Magnum 257

Magnum 257
Documentation Project
CBTricks.com

RX Alignment

1. Set Radio on SSB E band Channel 20 and then adjust T13, T11, T9, T8, T7, T6 and T4 in order several times with decreasing SSG level for maximum sensitivity.
Adjust T1 and T2 at AM and adjust T3 at FM for max sensitivity each in same way as above in SSB.

2. Adjust RV1 (100KB) for "9" S-RF at EMF 46 dB in AM E band Channel 20 and adjust RV402 (50K) so that you just can see RX wave form at EMF 66 dB and squelch volume maximum.

a)	Check if pulse noise decreases more than 3 dB at SSB EMF 16 dB and two pulse generator in parallel.
b)	Fix SSG level at the point S/N ratio becomes -10 dB and make RF-G minimum and then increase SSG level till S/N ratio becomes -10 dB. SSG level should be 50-70 dB.

4. Set Scan button at SSG EMF 6 dB and rotate squelch control till channel number on Display just changes and then check if channel number is same as that of SSG when SSG EMF is 36 dB.

Disclaimer: Although the greatest care has been taken while compiling these documents,

we cannot guarantee that the instructions will work on every radio presented.