80 meter multi turn loop antenna
 

HI,

I'm thinking about building a multi turn loop for 80 meters, using in for TX
and RX purpose.
This would be a loop thats 1 meter big and 5 turns. Is there anyone who has
tried this before?

Jaap PA3DTR

"Jaap" wrote in message
...
HI,

I'm thinking about building a multi turn loop for 80 meters, using in for
TX
and RX purpose.
This would be a loop thats 1 meter big and 5 turns. Is there anyone who
has
tried this before?

I use a 1.4m diam single turn loop for 160-15m which is quite successful on
80m.

The ARRL Ant book says that multiturn loops aren't that much better than
single turn loops if the coils are too close. It might be better to use the
tubing to make a larger (3-4m?) single turn loop. The same source says that
radials can improve mag loop performance. However I found that 3 radials 2x
loop diameter made no difference.

73, Peter VK3YE

"Jaap" wrote in message
...
HI,

I'm thinking about building a multi turn loop for 80 meters, using in for
TX
and RX purpose.
This would be a loop thats 1 meter big and 5 turns. Is there anyone who
has
tried this before?

I use a 1.4m diam single turn loop for 160-15m which is quite successful on
80m.

The ARRL Ant book says that multiturn loops aren't that much better than
single turn loops if the coils are too close. It might be better to use the
tubing to make a larger (3-4m?) single turn loop. The same source says that
radials can improve mag loop performance. However I found that 3 radials 2x
loop diameter made no difference.

73, Peter VK3YE

"Jaap" wrote in message
...
HI,

I'm thinking about building a multi turn loop for 80 meters, using in for
TX
and RX purpose.
This would be a loop thats 1 meter big and 5 turns. Is there anyone who
has
tried this before?

Jaap PA3DTR

================================

A multiturn loop on 80m is hopelessly inefficient for transmitting purposes.
It is roughly 80 dB down on 1/4-wave vertical. Furthermore, for a Tx power
output a lot less than a watt, the volts across the tuning capacitor will be
10Kvolts or more - if you can find or make one.

For the performance of multi-turn receiving loops download program RJELOOP3
from website below.

For the performance of single-turn transmitting loops download program
MAGLOOP4.

--
-----------------------------------------------------
Regards from Reg, G4FGQ
For free radio design and modelling
software go to -
http://www.btinternet.com/~g4fgq.regp
-----------------------------------------------------

"Jaap" wrote in message
...
HI,

I'm thinking about building a multi turn loop for 80 meters, using in for
TX
and RX purpose.
This would be a loop thats 1 meter big and 5 turns. Is there anyone who
has
tried this before?

Jaap PA3DTR

================================

A multiturn loop on 80m is hopelessly inefficient for transmitting purposes.
It is roughly 80 dB down on 1/4-wave vertical. Furthermore, for a Tx power
output a lot less than a watt, the volts across the tuning capacitor will be
10Kvolts or more - if you can find or make one.

For the performance of multi-turn receiving loops download program RJELOOP3
from website below.

For the performance of single-turn transmitting loops download program
MAGLOOP4.

--
-----------------------------------------------------
Regards from Reg, G4FGQ
For free radio design and modelling
software go to -
http://www.btinternet.com/~g4fgq.regp
-----------------------------------------------------