Subject: Re: GMRS bands
Newsgroups: gmane.recreation.radio.hardware.kenwood.th-f6a
Date: 2008-03-25 03:35:56 GMT (14 weeks, 4 days, 20 hours and 4 minutes ago)
-----Original Message-----
From: Fred [mailto:glenndriech-/E1597aS9LT10XsdtD+oqA@public.gmane.org]
Sent: Monday, March 24, 2008 08:40 AM
To: TH-F6A-hHKSG33TihhbjbujkaE4pw@public.gmane.org
Subject: Re: [TH-F6A] GMRS bands
__._,_.___ "Blowing the finals" means a "F***ed" PA (power
amplifier) stage because of excess heat and voltages
Take it that your radio's finals are designed for 50
Ohms within ham band limits and need an antenna that
is a 50 Ohm load. Outwith those limits, the PA output
impedance may be very different from 50 ohms.
Therefore the GMRS antenna may not match the PA when
working out of the band it was designed for - even if
the antenna presents as a 50 Ohm load.
If the "finals" cannot transfer energy properly to the
antenna, excess heat and damaging voltages can result.
Despite protection circuits.
The receiver input stage can also be damaged.
Might, can and maybe are downside so why not play
safe? I bet buying a GMRS hand-held would cos t a lot
less than repairing your TH-F6A!
Regards,
Fred.
--- Mark <N2FLF <at> optonline.net> wrote:
> I think he meant by transmitting out of the
> ham band WITH a ham band antenna
> you might damage the final output stage
> by having a high SWR.
> However, if you use an antenna designed to transmit
> on those frequencies you should be OK.
> 73, Mark
>
>
> Sean T. Peotter wrote:
>
> > yes i do realize it, i have no choice for what i
> am trying to
> > accomplish.
> >
> > what do you mean by "blowing the finals"?
> >
> > sean
& gt; >
> >
> > -
> >
> > On Sun, Mar 23, 2008 at 7:58 AM,
> otterouttawater
> > <sean <at> onsupport.org
> <mailto:sean%40onsupport.org>> wrote:
> > > Hi, i am planning on purchasing this radio
> to be able to use it in
> > > conjunction with the 462.5 GMRS bands after
> i have gone through the
> > > mod. my question is, is there a better
> antenna to use for this
> > > frequency?
> > >
> >
> > You do realize that the radio is not type
> accepted for GMRS so it's
> > not legal to transmit there. Mods are not
> needed for receive.
> >
> > Also, since it is outside the band it was
> designed to work in, there's
> > an increased risk of blowing the finals.
> >
> >
>
>
>
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