They are notch only devices and I've used "similar" devices using that helical design for years.
If you don't have a lot of noise on/around site washing over your receive freq, they will get the job done. Kb0wlf From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of James Cicirello Sent: Monday, July 05, 2010 4:19 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] MASTR II LOW BAND TUNING Hi Again Eric, When you get a chance will you look at these duplexers and give me your opinion? http://www.radiodata.com/fiplex/products/PDFs/DHV05.pdf The duplexer I got with the repeater is the Model DHV-0544.( THE 533 has been discontinued) The way I am reading their specs it is 90 dB at 1 MHz, Anyone else wish to comment, Chuck you have some 6 meter machines too. I just got these from the owner today and am looking for advice, opinions, etc. This is a new product that he spent a lot of bucks on, so I am looking for opinions, anybody that may have experience with these duplexers, to include a split site Vs these duplexers. Thanks all.... 73 JIM KA2AJH Wellsville, N.Y. On Mon, Jul 5, 2010 at 2:23 PM, Eric Lemmon <wb6...@verizon.net> wrote: Jim, A low-band repeater with a flat-pack duplexer having 90 dB of isolation? That's amazing! My low-band repeater uses four 12" diameter cans that each stand about five feet tall. Your MC74AAU33A radio is an M-series 100 watt mobile radio, covered by PC-61 here: <www.repeater-builder.com/ge/product-code-indexes/index-pc61-mastr-ii-m-seri es-mobiles.pdf> The transmitter tuning information is covered in LBI-4898, available at the link I gave you earlier. It is not a full-page version, but it will have to do until we can borrow a paper copy to scan. If any readers of this list have a clean and complete original LBI-4898 that we can borrow for full-page scanning, please contact me directly at mycall at verizon dot net. 73, Eric Lemmon WB6FLY -----Original Message----- From: Repeater-Builder@yahoogroups.com <mailto:Repeater-Builder%40yahoogroups.com> [mailto:Repeater-Builder@yahoogroups.com <mailto:Repeater-Builder%40yahoogroups.com> ] On Behalf Of James Cicirello Sent: Monday, July 05, 2010 9:54 AM To: Repeater-Builder@yahoogroups.com <mailto:Repeater-Builder%40yahoogroups.com> Subject: Re: [Repeater-Builder] MASTR II LOW BAND TUNING Hi Eric, First thanks you for pointing me to the manuals and Don for the NHRC Tuning site. Eric the combination numbers are MC74AAU33A. They came from a trucking company and I think they are on 47.XXX. I am taking over the Wellsville 53.090 Repeater as the original owner is re-locating. He has a custom built repeater MASTR II from Repeater Builder going thru a rack mount flat pack duplexer with about 90 Db of isolation, but there is also 2 Db of receiver loss thru the cans. I have two sites 6 miles apart and I want to try split sites using the above mentioned GE as the TX and use the HOT RX on the custom Repeater for the RX. I am in hopes that all I have to do is tune the TX and hook it to the link radio. 73 JIM KA2AJH On Sun, Jul 4, 2010 at 8:39 PM, Eric Lemmon <wb6...@verizon.net <mailto:wb6fly%40verizon.net> <mailto:wb6...@verizon.net <mailto:wb6fly%40verizon.net> > > wrote: Jim, Perhaps you are not aware that Repeater-Builder has a huge index of General Electric manuals. Just look at any "Description & Maintenance" manual for a low-band radio to get the tuning instructions. Since you did not specify exactly which low-band radio you have, any of these LBIs will probably get you going: <www.repeater-builder.com/ge/lbi-library/lbi-4896.pdf <http://www.repeater-builder.com/ge/lbi-library/lbi-4896.pdf> > <www.repeater-builder.com/ge/lbi-library/lbi-4898g.pdf <http://www.repeater-builder.com/ge/lbi-library/lbi-4898g.pdf> > <www.repeater-builder.com/ge/lbi-library/lbi-30104b.pdf <http://www.repeater-builder.com/ge/lbi-library/lbi-30104b.pdf> > <www.repeater-builder.com/ge/lbi-library/lbi-30293a.pdf <http://www.repeater-builder.com/ge/lbi-library/lbi-30293a.pdf> > Please be aware that even a high-split (33 range) radio may need modification to perform well in the Amateur 6m band. What is the Combination Number of the radio you want to tune? 73, Eric Lemmon WB6FLY -----Original Message----- From: Repeater-Builder@yahoogroups.com <mailto:Repeater-Builder%40yahoogroups.com> <mailto:Repeater-Builder%40yahoogroups.com <mailto:Repeater-Builder%2540yahoogroups.com> > [mailto:Repeater-Builder@yahoogroups.com <mailto:Repeater-Builder%40yahoogroups.com> <mailto:Repeater-Builder%40yahoogroups.com <mailto:Repeater-Builder%2540yahoogroups.com> > ] On Behalf Of James Sent: Sunday, July 04, 2010 3:46 PM To: Repeater-Builder@yahoogroups.com <mailto:Repeater-Builder%40yahoogroups.com> <mailto:Repeater-Builder%40yahoogroups.com <mailto:Repeater-Builder%2540yahoogroups.com> > Subject: [Repeater-Builder] MASTR II LOW BAND TUNING Hi Guys, Is there a link to tuning a low band mastr II? I have googled and find all kinds of VHF High and UHF but not Mastr II Low. I want to tune to six meters. Thanks JIM KA2AJH -- KA2AJH Jim Cicirello 181 Stevens Street Wellsville, N.Y. 14895 (585)593-4655 -- KA2AJH Jim Cicirello 181 Stevens Street Wellsville, N.Y. 14895 (585)593-4655 No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.5.439 / Virus Database: 271.1.1/2962 - Release Date: 07/05/10 06:36:00
