Neil, You know that the Ferrite isolators can be re-tuned you used to be a tech. I was watching Jim re-tune a low band unit last week and it was a Celwave isolator.
Oregon Repeater Linking Group Mike Mullarkey 6539 E Street Springfield, OR 97478 541-747-1303 [EMAIL PROTECTED] www.orlg.org -----Original Message----- From: Neil McKie [mailto:[EMAIL PROTECTED] Sent: Monday, December 27, 2004 9:03 PM To: [email protected] Subject: Re: [Repeater-Builder] UHF Isolators / Harmonic filters Eric, What is your opinion about possible retuning of a low-band isolator? I can get the make / model for you but tomorrow. Thank you, Neil - WA6KLA Eric Lemmon wrote: > > Doug, > > Rather than download the entire catalog, those interested in the > isolators can simply download the 750K portion that applies to > the UHF isolators at: > > <http://www.emrcorp.com/catalog/FullLine/ISOCIRC/ISOCIRC_300_650.pdf> > > Ferrite isolators are custom-manufactured to order, and the > components are ground and/or selected to operate on the exact > frequency specified. > > A UHF isolator can usually be tuned +/- 5 MHz from the original > frequency it was made for, and still be within specifications. EMR > will remanufacture both their own and some other brands to operate > properly in the 70cm Amateur band for a modest fee. > > 73, Eric Lemmon WB6FLY > > doug wrote: > > > > i have the following equipment available @ "best offer" this gets offered here before it goes to fleabay > > > > 2 ea EMR CORPORATION UHF double isolators w/ loads p/n 8550-34 link here: > > http://emrcorp.com/images/catalogs/Full_Line_Catalog.pdf > > > > item is on page 14, WARNING - HUGE 40meg file (full catalog from emr) and > > > > 2 ea DB 4332-B UHF harmonic filters w/ N male factory cables > > > > link here: http://www.ecwest.com/shopping/buy.asp?prid=301334 > > > > These were in service in a UHF data system and were removed when the system > > was replaced. there is some paint missing on the harmonic filters, > > probably from banging around against each other in the plastic baggie. > > > > pictures to those who really want them. > > > > all items are on 461.xxx freqs and from what i can tell in the literature > > are re-tunable to the ham band (400-520 MHz). > > > > email me OFF THE LIST, please. > > > > doug > > > > > > Yahoo! Groups Links > > > > > > > > > > > Yahoo! Groups Links > > > > Yahoo! Groups Links Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
