[Repeater-Builder] Re: Celwave CC460-A circulator
Martin, I scanned the tuning instructions for a PHD460-C isolator and put it in the FILES section. The link is below. Tuning should be similar/same. 73, Joe, K1ike http://groups.yahoo.com/group/Repeater-Builder/files/Celwave%20Isolator%20Info/ --- In Repeater-Builder@yahoogroups.com, cruizzer77 atlant...@... wrote: Does anyone have a datasheet or tuning instructions for this kind of circulator? It's a single stage with 3 adjustment screws and right now the sticker says it's on 420 MHz and I would like to know how I get a working range from 430 to 440 MHz. If somebody can explain without the doc this is fine as well. 73 Martin
RE: [Repeater-Builder] Celwave CC460-A circulator
The simplified instructions for tuning an isolator are: 1. Tune input (tx port) for maximum return loss with antenna port terminated in 50 ohms and reject load connected to reject port 2. Tune output (antenna port) for minimum insertion loss, sweeping from tx port to antenna port, again with reject load connected to reject port 3. Tune reject port for maximum isolation (i.e. best match into load), sweeping from antenna port to transmitter port, adjusting for minimum amplitude 4. Repeat. If you're trying to use it far from its design frequency, you may not get it to meet spec, or you may find that the return loss maximum in step #1 doesn't align well with insertion loss minimum in step 2, or other similar performance problems. The Celwaves usually tune over a fairly broad range, so I think you have a good chance of having it work right, assuming you have the right test equipment to tune it. --- Jeff WN3A -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of cruizzer77 Sent: Wednesday, August 18, 2010 3:19 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Celwave CC460-A circulator Does anyone have a datasheet or tuning instructions for this kind of circulator? It's a single stage with 3 adjustment screws and right now the sticker says it's on 420 MHz and I would like to know how I get a working range from 430 to 440 MHz. If somebody can explain without the doc this is fine as well. 73 Martin
Re: [Repeater-Builder] Polyphaser Question
If you have a problem with a ground due to terrain issues, you might want to look into using Lyncole grounding rods. These are hollow copper tubes with a chemical crystal compound inside. The rod has some tapes around breather holes which you remove prior to burying in betonite clay etc.. The top of the rod is left just above ground in a round housing / inspection cover. These create temperature differential between top and bottom and create moisture condensation which leaches out and creates a better ground over time. There is also a L shaped grounding rod which is laid in a trench in case you can't dig down 8ft or so. Usually only one or two rods are required to achieve the 4 ohms. Peter On Thu, Aug 19, 2010 at 12:01 AM, Tim tahr...@swtexas.net wrote: This has been a very interesting thread to watch, and most of the installations that I've done have been 'add-ons' to existing well designed systems. On a different note, I'm now working on a solar powered system, and was wondering about the grounding there. Everything will be mounted on a single pole, which will be several feet in the ground. I had planned to make a ground system in a 3 or 4 'spoke' design, with a ground rod at each end of the spoke. There will also be a ground rod within several inches of the pole. Each spoke and the pole will be tied together at a common point. I haven't put any of the rods into the ground here... I use the term 'ground' somewhat loosely.. there is a LOT of rock on the tops of these hills here. Not sure I'll be able to get them all the desired depth. Anyhow, suggestions and comments are welcome. The pole will not be the tallest thing on the hill, there are several Oak trees that will be higher. Provide any cover? Thanks, Tim
Re: [Repeater-Builder] antenna plan
Hopefully it is not uncool to be the first to respond to one's own post. I'll take the fact that there was no flood of flames, or naysayers, to indicate that my plan is worth attempting. So as a follow-up question, I would ask, could anyone offer recommendations for a yagi, corner reflector, or other directional antenna, suitable for duplex use, with a beamwidth of no less than 30deg and a gain of no less than say 7dB? 73 Paul - Original Message - From: Paul Holm I'm looking for input on an antenna plan. I'd like to change to an ellliptical pattern that favors the bigger town in the county which is roughly at 270 deg west and about 6 miles away. I'd like to take a yagi or corner reflector and mount it lower, at the railing or a short distance up the mast, and point it at the town I'd like to focus on
[Repeater-Builder] Kenwood TK-690H 29.5-37 MHz, Type 1 radio(s) wanted
Does anyone have or know of someone that would part ways with a Kenwood TK-690H Type 1 low-band commercial rig? Type 1 is the low split, 29.5 to 37 MHz. I would like to purchase 1 or 2 of the units to try on 10-meters. Thanks everyone! -- James Adkins, KB0NHX Vice-President -- Nixa Amateur Radio Club, Inc. (KC0LUN) www.nixahams.net Southern Missouri Assistant Frequency Coordinator - Missouri Repeater Council www.missourirepeater.org The Nixa Amateur Radio Club - There is no charge for awesomeness! (Well, only $1.00 per month)
Re: [Repeater-Builder] antenna plan
I had a corner reflector on my very first UHF ham repeater for a while. No problems with duplex operation or anything. The pattern was pretty much as you see in the catalogs. The front to back ratio was remarkable. After a while, I got some more money and changed it out. Best Regards, W1EL Eric Lowell Eastern Maine Electronics Inc. 48 Loon Road Wesley ME 04686 eme@starband.net www.satnetmaine.com 207-210-7469 From: Paul Holm p...@chargertech.com To: Repeater-Builder@yahoogroups.com Sent: Thu, August 19, 2010 10:25:51 PM Subject: Re: [Repeater-Builder] antenna plan Hopefully it is not uncool to be the first to respond to one's own post. I'll take the fact that there was no flood of flames, or naysayers, to indicate that my plan is worth attempting. So as a follow-up question, I would ask, could anyone offer recommendations for a yagi, corner reflector, or other directional antenna, suitable for duplex use, with a beamwidth of no less than 30deg and a gain of no less than say 7dB? 73 Paul - Original Message - From: Paul Holm I'm looking for input on an antenna plan. I'd like to change to an ellliptical pattern that favors the bigger town in the county which is roughly at 270 deg west and about 6 miles away. I'd like to take a yagi or corner reflector and mount it lower, at the railing or a short distance up the mast, and point it at the town I'd like to focus on I
RE: [Repeater-Builder] Polyphaser Question
Tim tahr...@swtexas.net wrote: This has been a very interesting thread to watch, and most of the installations that I've done have been 'add-ons' to existing well designed systems. On a different note, I'm now working on a solar powered system, and was wondering about the grounding there. Everything will be mounted on a single pole, which will be several feet in the ground. I had planned to make a ground system in a 3 or 4 'spoke' design, with a ground rod at each end of the spoke. There will also be a ground rod within several inches of the pole. Each spoke and the pole will be tied together at a common point. I haven't put any of the rods into the ground here... I use the term 'ground' somewhat loosely.. there is a LOT of rock on the tops of these hills here. Not sure I'll be able to get them all the desired depth. Anyhow, suggestions and comments are welcome. The pole will not be the tallest thing on the hill, there are several Oak trees that will be higher. Provide any cover? Thanks, Tim Tim , when I needed to add ground rods in rocks soil I use a 1/2 inch masonary drill bit with 2 or 3 18 inch bit extensions and a CORDLESS drill. The cordless drill lets you add a small amount of water to thehole as you drill. By using a 1/2 inch bit, the 5/8 inch ground rods are still in tight contact with the sides of the hole, as you drive them in. Remember to space the ground rods apart a distance equal to their length. An 8 foot rod will need 8 foot from each ground rod AND the center rod. Personally, I use bare, tinned #8 or larger wire and complete the ring around the furthest ground rods buried below the frost line. I have done this for many years, including a solar site I built near Bloomfield, NM. I went to check it after a bad storm, as a precaution. My site had survived ok with just a little brush on the panels. The commerical site next door on commerical power was like an ant bed with all of the techs crawling over each other to fix their equipment. Jeff N5SXQ
[Repeater-Builder] Re: Kenwood TK-690H 29.5-37 MHz, Type 1 radio(s) wanted
James Adkins adkins.ja...@... wrote: Does anyone have or know of someone that would part ways with a Kenwood TK-690H Type 1 low-band commercial rig? Type 1 is the low split, 29.5 to 37 MHz. I would like to purchase 1 or 2 of the units to try on 10-meters. Hi James, Even as a fully Authorized Kenwood Dealer and Service Station I have yet to see the rare low split tk-690h radio. However, you can get a tk-6110 to do both 10 and 6 meters in the same radio. I personally have done the mod a few times, it's not super easy but it can be done. So look for a used tk-6110 radio or in a last act of desperation you can buy a new one from me. :-) I leveled my last one to provide about 45 watts of power from 29.6 to 53.8 MHz in one radio, which I though was pretty impressive. Receiver sensitivity was better than .5 uV across the band. Even if you don't buy a radio from me... I can and would provide you with the information to spread your tk-6110 out. And copies of that information sources were already posted on the web so it's not really rocket science. cheers, skipp skipp025 at yahoo.com
