SDRplay Community Forum

ON5HB wrote:My money is mostly on the coax and some effect from the whip.

Bas,

After all this lengthy discussion you summarised it nicely. The coax is the antenna and the whip is acting as a counterpoise. No magic here!

My money is mostly on the coax and some effect from the whip.

Well.......to summarise there are three different theories on the carpet here about the unexpected but remarkable operation of the model D-130 Discone, without forgetting there is a 15 to 20 diB difference with the Beverage: 1) It is caused by the coaxial cable downlead acting as part of a capacitive ...

I am glad general consensus has been reached on this matter!

@glovisol The discone itself NEVER will receice any reasonable signal at low frequencies! It is much to small compared to the wavelength. JMG - I agree with you. The receiving element of this antenna is actually the outer shield ...

DISCONE ANTENNA ANALYSIS - IT'S NOT THE DISCONE, IT'S THE WHIP Discone antenna dimensions are approximately as follows: Top hat diameter D = 82 cm Antenna element length Ls = 120 cm Antenna height Lv = 105 cm Reverse engineering ...

I found this bit of information and they state: Additional vertical element on discone Often discones will be seen with an additional vertical element attached to the top of the antenna. This is often the case when they are used as a scanner antenna. This additional ...

The 20 m band really opened up today, to make me appreciate my new Discone antenna!

Hi JMG, could it be the trapped whip on top to work so well?

JMG it seems the discone is working well to me!

BUILDING A STABLE 1:1 LOW CAPACITANCE TRANSFORMER - 2

I have provided a proper housing for the 50-to-50 Ohm low capacitance transformer and for the 550-to-1 Kohm low capacitance transformer as well.