XTS3000 Question??

Astro25 · Post by **Astro25** » Tue Mar 04, 2003 12:29 pm

I dont know if this was mentioned before but has anyone had any problems droping the band split to 440mhz on any of the watchbuddy/apcosystem xts3000s in the 450-520mhz splits?

Thanks!

jbxx · Post by **jbxx** » Tue Mar 04, 2003 8:18 pm

There have been lots of posts addressing
this exact same question.
Follow the instructions posted earlier to
hex edit the odb. file. Works great.
J.B. AD6WX

Astro25 · Post by **Astro25** » Tue Mar 04, 2003 9:23 pm

I wanted to know if anyone had problems doing it with a WATCHBUDDY radio.

Thanks!

ASTROMODAT · Post by **ASTROMODAT** » Fri Mar 07, 2003 11:12 am

The 403-470 MHz range (or 438-470, depending on which ASTRO P radio you want) is the proper radio to buy if you need 440 for ham use. If you go with a high split, Yes, you can force it down, but the performance will suck. Remember that there are sharp filters (laser tuned) on the front end that have very steep skirts below about 449 MHz.

Check this out for yourself. Get the service manual and notice the HUGE number of frequency sensitive parts/modules involved for the Hi vs/ Lo split UHF radio.

There have been many posts that say you can force it down, etc. O.K., if you can get a radio ultra dirt cheap for ham use, then maybe it's worth it if you can live with the degraded performance. But, if you arte patient, a low split radio will come along and you will have a much better performing radio!

You're fighting a losing battle---wait for a low split radio!

My 2 Cents,

Larry

mike m · Post by **mike m** » Fri Mar 07, 2003 11:24 am

It should have the same front end as any other xts3000 in the 450 to 520 split and I have taken several 450 to 520 xts3000s down to 439.9 MHz without any problems in rx or tx. You can go under 439.9 rx and tx on these radios with some loss in rx sensitivity; however, the tracking values for the receive preselector really droped out when I went below 439 Mhz on every 450 to 520 radio that I have done. The transmitter is more forgiving, IE harmonics were not a problem down to 435 and the modulation held in just like it was operating on 450 and above. You shouldn't have any problem going to 440 on a 450 to 520 radio unless it is a really hacked up radio hardware wise which I'm sure the watchbuddy radios are not.

Mike

ASTROMODAT · Post by **ASTROMODAT** » Fri Mar 07, 2003 12:04 pm

Again, take a look at the service manual!

You will see that the receiver module part number for the 403-470 split XTS3000 is DIFFERENT than the module part number for the 450-520 split.

I don't believe that Motorola did this just for the fun of it.

Just The Facts, Maam!

Astro25 · Post by **Astro25** » Fri Mar 07, 2003 1:25 pm

I just did my radio today and it went rather well with the watchbuddy radio. I dont notice any difference in the performance of the radio so hopefully it stays that way.

jbxx · Post by **jbxx** » Fri Mar 07, 2003 8:09 pm

I was refering to a watchbuddy radio in my previous post.

J.B. AD6WX