A friend of mine is building me a switching arrangement with a reed relay to switch between my transmit antenna and a receive delta loop to the one antenna input for my Ten Tec Jupiter (I operate at
Not lkely, I think, Jim. I presume the FET would have some significant bias ( perhaps 5-12 V) on its drain when it is not conducting, so relatively large signals are not very likely to produce non-li
Hello Jim, 3x fast relays, 2x switching transistors, 3x resistors and box with connectors... You have KD9SV front-end saver. No diodes, no RX performance degradation. I never had issue on my K3 with
Hi Jim and gang, I use protection diodes on the front end of my W1FB preamps (as well as before an IC amp in the preamp, and on the output of the preamp) and have never been able to detect receiver p
I use protection diodes on the front end of my W1FB preamps (as well as before an IC amp in the preamp, and on the output of the preamp) and have never been able to detect receiver performance degrad
Hi Tom, You said : "What works OK in one place will almost always not work the same in another" You just confirmed what I was trying to say, and that is in some applications it just might work. If I
On 01/17/2014 09:51 PM, Tom W8JI wrote: Intermod is a function of the TOTAL voltage of all the signal sources at the point where the diodes are. This is why some systems work with diodes, and some sy
On 01/18/2014 06:20 AM, N1BUG wrote: Indeed. I've had problems with ICE 196 receiver protectors for several years. I assume the intermod is generated by the diodes in those devices, though I do not k
Thanks to all for the insightful replies/advice. It would appear the use of clamping FETs is worth a try... 72, Jim R. K9JWV _________________ Topband Reflector Archives - http://www.contesting.com/_
Indeed. I've had problems with ICE 196 receiver protectors for several years. I assume the intermod is generated by the diodes in those devices, though I do not know that for a fact. The problem occu
Jim, Getting directly back to your original question, I built a KD9SV preamp, and it has clamp diodes included in the design (I did not add them, they were part of the original design by KD9SV). Does
Oooops - sorta!! Checked the schematic for the KD9SV pre-amp I have and find it does have clamping diodes at the input...DUH.....so, question/problem/concern resolved, in spite of myself!! Hi Hi Tnx
When I build a preamp I install the cupped machine pins from an IC socket in the protection device mounting holes so that I can experiment with different protective devices and easily replace devices