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Author Topic: Rockmite 20  (Read 3787 times)
GM3HNN
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Posts: 1




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« on: May 15, 2014, 10:15:23 PM »

Hi Everyone,

I have just purchased a ready built Rockmite 20, ( my eyes aint that good anymore), I have also purchased a base loaded telescopic antenna, for 20m to fit on the right angle BNC, do you think the SWR will be ok ? what do you think,? would I be better with a tuner and a wire antenna ?

sorry for butting in on this forum, but I think you guys would be the best to ask!

thanks

Tommy
GM3HNN
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AF6WL
Member

Posts: 146




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« Reply #1 on: May 16, 2014, 06:45:15 AM »

0.5W into a short telescoping antenna with no ground system sounds challenging / frustrating depending on you point of view.
An end-fed halfwave wire with matching unit would a simple but effective solution : google - 20m efhw
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K7KBN
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Posts: 2825




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« Reply #2 on: May 16, 2014, 07:17:56 AM »

Easiest way to find out if it will "work", or "be ok" is simply to try it.  So try it.
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73
Pat K7KBN
CWO4 USNR Ret.
K8AXW
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Posts: 3958




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« Reply #3 on: May 16, 2014, 05:46:58 PM »

With an antenna hanging on the right-angle BNC connector, how would you check the SWR.  Or why you would even consider using this arrangement.

As far as performance is concerned, I think you'll be lucky to get out of the back yard!  Sure, anything is possible, like the guy who used a set of bed springs for an antenna. 

If you're seriously considering using your Rockmite for making contacts, get the antenna outside and be sure it's tuned to your radio.  At those power levels, anything lost can mean the difference between success and failure.
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OK1RP
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Posts: 81




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« Reply #4 on: July 31, 2014, 04:11:21 AM »

Tommy,

I am using the HF handheld MX-21S for 15m band from Mizuho when backpacking and I made several QSOs even DX on CW with just telescopic antenna only... but be careful!

The efficiency of these antennas is really low. Counterpoises are always needed (just 1-2pcs of 1/4wl at the operating place) or if You have radio in hands then You HAVE TO HAVE the metal chasis placed on Your belly to use Your body thru capacity as counterpoise. Always select the high altitude levels QTH (hills etc.) In general do not expect so much enjoyment with this config.

I can highly recommend if you will operate at portable QTH or at home using any kind of dipoles like inverted V or even simple vertical + radials cutted to the band (no ATU > additional losses).
I used years ago for fun the RM40 into the Inverted V dipole at home and I worked 35DXCC including the USA and ZL!

Just to note that if You will use big antennas then You will need maybe additional BPF to prevent BC station breakthru.

Good luck,

73 - Petr, OK1RP

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