Eric-- The reason that the duplexer you received in your station had an isolation of >100 dB was that the tuning was done using a network analyzer by a qualified technician. That is typical for these duplexers using a network analyzer. I seriously doubt that anywhere near those numbers are achievable using the tuning method described in the Motorola instructions. Also the instructions do not relate how the return loss specifications at the ant, xmit, and rec ports can be made or determined. The RFS - Celwave manual for this series of duplexers ran some 42 pages which included the response curves shown on the network analyzer and were normally included with the duplexers shipped from Celwave to Motorola. Allan Crites WA9ZZU
--- On Wed, 4/22/09, Eric Lemmon <[email protected]> wrote: From: Eric Lemmon <[email protected]> Subject: RE: [Repeater-Builder] Motorola RFS Celwave 0185417U02 VHF Duplexer To: [email protected] Date: Wednesday, April 22, 2009, 7:49 PM San, The Motorola 0185417U02 is equivalent to the Celwave PD5042-1-50 duplexer, which is designed for a 5 MHz split. The Motorola 0185417U02 is NOT equivalent to the Celwave PD5042-1-05, which is designed for a 500 kHz split. The numbers you quote suggest that your duplexer was neither designed for, nor suitable for, 2m operation. 73, Eric Lemmon WB6FLY -----Original Message----- From: Repeater-Builder@ yahoogroups. com [mailto:Repeater-Builder@ yahoogroups. com] On Behalf Of Sangeeth Musaliar Sent: Tuesday, April 21, 2009 9:36 PM To: Repeater-Builder@ yahoogroups. com Subject: RE: [Repeater-Builder] Motorola RFS Celwave 0185417U02 VHF Duplexer James, I managed to tune this duplexer for 2 meter band with RX loss 1.8 & TX 2.5 dB. Isolation was about 78dB. 73 's SAN VU2CEO, A45WH From: Repeater-Builder@ yahoogroups. com [mailto:Repeater-Builder@ yahoogroups. com] On Behalf Of Eric Lemmon Sent: 22 April 2009 05:27 To: Repeater-Builder@ yahoogroups. com Subject: RE: [Repeater-Builder] Motorola RFS Celwave 0185417U02 VHF Duplexer James, The Motorola part number 0185417U02 is a Celwave model PD5042-1-50 duplexer that has been optimized for the 144-160 MHz band. It is option X182AB when ordering a duplexer with a Quantar or MTR2000 station. Motorola duplexer 0185417U01 is optimized for 132-146 MHz, and 0185417U03 is optimized for 158-174 MHz. I just purchased this exact duplexer for a commercial VHF repeater, and its performance is awesome- better than 100 dB isolation between TX and RX. I have posted the 11-page manual in the MTR2000 folder in this group's files section. 73, Eric Lemmon WB6FLY -----Original Message----- From: Repeater-Builder@ yahoogroups. com <mailto:Repeater- Builder%40yahoog roups.com> [mailto:Repeater-Builder@ yahoogroups. com <mailto:Repeater- Builder%40yahoog roups.com> ] On Behalf Of James Delancy Sent: Tuesday, April 21, 2009 5:16 PM To: repeat...@yahoogrou ps.com <mailto:Repeaters% 40yahoogroups. com> ; Repeater-Builder@ yahoogroups. com <mailto:Repeater- Builder%40yahoog roups.com> Subject: [Repeater-Builder] Motorola RFS Celwave 0185417U02 VHF Duplexer Anyone got the spec sheet on this unit?? I am trying to find the original RFS sheet on this (which seems pretty near impossible since EMR acquired the rights to it). Also, does anyone have the actual RFS part number? Thanks! James WJ1D
