[Yaesu] FRDX 400 Receiver

[Steve Sutfin]

Hi Mark, here are my thoughts.
  It appears that the AF gain control is at least working as is the S  
meter, although stingy. The first thing I do with an older rig is  
clean and clean again all the relevant pots with whatever your choice  
of cleaner is. Spray and work those pots a bunch to clean out any  
built up junk. If it's been sitting for years that's my obvious first  
step. Then check all solder joints and start checking whatever  
resistors are in the circuit. Voltages up is a good sign but again I  
think cleaning an older rig produces wonders. Besides it's the fun part.
Oh yeah, Yaesu manuals do require a translator.
73,
Steve k7dna


On Jul 19, 2019, at 6:18 PM, Mark V Johnson wrote:

> Team,
>
>
>
> I picked up a Yaesu FRDX 400 at a Hamfest last week and have been  
> able to
> get it going after many years of sitting.
>
>
>
> I'm not overly familiar with this radio and I have a couple of  
> questions for
> those that have one of these.
>
>
>
> The first is the audio. It seems that I need to have the AF gain  
> control at
> about 60% to get usable audio.
>
>
>
> Second question, it seems that the S Meter is very stingy. I have  
> the S
> Meter sensitivity pot at max and I can get slightly over S9 on  
> strong SSB
> signals.  Is this "normal?"
>
>
>
> ALL voltages are on the money. I did replace cathode resistors in  
> both IF
> tubes - 6BA6's and that brought the gain up, and all other circuits  
> seem to
> be OK.
>
>
>
> Ya gotta love early Yaesu manuals. Takes a lot of patience and reading
> between the lines to figure out what the manufacturer is saying...
>
>
>
> Many tnx.
>
>
>
> 73's.
>
>
>
> Mark V Johnson
>
> VE3LU
>
>
>
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