I think you are asking too much of the HT750. I ordered Range 1 UHF
HT750 radios for my employer, planning for interoperability with a
nearby Government agency, and it is remarkable that the radios meet all
specs over the 403-470 MHz range. I have tried to program them above
470 MHz, with no luck. The design engineers at Motorola advised me that
both the software and the firmware will block any operation out of
band. I think that's a reasonable position, given that the "design
rules" have already been stretched to achieve a 67 MHz bandwidth.
In your case, you want to make a Range 2 UHF radio meet all specs below
450 MHz, and I don't think you can make that happen. Even if you could
hack the software and firmware to override the bandedge blocks, your
radio would not be performing anywhere near its in-band capability. And
performance is a hallmark of Motorola.
I congratulate you on your desire to use a commercial-quality radio on
the Amateur bands, but I think you're going to need two radios to
satisfy your wideband objectives. Yeah, I personally like the
"DC-to-light" capabilities of some wideband Amateur gear, but that
capability brings along a lot of limitations!
73, Eric Lemmon WB6FLY
mch wrote:
>
... Do you know of any way to program ham repeaters in a 450-527 MHz
split HT750? I would just change
> the split to a low one, but I need to keep the 470-476 MHz segment...
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