[1000mp] Mark V Field Power Output Mod

[Deon Erwin]

Yaesu received specific user requests for a "field friendly" model of the
MarkV.  Users wanted the facilities of the MarkV in a package that could be
used in the field and on Dxpeditions and operate from a battery supply.
Yaesu responded by designing the lower power 13,8V model, included a carry
handle and called it the Field.

The finals in the Field are different and require 13,8V, where the finals in
the MarkV require 30V for 200W output.  Also, the Field's power supply is
only rated at 20A, such as normally used for 100W radios.

Interestingly, Yaesu left the scale of the power output meter to read 200W,
which may give the impresssion that the Field is capable of 200W.  I presume
it was done to save costs by reducing the component inventory between to two
models.

Although the Field is designed as a heavy-duty transceiver by ham radio
standards, I would be hesitant to perform any power output modification.
The increased thermal stressess could result in problems or premature
failure.

Deon ZS1ZL

----- Original Message -----
From: "D. J." <dalej2 at mac.com>
To: "Sean Fleming K8KHZ" <k8khz at yahoo.com>; "All about Yaesu 1000mp"
<1000mp at mailman.qth.net>
Sent: Tuesday, August 03, 2004 10:56 AM
Subject: Re: [1000mp] Mark V Field Power Output Mod


I thought the field used different finals than the 200 watt version.
Also the heat sink is different and the PS is smaller.  Sounds
adventurous.

Good luck

Dale


On Aug 3, 2004, at 1:22, Sean Fleming K8KHZ wrote:

> After seeing this post I am now thinking of boosting the power on my
> Mark V
> Field. I have the lastest model the 100W one with the built in power
> supply.
> Though I wonder if the power supply inside will handle the power
> increase.
> Ayone check into that? I would consider calling Yaesu to find out. If
> I do
> this then it would be  nice to just go up to like the full 200W has
> anyone
> tried that on an anylyzer at all? I would use it for contesting.
>
> Sean K8KHZ
>   Then on SSB I would have the full 100W signal and 200 on CW HEHEHE.