DR-1X Repair

DR-1X Repair

Some weeks ago the Yaesu DR-1X repeater decided to give up on power.
Aurelio ON5AFB, Giorgio ON3II, Alex IW0GXY and myself started to troubleshoot the issue to discover that Yaesu sucks. Please read twice: YAESU SUCKS!

Yeasu engineers decided to build a repeater by using a pair of downgraded version of FTM-400 radios and a aluminum radiator stuck on the transmitter with a silicon gen. These radios are build for a duty-cycle of 1-15 not for a heavy-duty cycle therefore the poor 1/32w resistors controlling the MosFet had become charcoal…

Thanks to Max IW0GXY, we managed to install a front-end to the transmitter and thank to the patience of Aurelio ON5AFB, the resistors were replaced with a more powerful one. Aurelio did something better, re-built the cover of the transmitter to have an additional fan directly on top of it. The fan is configured in extraction mode so the air flows from inside to outside reducing the collection of dust.

Jpeg
Final result, the repeater is back in the box.

Jpeg
Drilling holes (Giorgio ON3II on the left and Aurelio ON5AFB on the right)

 

 

Jpeg
Aurelio ON5AFB and Giorgio ON3II drilling holes on the top cover.
Jpeg
Original cover (on the right) and new cover with fan installed (on the left).
Jpeg
New setup, front view.
Jpeg
Overview from the back
Jpeg
Top view of the installation
Jpeg
Detail of the (used and already with dust) fan
Jpeg
Modification of the support and installation of longer screws
Jpeg
Detail of the additional fan and modified cover

3 thoughts on “DR-1X Repair

  1. What makes you think Extraction mode will eliminate the accumulation of dust?
    The air will enter from anywhere it can. The dust will be there.
    I didn’t see you install a filter anywhere. That is what you need to limit the dust intrusion.

    1. The fan hole is bigger than the holes we drill around it therefore the air flow in extraction mode is less than using the fan on the other way around. You are right when you say that there is no filter installed, in fact we had to balance between the risk of having the holes obstruct or air spray the repeater every now and then. Hope it makes sense. 73

Leave a Reply

Your email address will not be published. Required fields are marked *