[TenTec] OT: Question to the group -tuner and dipoles

[Carl Moreschi]

It is my opinion that very low dipoles that are much less than 1/4 
wavelength are efficient radiators but most of the radiation is straight 
up.  So they are not good for long distance but work well at low HF 
frequencies for short distances where straight up is fine since it 
refracted right back down in the ionosphere.

Does anyone have any real data to either support this or refute it?

Carl Moreschi N4PY
58 Hogwood Rd
Louisburg, NC 27549
www.n4py.com

On 7/18/2016 6:15 PM, Darrell Bellerive wrote:
> How do you know this? Did you make comparisons with dipoles at greater
> heights? Low power enthusiasts (QRP'ers and QRPp'ers) make lots of
> contacts with very little power, so just because you made contacts
> doesn't mean your antenna was efficient and not affected by ground losses.
>
> 100 watts into an antenna system with 13 dB loss is 5 watts effective
> radiated power (ERP).
>
> 100 watts into an antenna system with 20 dB loss is 1 watt ERP.
>
> Either case will still make lots of contacts. Any antenna is better than
> no antenna. Just don't think that a very low antenna height is helping
> your transmit signal. You are succeeding in spite of it.
>
> 73, Darrell VE7IU
>
>
>
> On 16-07-18 03:02 PM, Stuart Rohre wrote:
>> Surprisingly, we found the ground losses to NOT affect adversely our
>> use of 100 watt transmitters at Field Days for NVIS to our target
>> areas in state of TX and nearby states.
>
>