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| THE NL3ASD MODIFICATION FILES - THE HAM RADIO MODIFICATION - PAGES PAGES E TO H | HOMEPAGE |
FT736R.6 Subject: FT736R - VHF Attenuator Mod A little trick to built in an RX-Attenuator in the FT736R (VHF Band) Heìlo FT736 fans, Using a preamp in the VHF Band causes sometimes trouble with noise on this band. The S-Meter readout 2-4 without any signal. The AGC is working only to reduce the noise. A simple trick decrease the sensivity for about 6 dBm. Look in the schematic-diagramm 144 MHz MAIN-UNIT. The first RX-Stage is at the left side of the sheet. Locate the transistor Q01 3SK122L and look at the source-resistor R02 (47 Ohm). A second resistor with the value 1.2 KOhm in series with R02 decrease the sensivity for 6 dB. Using the preamp-switch (this switch has a free row) You can easyly switch between attunation and normal use by making a bridge over the new 1.2 KOhm Resistor with this contacts. I think, this trick is not a excellent way of a RX-Attunator, but it works ufb here in my rig. By the way, remember of loosing warrenty bù modify Your rig ! I am not responsable for failures after modification ! Vy 73 de Guenter DD9ZOSOURCE: The QRZ Windows Ham Radio CDROM
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