reciever does quiet after tune

[KD7PY]

only notice this on 75 mtrs. went into tune and then back to receive and the receiver sensitivy dropped way down..the band noise was S9 and after tune it dropped to S5.
just keying the mike with out talking a few times would restore it back to normal.
i can repeat it often but not every time...
can also make it happen by just keying the mike,
ED

[w0mu]

Sounds like a relay might be sticking.


"A slip of the foot you may soon recover, but a slip of the tongue you may
never get over." Ben Franklin
-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of K7WIA
Sent: Monday, March 09, 2009 10:24 PM
To: [hidden email]
Subject: [Elecraft] reciever does quiet after tune


only notice this on 75 mtrs. went into tune and then back to receive and the
receiver sensitivy dropped way down..the band noise was S9 and after tune it
dropped to S5.
just keying the mike with out talking a few times would restore it back to
normal.
i can repeat it often but not every time...
can also make it happen by just keying the mike, ED
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[KD7PY]

Seams like it don't like high SWR
I checked my SWR  ( don't have the ATU  but a external tunner) and it was 1.8:1
tweeked the tuner to lower the SWR and now every thing seems OK

[MontyS]

I am experiencing this intermittently as well.  Have not yet found what is
necessary to reproduce it.

Monty K2DLJ

--------------------------------------------------
From: "K7WIA" <[hidden email]>
Sent: Tuesday, March 10, 2009 12:23 AM
To: <[hidden email]>
Subject: [Elecraft]  reciever does quiet after tune

>
> only notice this on 75 mtrs. went into tune and then back to receive and
> the
> receiver sensitivy dropped way down..the band noise was S9 and after tune
> it
> dropped to S5.
> just keying the mike with out talking a few times would restore it back to
> normal.
> i can repeat it often but not every time...
> can also make it happen by just keying the mike,
> ED
> --
>

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[Dick Dievendorff]

I had a problem like this with another manufacturer's radio.  After
transmitting I would hear full volume, then it would quiet down and it took
a blast of RF to restore sensitivity.  

It turned out to be a corroded connector on the linear loading wires of my
40 meter antenna.

I would also look for a relay somewhere along the path (in a linear, or an
antenna switch) that might need a piece of paper slid between the contacts.

Dick, K6KR


-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of Monty Shultes
Sent: Tuesday, March 10, 2009 4:34 AM
To: K7WIA; [hidden email]
Subject: Re: [Elecraft] reciever does quiet after tune

I am experiencing this intermittently as well.  Have not yet found what is
necessary to reproduce it.

Monty K2DLJ

--------------------------------------------------
From: "K7WIA" <[hidden email]>
Sent: Tuesday, March 10, 2009 12:23 AM
To: <[hidden email]>
Subject: [Elecraft]  reciever does quiet after tune

>
> only notice this on 75 mtrs. went into tune and then back to receive and
> the
> receiver sensitivy dropped way down..the band noise was S9 and after tune
> it
> dropped to S5.
> just keying the mike with out talking a few times would restore it back to
> normal.
> i can repeat it often but not every time...
> can also make it happen by just keying the mike,
> ED
> --
>

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[KD7PY]

Thanks Dick....you hit it on the head.....dirty switch for the inductor on the MFJ ant tunner...
every thing fine now..

Ed