When the radio tunes between two of these frequencies the value is interpolated based on the curve of the tuning values. An under board heater with a hot air station makes this rather easy.Ive found an under-board board pre-heater is mandatory to work with this and 630f at 7 l/m of airflow will prevent hurting the board/parts/I've found the sensitivity to be a bit better and no squelch clipping on 3.2kc tone at 7khz of deviation (Most ham rigs on 220 have WIDE deviation!).Software modAll this below is not needed. Switching them to the E filters of the UHF HT1250 is rather easy, as they are just on the underside of the board, not under a shield. I've not messed with it, as it appears to be the same part in the UHF, and doesn't look like it's limiting.Based on the following codes for muratta filtersMuratta filtersE is +- 7.5 (15)F is +-6 (12)G is +- 4.5 (9)The 220 Filters are 12 and 9 Khz wide at the 2nd IF. The mobile and HT use the same filters.In the HT the 1st IF is under the shield, and very hard to remove. Use to access the greyed out menus in tuner 2.16.HT1250 Filters:Function Part Manu P/N Moto P/N Desc220 front end 44.85MHz F元201 MXFM10 4-pole +-7.5khz bandwidthIF2 First filter 455KHz F元204 CFUCJ455F 9180468V04 4-pole 12khzIF2 filter narrow band filter F元206 CFWC455G 9180469V03 6-pole 9khzThe UHF handhelds use the same arrangement, but with a wider middle filter (1st In wide band they switch only the 2nd 2nd IF filter to a narrow band filter.uhf front end 44.85MHz F元01 MXFM11IF2 First filter 455KHz F元02 CFUCJ455E 9180468V05 4-pole.IF2 filter wide band filter F元03 CFWC455E 9180469V05 6-pole.IF2 filter narrow band filter F元04 CFWC455G 9180469V03 6-poleYou'll need to order the parts with the. TX deviation is a setting in programming/alignment.In the 220 version, there 1st IF Filter is the same, but it has a 12KHz and then a 9 KHz filter at the second IF.I've changed out the second filters and found it works much better on the ham bands. It's this last filter that is switched between narrow and wide in the VHF/UHF radios. Transmit will support wide band (and must be aligned for wide band first!) The IF filters simply need to be swapped with their wide band parts and wide band receive alignment performed.Hardware ModTheir are 3 filters in the radio, 1 at 44.85 MHz 1st IF and 2 at 455khz, 2nd IF.In a VHF/UHF Waris there is a 15KHz filter at the 1st IF followed by a 15KHz filter at the second IF and then followed by another filter.
The issue is these radios are narrow band only on the receive path, as the 200 MHz band was never used for 25 KHz channels.
#Commercial series cps r05.18 software
Flash adapter for CDM1250 radio 220 HT1250ls and CDM 1550lsThis is the same as any other to modify to the amateur service from a software perspective. The majority of modification of these radios to amateur service is done with modifications to the codeplug. This is the same area the programing data from CPS is written in, but CPS is unable to change it.
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