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Isolator Tuning

Eric Grabowski #183804 Our club was gifted a Sinclair I-2113T ferrite isolator tuned to 152.210 MHz. Can this be retuned for use on 2 meters or is it a paperweight? 73 and aloha, Eric KH6CQ
Eric Fort All Messages By This Member #183805 开云体育 I’ve never seen an isolator you could “tune” to a specific frequency. ?On the other hand I’ve never seen one that lost all matter of directivity if the frequency running through it changed by a couple picohertz. Now granted 10mhz at 2m is not insignifigant and my guess is there may be some performance degradation both in loss and isolation. The question is really, “ is that increased loss and decreased isolation acceptable for your application. My suggestion would be simply to sweep it from say 140-160 and see what you get for isolation and loss. A directional coupler and decent service monitor or spectrum analyzer ought do that just fine as you don’t need phase info for this.? Eric Af6ep Sent using SMTP. toggle quoted message Show quoted text On Jan 23, 2021, at 11:29 AM, Eric Grabowski via groups.io <ejgrabowski@...> wrote: ? Our club was gifted a Sinclair I-2113T ferrite isolator tuned to 152.210 MHz. Can this be retuned for use on 2 meters or is it a paperweight? 73 and aloha, Eric KH6CQ
nj902 All Messages By This Member #183806
Bob Dengler All Messages By This Member #183807 At 1/23/2021 11:29 AM, you wrote: Our club was gifted a Sinclair I-2113T ferrite isolator tuned to 152.210 MHz. Can this be retuned for use on 2 meters or is it a paperweight? I've never had a problem retuning a 152 MHz isolator down to 2 meters. Bob NO6B
STANLEY STANUKINOS All Messages By This Member #183808 开云体育 +/- 10 percent in tuning.? See what they would charge you for a retune. ?It may be a lot cheaper than a new one.? Stan toggle quoted message Show quoted text On Jan 23, 2021, at 1:29 PM, Eric Grabowski via groups.io <ejgrabowski@...> wrote: ? Our club was gifted a Sinclair I-2113T ferrite isolator tuned to 152.210 MHz. Can this be retuned for use on 2 meters or is it a paperweight? 73 and aloha, Eric KH6CQ
Al Lowenstein #183809 开云体育 Sinclair - I2113T-2 - 145-165 MHz Compact Rugged Isolator/ Circulator Should cover 2m well. 5mhz bw. toggle quoted message Show quoted text From: [email protected] <[email protected]> on behalf of STANLEY STANUKINOS <Ka5iid@...> Sent: Saturday, January 23, 2021 2:15 PM To: [email protected] <[email protected]> Subject: Re: [repeater-builder] Isolator Tuning ? +/- 10 percent in tuning.? See what they would charge you for a retune. ?It may be a lot cheaper than a new one.? Stan On Jan 23, 2021, at 1:29 PM, Eric Grabowski via groups.io <ejgrabowski@...> wrote: ? Our club was gifted a Sinclair I-2113T ferrite isolator tuned to 152.210 MHz. Can this be retuned for use on 2 meters or is it a paperweight? 73 and aloha, Eric KH6CQ
Eric Fort All Messages By This Member #183811 开云体育 Interesting, had never seen one that actually tuned Eric Af6ep? Sent using SMTP. toggle quoted message Show quoted text On Jan 23, 2021, at 12:53 PM, nj902 <wb0emu@...> wrote: ?
Matt Lechliter All Messages By This Member #183813 Isolators/Circulators vary. Some are constructed without ability for field tuning. These have a center frequency spec'd at build time with a "broadband tune" of typically +/-10% of the operating freq in MHz. Others will have trimmer capacitors allowing for field tuning. Set for best S21 (Insertion Loss), then trim for best S11, S22 (Port Return Loss). The third adjustment at the reject load will have the greatest effect of S12 (Reverse Isolation) after the others are properly adjusted. The Port 3/Load adjustment shouldn't need much adjustment. Always be sure NOT to mount these against a steel or other ferrous metal plate. Space by at least 3/8" from any such surface. 73, Matt W6XC toggle quoted message Show quoted text On Sat, Jan 23, 2021 at 1:52 PM Eric Fort <Eric.fort.listmail@...> wrote: Interesting, had never seen one that actually tuned Eric Af6ep? Sent using SMTP. On Jan 23, 2021, at 12:53 PM, nj902 <wb0emu@...> wrote: ?
Eric Grabowski #183823 Thanks everyone for your comments and the link. My unit does not have any number following the T in the model number so I'm not sure what frequency range it was for. The catalog lists: I2113T-1 Isolator, single, 60 watt load, tunable, 138-158 MHz I2113T-2 Isolator, single, 60 watt load, tunable, 145-165 MHz I2113T-3 Isolator, single, 60 watt load, tunable, 154-174 MHz At any rate it looks as though it may be tunable down into the 147 MHz range which is where my repeater is. Once I locate a suitable load, I'll give it a try and let you know the results. 73 and aloha Eric KH6CQ On Saturday, January 23, 2021, 12:35:12 PM HST, Matt Lechliter <grandnationalradio@...> wrote: Isolators/Circulators vary. Some are constructed without ability for field tuning. These have a center frequency spec'd at build time with a "broadband tune" of typically +/-10% of the operating freq in MHz. Others will have trimmer capacitors allowing for field tuning. Set for best S21 (Insertion Loss), then trim for best S11, S22 (Port Return Loss). The third adjustment at the reject load will have the greatest effect of S12 (Reverse Isolation) after the others are properly adjusted. The Port 3/Load adjustment shouldn't need much adjustment. Always be sure NOT to mount these against a steel or other ferrous metal plate. Space by at least 3/8" from any such surface. 73, Matt W6XC toggle quoted message Show quoted text On Sat, Jan 23, 2021 at 1:52 PM Eric Fort <Eric.fort.listmail@...> wrote: Interesting, had never seen one that actually tuned Eric Af6ep? Sent using SMTP. On Jan 23, 2021, at 12:53 PM, nj902 <wb0emu@...> wrote: ?
Graham W All Messages By This Member #183835 The isolator from Sinclair can be retuned.. Just do a search and the tuning instructions from Sinclair are out there VE3WGW

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