Re: Why use a purpose built repeater box as a repeater rather than a transmitter, receiver, and controller tied (lashed) together?
|
The old GE mastr ll repeaters were nothing but the same circuits for the most part but the amplifier was available in 2 types.? Intermittent and 100 % duty so to speak.? The only difference was the size of the heat sink.? I am not sure if they did turn the power up or down , but think the mobile was rated for 110 watts were the repeater was rated 100, but a slight turn of a pot would set that.?
For a long time I ran a mastr ll mobile sitting on a table top as a repeater with an external controller.? It was a 110 watt unit and I ran it about 90 watts .? I sat it off the table top an inch or so and had a muffin fan blowing long ways so that the air went past the heat sink and over and under the unit.? Used an AAR GASFET preamp with it. No desense at all.? Probably partly because the preamp was mounted to the 6 cavity duplexer.
Ralph ku4pt
On Sunday, January 17, 2021, 04:19:29 PM EST, Bob Dengler <no6b@...> wrote:
At 1/17/2021 05:24 AM, you wrote:
>On 1/16/2021 10:53 PM, TGundo 2003 via groups.io wrote:
>> To retort:
>>
>> Many, if not most, current "factory" repeaters today are nothing more
>> than 2 mobiles in a box
>
>Not always true.?? For example, the Motorola R1225 repeater appears to be
>a mobile, but the heat sink is much larger than on the regular M1225 mobile.
...and that makes it a "factory" repeater?? No different then adding a fan to a commercial mobile radio, which BTW is what I've been doing for the past 30+ years ;)
Bob NO6B
|
