FM interferance from a Peavey Nashville 1000

John McConnell · Post by **John McConnell** » 17 Jul 2010 6:23 am

The other night we were playing at the local Moose Lodge and my Nashville 1000 was causing all kinds of problems with the house wireless mike device. I also have a lot of trouble with my FM reception at home as soon as I turn on my amp. Anyone know what is going on and if there is a solution?

John McConnell
Yuba City, CA
ShoBud Professional, Peavey Nashville 100
B-Bender Tele, Fender Twin Reverb

Bob Vantine · Post by **Bob Vantine** » 18 Jul 2010 3:15 pm

John....
I had the same thing happen with my NV112 about 2 months ago . I live on same property I grew up on and hadn't had this much interference since mid 70s with an old Ampeg Gemini II & Ampeg EB-2 stereo amps .

Would like ideas also .thanks !

****Bob V****

Larry Robinson · Post by **Larry Robinson** » 18 Jul 2010 5:36 pm

I would suspect RFI from the switching power supply in the amp. I don't have any suggestions except maybe contact Peavey.

Jack Stoner · Post by **Jack Stoner** » 19 Jul 2010 2:27 am

That is a common problem with the Nashville 1000's and VHF wireless systems. Nothing you can do about it except switch to a UHF wireless system or not use the 1000 in places that have a VHF system. Actually, the old VHF systems are prone to interference from TV signals as the FCC has opened more frequencies in the VHF range for other uses with the new "digital" TV transmission. (Something music stores won't tell you so they can sell you the outdated VHF wireless systems).

Apparently it's the "digital" power amp section that is causing this and not the power supply as it's a conventional power supply, not a switching power supply as originally was thought when the 1000 first came out.

Lynn Oliver · Post by **Lynn Oliver** » 19 Jul 2010 11:00 am

If this is a VHF problem this does not apply: Operation of Wireless Mics in 700 MHz Band

Jack Stoner · Post by **Jack Stoner** » 19 Jul 2010 11:32 am

I wasn't sure on the exact frequency range, but some of the older VHF wireless systems do work in the TV frequency range.

However, it is a proven problem with the Nashville 1000 and VHF wireless systems, either mic or the wireless instrument(guitar/bass)systems. I've proved it on two different VHF Samson wireless mic systems - with 3 different Nashville 1000's (with different production times). There have been reports on this forum of the interference problem in other brands of VHF wireless mic and instrument systems.

Clete Ritta · Post by **Clete Ritta** » 20 Jul 2010 3:32 am

This is a good topic!

I've recently started using my old Samson wireless for guitar and loaned a bandmate a Shure rackmount wireless for accordion though he hasn't used it yet. I use the Samson wireless into my NV 1000 and it works well overall.

There are usually only a few hot spots where interference is encountered, but usually far from the receiver out in the room, and I just avoid going there. Nice thing is being able to hear the whole band thru the PA while playing during soundchecks.

Jack Stoner wrote:...it is a proven problem with the Nashville 1000 and VHF wireless systems, either mic or the wireless instrument(guitar/bass)systems...

Jack,
I'd like more info about the NV issue.

I'll look into getting updates, so I can be legally wireless

Clete

Jack Stoner · Post by **Jack Stoner** » 20 Jul 2010 4:20 am

The issue of interference from a Nashville 1000 came up when the amp first came out. There were seveal posts on the forum about problems both with wireless mic systems and with wireless instrument systems.

I didn't have a NV1000 at the time and borrowed one from a local steeler to try out where I was picking, that had a Samson VHF wireless mic system. As soon as the NV1000 was powered on there was interference in the wireless mic system, power off the amp and the interference went away. I borrowed a different (and later production model) NV1000 from another local steeler and tried it and the exact same problem. We tried several things with the wireless system and at one point thought the problem was because both the wireless base unit and the amp were both in close proximity on the stage. We remoted the antenna and that didn't help, we then moved the wireless base unit off of the stage and it still didn't help.

In the interim the wireless system went out and then I got my own NV1000 and because the wireless was down it wasn't a problem. The club owner got a new wireless system and it turned out to be another, newer model Samson "multi-frequency" VHF wireless system and the same interference problems no matter which frequency in the unit was used. He returned it and got a UHF model and no more problems.

Forum member Blake Hawkins, who is an EE and retired TV Broadcast Engineer, and I worked on the problem at the place I was picking (same place we have our Florida Steel Guitar Club jams). We didn't have an RF Field Strength Meter so we have never tried taking Field Strength readings on the Nashville 1000. The actual radiation may be (and probably is) within FCC maximum radiation spec's.

Clete Ritta · Post by **Clete Ritta** » 27 Jul 2010 1:45 am

Looks like theres only 4 days left to send a claim.
Shure had this on their site:

700 band rebate has ended
December 01, 2008 - June 30, 2010

July 1, 2010 Update: The purchasing period for this rebate has ended. Rebate claims must be postmarked no later than July 31, 2010, and received by Shure no later than August 14, 2010. Rebate recipients, please allow at least 6–8 weeks for processing. Please contact (800) 25-SHURE (800-257-4873) with any questions.

I feel like Nigel Tufnel

Clete