Re: Nady 101 VHF
rafik,
I rarely check this forum, but when I did, I was unable to locate the unit until now. Do you still need help with the unit? Have you gotten anywhere with it?
Talk about sorry for the late response!
Rick
upicman
Member
Last Activity: 04-13-2023, 06:17 PM
Joined: 10-24-2014
Location: Hempstead, New York
-
Re: Nady 101 VHF
rafik,
Sorry, I never got any schematics for the unit. You will have to try to sleuth out the problem yourself. What are the failure symptoms?
RickLeave a comment:
-
Re: Nady 101 VHF
I measured the receiver's crystal oscillator frequency at 51.130MHz. That, times three, plus the IF gets me to about 170.233MHz, which happens to be what the transmitter was measured at. The 170.225MHz stamped on the cases was just to indicate what the system 'channel' ran at, so a couple of them could be used in the same group of performers with slightly different non-conflicting frequencies.
51.130MHz sounds more reasonable. At least I know what to look for if this one decides to go south again. I suspect the receiver was dropped and caused the...Last edited by upicman; 10-28-2014, 06:27 PM.Leave a comment:
-
Re: Nady 101 VHF
Where would I get one? Sounds like an expensive special order.Leave a comment:
-
Re: Nady 101 VHF
Okay, I've found the problem, but I don't know how to fix it easily. The crystal is shorted. Does anyone have any suggestions as to how to clear a short from a crystal? It's a 170.225 MHz in an HC-49UX case.
**** Update during the writing of this:**********
I went to get an accurate resistance reading of the crystal and noticed that it was rising from 74 ohms to about 80 ohms as I was holding it. I put clip leads on and proceeded to heat it with a lighter. After a couple of short applications of direct flame on the case, the short...Last edited by upicman; 10-26-2014, 07:48 PM.Leave a comment:
-
Re: Nady 101 VHF
I don't know how it would go with the guitar amp decor
...but it could provide some interesting distortion!!...Last edited by upicman; 10-25-2014, 07:56 PM.Leave a comment:
-
Re: Nady 101 VHF
It won't let me transmit in that band. TV. But if the guitar transmitter is known to work (which it is now), I can start poking around the receiver as soon as I get a chance.
I'm feeling better about this now. Thanks again.Leave a comment:
-
Re: Nady 101 VHF
Boy do I feel silly. With all the stuff I have, I didn't think of using the handy-talky to troubleshoot. Thanks for the lesson!
RickLeave a comment:
-
Re: Nady 101 VHF
Okay, I guess I didn't have the signal generator output high enough. My VX-7R can hear the transmitter. The guitar comes through. I guess I need to concentrate my efforts on the receiver. That'll mean the scope. I won't be able to get to that tonight.
You have moved me along. Thanks for the guidance so far. I'll get this thing working sooner or later.
RickLeave a comment:
-
Re: Nady 101 VHF
Crystals read 170.225. I actually have a spectrum analyzer. It shows carrier, but I don't see modulation with 1 khz input, so I can't really tell if it's AM or FM.
The manual I snagged was for operation of a similar device, but with no schematics or alignment prcedures. The LED on the transmitter is only to indicate power. It flashes when I turn the slide switch on. If I put a weak battery in, it comes on and stays on, indicating battery replacement is required. (According to the manual)
I'll have to drag out the scope and start tracing...Leave a comment:
-
Re: Nady 101 VHF
Yes.Leave a comment:
-
Re: Nady 101 VHF
I have verified continuity from ring and tip to the respective points on the circuit board. I am not sure what you are looking for with regards to pictures, so I quickly snapped a couple. If you have a more specific area, please let me know.
Thank you for your quick response....Leave a comment:
-
Nady 101 VHF
I just picked up a Nady 101 VHF at a local flea market. The transmitter seems to be outputting RF as indicated on the spectrum analyzer. The TX led on the receiver never illuminates. I was hoping someone might have a schematic. The crystals are the same frequency in both ends, but I get no audio out when the guitar is plugged in.
Suggestions for alignment? Schematics?
Thanks,
Rick -
Re: New Members - please post your introductions here
Hi. I have been involved in Electronics for over thirty years, since I was a Mercedes mechanic. I have worked at Sperry and other major corporations and enjoy electronics and microcontrollers (hence the upic moniker) as a hobby as well. I just snagged two broken VIZ supplies and a Nady wireless guitar system. Hopefully I can get help with the Nady, as the VIZ stuff is almost fixed already (thanks to this site).
Thanks for a great resource!
RickLeave a comment:
No activity results to display
Leave a comment: