CBRT has been

Mosfet amplifier 10-12 meter radio swr.

This is the forum for asking questions about linear amplifiers or power supplies.
Post Reply
User avatar
Windwalker
Verified
Moderator
Moderator
Posts: 432
Joined: Feb 19 2011, 21:03
Handle: Windwalker
Real Name: Clifford Stewart
Call Sign: KD8QHS
Antenna: K-40// Hustler MagMnt
Radio: Cherida S890
Contact:

Mosfet amplifier 10-12 meter radio swr.

#411890

Post by Windwalker »

Hi Folks.
A few questions ??
My mosfet amplifier has a decent swr at the antenna even though I travel a wide frequency range. (24-30 MHZ ) The amplifier is rated up to 2.5 to 1 swr which is high. The swr between the amp and the radio is too high as the radio needs 1.5 to 1 or better. This condition is almost making any swing on am or fm non existent. So my questions are
1. How can I reduce the swr between the 10-12 meter radio and the mosfet amplifier ??

2. Should I run an swr meter between the radio and the mosfet amplifier and one between the amplifier and the antenna.

3. Would a tuner fix the whole problem between the amp and the antenna.

4. Not the best idea but should I set the swr from the radio to the antenna and then remove the meter and install the amplifier running it with no meter just checking things frequently.

It is a high drive amplifier that can take up to 35 watts drive !! The radio does about 35 - 40 watts depending on the mode of operation and the swr at the given frequency.

Any help would be great..

Windwalker Global...

P.S.
Hi Juck !!
User avatar
MDYoungblood
Verified
Site Admin
Site Admin
Posts: 10,798
Joined: Jun 12 2010, 20:05
Handle: MDYoungblood
Real Name: Gregory
Antenna: HyGain AV-6160
Radio: Icom IC-746 (non pro)
Contact:

#411905

Post by MDYoungblood »

You will probably need an antenna tuner, I don't know of any antenna with that much bandwidth. There are several version of the Chinese tuner that have a SWR meter built in and they run around $100.

auto tuner.jpg

3's

Greg
You do not have the required permissions to view the files attached to this post.
"321, West Manchester Township, PA"

Official Moderator - CBRT Complaint Department
User avatar
Windwalker
Verified
Moderator
Moderator
Posts: 432
Joined: Feb 19 2011, 21:03
Handle: Windwalker
Real Name: Clifford Stewart
Call Sign: KD8QHS
Antenna: K-40// Hustler MagMnt
Radio: Cherida S890
Contact:

#411907

Post by Windwalker »

Thanx Blood
I found a way to reduce the swr between the radio and mosfet amp.

WW Global
Post Reply