Topband: How good is good enough

[Pete Smith N4ZR]

Just cut 20 more 70' radials.  Time to go play in the yard.

73, Pete N4ZR
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On 11/12/2022 11:41 AM, Grant Saviers wrote:
> The 34 ohms is the sum of Rr (antenna radiation Z over perfect ground) 
> and Rg (ground R loss).  Rr depends on the dimensions of the L plus a 
> bit of wire loss.  My guess is Rr is about 10 ohms less than 34 ohms, 
> some easy modeling will determine it.
>
> Then it is a question of what antenna efficiency you want vs cost and 
> time for more radials.  If 10 ohms is Rg, then about 1/3 of the TX 
> power is warming the worms.
>
> Grant KZ1W
>
> On 11/12/2022 07:31, ws6x.ars at gmail.com wrote:
>> In my experience here in "ROCK"ingham County, I didn't reach the 
>> point of diminishing returns until around 32 radials of varying 
>> lengths (Most were either 50 or 100' long.). Much would depend on 
>> length, configuration, terrain and ground conductivity.
>> Jim - WS6X
>>
>> -----Original Message-----
>> From: Topband <topband-bounces+ws6x.ars=gmail.com at contesting.com> On 
>> Behalf Of Pete Smith N4ZR
>> Sent: Monday, November 7, 2022 4:27 PM
>> To: topband reflector <Topband at contesting.com>
>> Subject: Topband: How good is good enough
>>
>> Now that the lawn mowing is done for the season, I resuscitated my 
>> 160M inverted L.  With 13 on the ground radials, each roughly 70 feet 
>> long, measured R of 34 ohms seems OK to me.  Is it worth laying down 
>> more radials, or am I approaching diminishing returns?
>> -- 
>> 73, Pete N4ZR
>>
>>
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