4/12/16- Last week the T1 which links Roundtop to Haleakala was finally fixed up. It previously had many bit errors which resulted in the system false keying, audio dropouts and no P25 link to Haleakala. This fix also paves the way to get the Hilo machine linked up in P25. Currently, all repeaters are operational. In P25 mode, all repeaters except Hilo and Koko Head are linked. In analog mode, all repeaters except Koko Head are linked. We hope to have P25 linked to Hilo soon.

8/4/15 - On July 31 2015, with major support from WH6DYN, a Quantar was put on the air in Volcano on Big Island. It's linked back to the rest of the system in both P25 and analog modes. Coverage is good in the upper area of the national park, Volcano Village, the golf course and apparently it even gets all the way down to Na'alehu. Going toward Hilo, it gets ratty pretty quickly, but that's to be expected given the terrain- You can just get in with a mobile rig by the Volcano solid waste transfer station.

8/29/14 - XOnet is now completely Quantar! The last remaining Micor at Koko Head was removed from service August 23 and a Quantar replaced it on August 24. Hilo analog repeat was activated late July (SOMEbody left the analog controller power unplugged back in June) Haleakala-Hilo analog link was restored earlier this August.

6/16/14 - The Hilo repeater is back on the air as of around June 2. It was off the air for a while (maybe about 2 years, I can't remember). It has been upgraded to a Quantar and is operating mixed mode analog/P25. It will eventually be linked back to the rest of the system in both modes. Since there is no link currently, it's operating stand alone. If you're in Hilo, give it a shot and test out the coverage for us.

6/7/14 - The Roundtop repeater had a bit of trouble today and died. It turned out to have a dead Station Control Board. I swapped it out with a spare and it's back up. I believe it was down for less than 24 hrs.

4/11/14 - After months of the Kauai-Kaala-Roundtop-Koko Head-Haleakala links being broken (since about September 2013), things are getting restored. As of today, the link segments Kauai-Kaala-Roundtop-Kaneohe are fully operational in both analog and P25 modes. Kauai and Kaala have never been linked on P25 prior to this date- this is a new feature which took quite some effort to get working.

12/21/13 - The Lihue, Kaua'i repeater has been upgraded to a Quantar and is running mixed mode analog/P25 (currently standalone) on 444.925 (PL 123.0). The previous repeater was a Micor on 443.925, which shared the Haleakala frequency. As it turns out, there's quite a bit of overlap and heterodyne you get when you're up high on a mountain. Funny enough, the Kaua'i repeater got out well enough that it made listening to the Haleakala repeater, while your were on Haleakala, very difficult.

11/xx/13 - Although I can't remember what day exactly, Haleakala has been upgraded to a Quantar and is running mixed mode analog/P25 (currently standalone) on 443.925 (PL 123.0). It puts out quite a signal and has very good sensitivity.

7/27/13 - The Kaneohe repeater has been upgraded to a Quantar and is running mixed mode analog/P25. It is also digitally linked to the Roundtop repeater. Unlike many ham P25 systems, there is no vocoding going on through the link.

7/24/13 - Lihue repeater is off air for a frequency change. Unknown when it will be back operational again.

6/21/13 - The Lihue link has been restored. It was broken back in early April. T1 patch cord in the wrong hole in Lihue

3/17/13 - The Kaneohe Repeater has been moved to a new site and is linked to the rest of the system. It is now running a Micor UHF station and should provide outstanding windward coverage from Makapu'u to at least Kualoa (maybe even further)- get out there and try it out. This repeater is also equipped with an Angle Linear preamp and additional bandpass receive filtering. The preamp increased the receive sensitivity by 11db over the stock Micor receiver. Final result is -121 dB (.19 uV) for 20 dB quieting. This is measured through the antenna port of the duplexer. TX power output at duplexer antenna port is 63 watts. It is linked to the rest of the system over a private IP network. It now also has emergency power.

Also, The Lihue repeater has lost its link to the rest of the system (still operating stand-alone)- It will be fixed as time and people are available.

12/17/12 - The Equipment page on the website was updated with photos and info for Roundtop

9/28/12 - The Kaneohe Repeater Link was repaired on the 25th. The cause of the outage was an audio mixer which had failed at RT following a HECO power glitch. The faulty component was a -15 VDC regulator in the mixer power supply.

8/2/12 - The Lihue Repeater Transmitter has been fixed by our statewide traveling technician. The Micor exciter had bit the dust. Special thanks to Nick for diagnosing the problem. On Maui, the intermittent problem with no receive audio has returned after a long hiatus.

7/29/12 - The Mount Kaala Repeater has been transplanted and is now running P25 mixed mode, just like the Round Top repeater. Coverage seems pretty good- You can get in from Lihue fairly solid on a handheld. Kaala is functioning as standalone in P25 mode. For more info, read the below entry of 1/27/12 for operating practice and radio configuration.

3/19/12 - The Lihue Repeater is now on the air at Kilohana on 443.925 (CTCSS 127.3). It was put on the air on March 15. It is currently operating standalone and not linked to the rest of the system. We hope to have it linked to the rest of the XO in the near future.


1/27/12 - As of January 15th, 2012, the Roundtop Repeater was upgraded to a P25 capable, mixed mode repeater. What does that mean exactly? Well, if you have an analog only radio, not much. The repeater will continue to function the same as it always did. There is one thing you should check on your radio however- make sure you are using the Tone Squelch/CTCSS setting (@ 123.0 Hz) so you don't hear the digital noise when the repeater is transmitting P25. In fact, we recommend using Tone Squelch on every repeater that transmits CTCSS for the simple reason that it will make your radio just about impervious to random noise bursts and interference. One more note of operating practice- If you see your RX signal strength or channel busy indicator on (with Tone Squelch enabled), that means the repeater is currently using P25. If you hear the digital hash with carrier squelch, that's the P25. Do not attempt to use the repeater when the channel is busy- you will cause interference to the digital users. The digital users can hear both analog and P25 on the same memory channel.

If you have a P25 capable radio, that's probably some fairly exciting news in Hawaii. In addition to being an analog linked repater, the Roundtop machine now functions as a standalone, P25 conventional repeater on 443.775 with a NAC of BAD. At the time of this writing, there are only a handful of people who use P25 on the Roundtop machine, primarily KH6MP & NH6XO- and even they only have handhelds that are P25 capable. Take note that the P25 mode takes priority over analog traffic on the local repeater. If someone is on analog using the linked system and you transmit P25 to Roundtop, the Roundtop repeater ONLY will instantly go into P25 transmit mode overriding the analog traffic. All other repeaters on the system will be unaffected by the digital traffic, unless of course if an analog user is on the Roundtop receiver as well. The repeater can't do both modes simultaneously- it's either digital or analog at a time.



Last Updated April 12, 2016