Multiband HF-6m antenna, compromise,

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Multiband HF-6m antenna, compromise,

Postby Weirdglezga » Sun Jan 08, 2017 10:16 pm

Il have my yaesu ft-450d, this week, but I have only a nomad antenna, which I've noticed receives from 25 - 1500mhz.

The yaesu is HF and 6m, rig, I'm in a condo, middle flat, and have my nomad in the loft, 10m rg58 feeding it

I also have a moonraker whizz whip and an mfj1022, indoor active antenna, will any of these be suitable for receiving All bands bands.

Was wondering if I could get better reception from fitting a new antenna in the loft and feeding it will either rg213, or 450ohm ladder line,,maybe a G5RV, or ZS6BKW, or a sotabeams 4 band antenna,

Looking for best suggestion,,,I'm sure my loft is about 40m, 50m wide, but the flats are a triangle shape, so if I was fitting a feed in middle of loft I'd need 20m of Coax or twin feed and the legs wouldn't be straight

Many thanx

I've done a small illustration of flats shape from the air, but don't know how to add it to post,,,,maybe I can pm it
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Re: Multiband HF-6m antenna, compromise,

Postby Weirdglezga » Sun Jan 08, 2017 10:24 pm

http://s1156.photobucket.com/user/marsh ... rary/Yaesu

Don't know if that will work,,,it's a drawing looking from the air onto the roof of flats

A rough drawing
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Re: Multiband HF-6m antenna, compromise,

Postby m0lsx » Sun Jan 08, 2017 10:27 pm

I don't know the Wizz Whip or the MFJ 1022 personally, but the 1022 should work as a good RX antenna & google suggests the Wizz Whip is a Miracle Whip. so yes that should make a great RX antenna.
I have a Miracle Whip & it makes a much better RX antenna than it does a TX antenna & it's not at all bad as a very small TX antenna.
I use an M0CVO off centre fed dipole zig zagged around my loft as a back up antenna & it does a reasonable job.

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Re: Multiband HF-6m antenna, compromise,

Postby Weirdglezga » Sun Jan 08, 2017 10:37 pm

Thanx Alan, il try both when I receive radio Wednesday,,,can I run said radio from a battery, maybe a car battery and just charge at night,,think the radio needs 22 amps.

When we go away in caravan, the electricity on site will boil a kettle as long as nothing else is on, so I don't know if said electricity would rum a 30 amp power supply like this one,,,MyDEL PS-LM30 PSU (Similar to MP-304.

That's why I'm thinking battery

Thanx
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Re: Multiband HF-6m antenna, compromise,

Postby Chris P » Mon Jan 09, 2017 9:23 am

12v at30A = 360 watts
12vDC @ 22A =264Watts
Caravan mains power feeds are usually 2200W ie 220V @ 10A
kettle uses 1500 W so plenty of available power for your Radio PSU even if its not efficient

in theory both at same time unless your kettle is a 2KW model
Regards Chris aka G8FFF nipper or tazmin88
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Re: Multiband HF-6m antenna, compromise,

Postby Weirdglezga » Tue Jan 10, 2017 1:34 am

Thanks Alan and Chris,,,I should have been able to work that out but I'm struggling with ohms law just now,,,keep getting it,,then it's gone again
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Re: Multiband HF-6m antenna, compromise,

Postby m0lsx » Tue Jan 10, 2017 11:37 am

Think of that triangle as being like a Christmas tree & then remember that a Christmas Tree is a Fir tree. Then it's Simple as it is a Vir Tree.
V =Volts. I = Current or Amps & R = Resistance or Ohms.
V is above I & R, thus must be divided by them, Amps & ohms are beside, so must me Multiplied.

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Re: Multiband HF-6m antenna, compromise,

Postby Weirdglezga » Thu Jan 12, 2017 12:11 am

Thanx Alan

il need to get a calculater a think :smiles:
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Re: Multiband HF-6m antenna, compromise,

Postby m0lsx » Thu Jan 12, 2017 9:27 am

Most PC's, phones, tablets etc have calculators built in.
Also, as a cautionary note. Unless you know what you are working out take care. As for example if it things like how many amps do I need to feed my radio, then they have that information in the manuals & if working it out for yourself don't forget to take into account the efficiency of the transmitter. As if you just use X amps at X volts gives me X watts, then you will be under estimating the amps significantly.
Knowing ohms law is certainly essential if you want to for example take the amateur exam or work with electronics. But knowing Ohms Law is the simple part.
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