Robert, The R1225 was never intended to be used in a "heavy duty" application. When marketed in its GR1225 desktop configuration, it was presented as a light-duty, local-area repeater for construction sites and similar low duty-cycle applications. Since the GR1225 included a temperature-controlled fan, Motorola suggested that the power be set to 25 watts when heavy use was expected.
73, Eric Lemmon WB6FLY -----Original Message----- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Robert McNeill Sent: Thursday, July 29, 2010 8:12 PM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] Adjusting low power on an R1225 repeater Is there an issue running one of those at 25 watts continuous? It is a repeater. What was its intent if not to be used in a heavy duty cycle? 73, Robert K5ILS ________________________________ From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Joe Sent: Thursday, July 29, 2010 9:06 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Adjusting low power on an R1225 repeater Thanks Eric, I though there was a caveat to turning it down, but couldn't remember why. I want to experiment with an EchoLink repeater, but I'm not sure that the R1225 UHF hi power could hold up at 25 watts continuous duty. I think I'll do some shopping as you suggest. 73 and Thanks, Joe On 7/29/2010 10:01 PM, Eric Lemmon wrote: > Joe, > > Yes, indeed! The UHF high-power version will likely either go spurious or > burn up if set that low. The only way to go with the radio you have is to > add a 6 or 10 dB power attenuator rated at no less than 25 watts, and set > your TX power at the low end. Admittedly, this is a "kluge" of the first > degree, but hey- you asked! > > Otherwise, try to get your hands on one of the 1-to-10 watt R1225 units, and > you can have a ball. I suppose you could modify your high-power R1225 into > the low-power version, but that is a lot of work, and the opportunities for > permanently damaging the mainboard are legion. > > 73, Eric Lemmon WB6FLY > > > -----Original Message----- > From: Repeater-Builder@yahoogroups.com <mailto:Repeater-Builder%40yahoogroups.com> > [mailto:Repeater-Builder@yahoogroups.com <mailto:Repeater-Builder%40yahoogroups.com> ] On Behalf Of Joe > Sent: Thursday, July 29, 2010 6:45 PM > To: Repeater-Builder@yahoogroups.com <mailto:Repeater-Builder%40yahoogroups.com> > Subject: [Repeater-Builder] Adjusting low power on an R1225 repeater > > > > Hello to All, > > I want to turn the power down on my Motorola R1225 repeater to about 5 > watts. It is the high power UHF version (25-45 watts). The reason for > the low power is to drive a power amp at the output I want to achieve. > Any drawbacks to running the R1225 this low? > > 73, Joe, K1ike >
