Topic: Radio Issues

Been having an issue. We have a NERDIE NASCAR harness in our car which seems to work fine with us and our NERDIE helmet rigs with molded ear plug speakers.

It seems like however, any A&D we get has an IMSA Helmet setup and use a NASCAR adapter, one with earplugs one with helmet drivers. and they can always only barely hear us and we can barely hear them. We're running a Terra on FRS/GMRS to Talkabouts and an iCom scanner and it's no diffrent. quiet mumblemumblemumble ear right up against the radio then *SCRAUNCH!!!!* at a million dB when the carrier drops before the squelch.

Is there a known impedance incompatibility between NASCAR and IMSA? Anyone else have a problem like this?

Mistake By The Lake Racing (MBTL) https://www.facebook.com/groups/MBTLracing/
88 Thunderbird "What's the word? Thunderbird!", "What's the Price? Thirty Twice!"
A&D: 2014 Sebrings at Sebring (NSF), 2014 NJMP2 Jurassic Park (SpeedyCop), 2012 Summit Point J30 (PiNuts)

Re: Radio Issues

I wish I could provide you with my source, but I very recently read an article by a distributor of radio components, and their strong suggestion was to always install IMSA in the car and to use adapters for people with NASCAR helmets because they have run into unsolvable issues running adapters the other way.

Electric Mayhem Racing

Re: Radio Issues

My understanding is that an IMSA radio rig will adapt to a NASCAR helmet but your can't go from NASCAR rig to IMSA helmet.  Which is probably why the above advise to install IMSA in the car and adapt as needed.  I believe that IMSA stuff costs a fair bit more which is why NASCAR ends up being used by most of us.  But if you have 45 minutes to kill, you can ask Troy directly.

1990 RX7 "Mazdarita" 
1994 Jaguar XJ12 (Winner C-Class 2013 Sears Pointless)
1964 Sunbeam Imp (IOE 2013 Sears Pointless)
1980 Rover SD1 (I Got Screwed 2014 Return of Lemonites) (Sold -> Houston.  Gone and forgotten)

Re: Radio Issues

Why should the OP have to adapt his stuff to the needs of an A&D?  I think more people run the NASCAR vs. IMSA so it's kind of like Blu-Ray vs. DVD-HD.  Get on board with the masses.

FWIW, we also use Troy's stuff with the NASCAR setup and have had an A&D with an IMSA helmet, but his adapter worked just fine.

Captain
Team Super Westerfield Bros.
#411
'93 Acura Integra

Re: Radio Issues

VKZ24 wrote:

Why should the OP have to adapt his stuff to the needs of an A&D?  I think more people run the NASCAR vs. IMSA so it's kind of like Blu-Ray vs. DVD-HD.  Get on board with the masses.

FWIW, we also use Troy's stuff with the NASCAR setup and have had an A&D with an IMSA helmet, but his adapter worked just fine.

My helmet is setup for IMSA.  I did an A&D at Sonoma with a team that used the NASCAR spec.  I bought an IMSA -> NASCAR adapter in the pro shop and had no problems other than the $40 I paid for a $5 cable.

By the way, I've also discovered that the IMSA plug can be wired two different ways.  The off-road guys switch the speaker and mic wires on the plug.  Not sure why, but, like, the more you know.

10x loser (Arse-Freeze '11 - Vodden '15) 1x WINNER! Arse-Freeze '14 in the Watermelon Volvo Wagon
Swedish Knievel Skycycle('90 Volvo 740 Wagon)

Re: Radio Issues

VKZ24 wrote:

Why should the OP have to adapt his stuff to the needs of an A&D?  I think more people run the NASCAR vs. IMSA so it's kind of like Blu-Ray vs. DVD-HD.  Get on board with the masses.

FWIW, we also use Troy's stuff with the NASCAR setup and have had an A&D with an IMSA helmet, but his adapter worked just fine.

This is the further weird thing. Some adapters do work better than others from what I've heard. What's going on?I know the good adapters don't have like an impedance matching circuit in them or anything. Are some not wired right?

Mistake By The Lake Racing (MBTL) https://www.facebook.com/groups/MBTLracing/
88 Thunderbird "What's the word? Thunderbird!", "What's the Price? Thirty Twice!"
A&D: 2014 Sebrings at Sebring (NSF), 2014 NJMP2 Jurassic Park (SpeedyCop), 2012 Summit Point J30 (PiNuts)

Re: Radio Issues

gump wrote:
VKZ24 wrote:

Why should the OP have to adapt his stuff to the needs of an A&D?  I think more people run the NASCAR vs. IMSA so it's kind of like Blu-Ray vs. DVD-HD.  Get on board with the masses.

FWIW, we also use Troy's stuff with the NASCAR setup and have had an A&D with an IMSA helmet, but his adapter worked just fine.

My helmet is setup for IMSA.  I did an A&D at Sonoma with a team that used the NASCAR spec.  I bought an IMSA -> NASCAR adapter in the pro shop and had no problems other than the $40 I paid for a $5 cable.

By the way, I've also discovered that the IMSA plug can be wired two different ways.  The off-road guys switch the speaker and mic wires on the plug.  Not sure why, but, like, the more you know.

Oh for chri-sakes. Don't tell me the speakers were acting as a crappy mic and the mic was acting as a crappy speaker.

We may have to wire up our own bulletproof adapter for the imsa guys and their fancy HiFi separate Speaker ground.

Mistake By The Lake Racing (MBTL) https://www.facebook.com/groups/MBTLracing/
88 Thunderbird "What's the word? Thunderbird!", "What's the Price? Thirty Twice!"
A&D: 2014 Sebrings at Sebring (NSF), 2014 NJMP2 Jurassic Park (SpeedyCop), 2012 Summit Point J30 (PiNuts)

Re: Radio Issues

Guildenstern wrote:

Oh for chri-sakes. Don't tell me the speakers were acting as a crappy mic and the mic was acting as a crappy speaker.

We may have to wire up our own bulletproof adapter for the imsa guys and their fancy HiFi separate Speaker ground.

Maybe Troy needs to start building IMSA adapters!?  I've never a problem with Troy's stuff, and I'd buy his over anyone else's overpriced junk.

Captain
Team Super Westerfield Bros.
#411
'93 Acura Integra

Re: Radio Issues

http://trackpedia.winhpde.com/mediawiki/images/thumb/e/e1/Molded-Jacks-Explained.jpg/400px-Molded-Jacks-Explained.jpg

10x loser (Arse-Freeze '11 - Vodden '15) 1x WINNER! Arse-Freeze '14 in the Watermelon Volvo Wagon
Swedish Knievel Skycycle('90 Volvo 740 Wagon)