On Thu, 13 May 2004 20:30:49 -0500, Jim wrote:

Anyone else having problem with Ten Tec Rx-320 blowing front end
FET's? Any mods to prevent this or is there a replacement FET with
less tendency to short out? This is definitely a design fault, as I
have 3 receivers in parallel on same antenna and the R320 is the only
one blowing FETs.

I sent it to the factory and they were supposed to perform a mod to
prevent this, but it never worked. Wasted $50.00.

Called factory again, their latest solution - - - sending me a bag of
FET's so I can replace them myself.....

Find out the max current handling of the FET and then put a fuse in
line with the out that's rated at that current. You'll just have to
replace fuses once in a while. Don't forget to put it in an easy spot
to get to.

William Everhart wrote:

Find out the max current handling of the FET and then put a fuse in
line with the out that's rated at that current. You'll just have to
replace fuses once in a while. Don't forget to put it in an easy spot
to get to.


A fuse may be too slow to react. A diode or two may be of use. Here's
one set up using a single pole double throw switch to remove the antenna
from the set when not in use AND give protection when connected. Static
protection only, not lightning.


This lets the antenna be grounded when not in use. OA, OC and BO are
terminals on the switch. D1 and D2 are diodes. and are continually
connected between OC and OA. The antenna wire is always connected to common.


antenna in __________
is common |
to ground | to ant. |
------------OA | BO-----------| Radio
| OC to gnd|
D1 |--|--| |------|_________
D2 |--|--| | |__|
|
to ground |
--------------------------------|



mike