[Yaesu] Fw: MP Question ...(fix for poor sensitivity on 80)

[Tyler Stewart]

-----Original Message-----
From: Tyler Stewart <k3mm@erols.com>
To: Billy W. Cox Jr <aa4nu@ix.netcom.com>; .yaesu@contesting.com
<.yaesu@contesting.com>
Date: Thursday, November 27, 1997 17:06
Subject: Re: MP Question ...(fix for poor sensitivity on 80)


>
>That's not normal, but I have a good guess as to what's wrong.
>
>First, try feeding your antenna into the RX IN jack instead of the A or B
>jack.
>This effectively bypasses the frontend LP/HP filter board.
>
>If it no longer drops, I can almost guarantee that the first coil in the HP
>filter used on 80 is partially shorted.  I've had a couple go bad here.  I
>think I'm going to try and find a replacement with higher ratings. The part
>designator is L3503, part no: L1790049.  I've replaced it once in each of my
>MP's with original parts and so far, no more problems.  It may just be they
>had a bad run of coils.
>
>Again, this is on the HPF board which is very easy to get to...it's right
>behind
>the ALC board (under the top hatch).  So if you are OK with an iron, you can
>do it yourself easily.
>
>73, Ty K3MM
>From: Billy W. Cox Jr <aa4nu@ix.netcom.com>
>To: Tyler G Stewart <k3mm@erols.com>
>Date: Thursday, November 27, 1997 05:29
>Subject: MP Question ...
>
>
>>Tyler,
>>
>>I can't help with the MP-CT problem as I to date
>>have had good luck with NA and TR ...
>>
>>But I just 'noticed' something here on both MPs,
>>would you check it there on yours ... please ...
>>
>>Go to say 3502 and note the background noise
>>level on rcve ... now roll down to 3499 ... Did
>>the LEVEL of the background noise change ?
>>Here it goes UP when you go below 3500 to
>>what is really should be ... 3500.00 and above
>>it's "too quiet" as in several S-units ...
>>
>>Please do the above and see what changes
>>you notice there ... and let me know ...
>>
>>Ideas ?
>>
>>Thanks !
>>
>>73 Billy AA4NU    aa4nu@ix.netcom.com
>>
>>
>
>


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