[1000mp] Protecting Front Ends

[Pete Smith]

In my SO2R station, where I have to listen on one radio while transmitting on the other, I use a small incandescent bulb in series with the loop from ANT OUT to ANT IN, and 2 stacks of 2 1N914 diodes back-to-back in shunt.  Leaving the Mark 5 on the RX antenna all the time ensures that these components are always in series with the receiver input.  The first time you see the bulb light up is an eye-opener.

If the 857 doesn't have such a loop, then just disconnect it with an external relay or by pulling the antenna cable.  Life's too short to spend waiting for your radio to come back from the shop.

73, Pete N4ZR

At 07:41 AM 5/31/2006, George (K8GG) & Marijke Guerin wrote:
>Dear Bryan:
>
>No, it is not safe to have another HF radio connected when operating your FT1000MP Mark V.
>
>Disconnect the antenna to the FT-857D to be safe.
>
>RF, static, lightening strikes, etc., can all damage the front end of any radio connected to any antenna.
>
>I agree with W5JAY and another posting.
>
>I have a friend who lost the front end of an FT1000D that was "grounded" because RF got around the relay and had components damaged.
>This is also typical for ICOM radios and some Kenwood's.
>
>Again, I would not take the chance,
>
>73 & Good luck,    George    K8GG
>----- Original Message ----- From: "VE3QN" <ve3qn at sympatico.ca>
>To: "All about Yaesu 1000mp" <1000mp at mailman.qth.net>
>Sent: Tuesday, May 30, 2006 3:39 PM
>Subject: [1000mp] Protecting Front Ends
>
>
>I recall the discussion a few weeks ago about whether the Mark V receiver was protected when it was transmitting and an antenna was connected to the RX antenna input. Rightly or wrongly, I now have a Front End Protector between my receiving antenna and the Mk V RX input.
>
>I do, however, have another rig - a FT-857D - which is normally off when I'm running my Mark V and I could have the receive antenna connected to it. Is it safe turned off but with an antenna connected when I run 400 watts to my nearby dipole?
>
>Bryan  VE3QN