mainehazmt Posted May 13, 2015 Report Posted May 13, 2015 New dilemma. Moved my vertex vx3200 from one side of the garage to my "radio room" about 4 ft away had to re route the coax thru the wall was just layed across the ceiling before Now I have interferiance (constant breaking of squelch) The antenna is fine SWR of 1.2 coax is good and tight all 2 connections and dry. changed radio the same. results. changed antenna the same. unplugged everything no change and it is only on 146.730 no squelch adjustment unless you go in to alignment and I dont have those tools yet or the skills Harmonics somewhere??? everything going thru the repeater is fine transmit reports good...then someone else is transmitting I recieve them fine Im at a lossJohn Quote
PastorGary Posted May 13, 2015 Report Posted May 13, 2015 John - 146.30 MAY be receiving a harmonic from a wireless router... yours or a neighbor. I have a NetGear system in my office and used a scanner in search mode and found MANY hits between 40 and 900 Mhz. I disabled the router and no more 'birdies'. Laptops and tablets operate on the same base frequency, so it could be related to one of those devices as well that might be closer to your coax or radios. Just one possibility for you to investigate. mainehazmt and mellowcream 2 Quote
zap Posted May 14, 2015 Report Posted May 14, 2015 Would it be wise to assume you are using a RX PL? Quote
mainehazmt Posted May 15, 2015 Author Report Posted May 15, 2015 No it is an open repeater. No pl. but!!! Problem solved!! Grounding issue. Installed a Lightning arrestor on the base of the antenna connected it to the ground wire and problem solved. Apparently the arm off the antenna pole for the repeater had rusted or something and the ground was poor for the vhf antenna. Fixed for now. But going to change it all around anyway when I put the tower up. Seem to keep putting off digging the hole for the concrete and mount. Quote
mainehazmt Posted May 15, 2015 Author Report Posted May 15, 2015 You mentioned the router.. Well I ran (hobbled actually) with my portable freq counter. And was surprised at all the emissions around. About 276.xxx - 290.xxx Surprising the rfi emission pollution. But what do you expect with wireless phones remote controls cell phones and anything looking for wifi. Quote
PastorGary Posted May 15, 2015 Report Posted May 15, 2015 A sub harmonic of 146.xxx would fall around 292.xxx Sounds like one possibility out of many. Check baby monitors as well. Some of the low band vhf varieties might have a third harmonic falling in the two meter band. Best of luck... Quote
mainehazmt Posted May 15, 2015 Author Report Posted May 15, 2015 After repairing the ground everything is back to normal! Quote
zap Posted May 15, 2015 Report Posted May 15, 2015 I was gonna suggest, sometimes PL tones close to multiples of 60 Hz (118.8 for example) can bleed AC line noise through. Can't have a coordinated amateur repeater (very few exceptions) in Texas that doesn't have a PL on the receiver so we just run PL's on pretty much everything. Quote
mainehazmt Posted May 15, 2015 Author Report Posted May 15, 2015 The local club has several repeaters around and the main one that is also used for the emergency net is open. No pl just csq Never asked why but I'm new to the group but after getting with them I knew many of them previously Secret society of hams I guess lol Quote
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