antenna base. 15' elevation + 15' carport + 10'rohn-25 + 15' of the portable tower.  Puts me over the treetops by 5 feet.

Bob

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NA0AA

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120 ac 12 dc 10 amp converter needed
« Reply #19 on: June 07, 2007, 11:47:00 PM »

AES lists the following in their summer catalog:

Regulated supplies:

RS-12A - $79.88
RS-35 [25 amps rated continuous] - $149.99

Switching supplies:

SS-25 [20 contin, 25 ics] $119.99
SS-30 - $129.99

Their phone number is 800-558-0411.  I do not work for them but have bought from them in the past.  They have been OK in my limited experience.

Due to ripple in the DC output, you cannot use the switching supplies as a battery standby charger, but the RS supplies can be readily connected in this application to good effect.  An RS-12 connected with a 55 amp hour deep cycle battery to the radio you descirbe will give you transmit amps for the marine radio and automatic backup power.  If you later add a 100 watt HF rig, the battery can supply the additional amps needed during SSB voice peaks.  The power supply will provide receive current demands and low power transmitter demands without draining the battery at all.

I do this at my shack with an RS-7 supply connected to two batteries and run 3 radios on receive w/out tapping the battery capacity at all.  The power supply puts a few mills into the batteries 24 hours a day even with the radios switched off, keeping them topped off.  I can use the VHF/UHF all day and if I need to do extensive HF work, the battery takes up the slack.  Durned handy and more economical than leaving my RS-50 on 24/7 [the RS-7 draws 5 watts on standby, the RS-50 draws 30 watts!] to float the battery bank.
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AA4PB

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120 ac 12 dc 10 amp converter needed
« Reply #20 on: June 08, 2007, 05:46:19 PM »

Height is good. Just be careful that the carport can support the weight of the tower and antenna. Also remember that the Rohn 25 is galvanized and anywhere you weld it will be subject to rust if its not protected.
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Bob  AA4PB
Garrisonville, VA

FLAUXCOMBOB

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120 ac 12 dc 10 amp converter needed
« Reply #21 on: June 10, 2007, 10:23:18 AM »

Thanks AA4PB!

I desided to do an inground as I described in my TowerTalk forum.  Don't want to tak any chances on having damage done to my house in wind and lightning conditions.

FLBOB
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