I purchased the TX-66 transmitter, which is the more expensive unit with a
SAW resonator, hoping for better stability than the standard LC module. The
receiver is the RX-66 super-regen. Performance and workmanship was very
poor. Even at 10' range, the received signal dropped out as surrounding
objects moved around. The low logic level from the receiver was ~1 volt,
the high level was OK. I used the recommended 9" antenna on both units, and
tuning the receiver as recommended did no good. I tried to phone Ming
several times, but there was no answer. If I recall correctly, they didn't
reply to email either.
Several others on this list had no problems, but I believe they used the
cheaper LC transmitter. I gave up and bought a set from Ramsey. They cost
more, but the tx uses a SAW filter, and the rx is superhet. The received
signal is solid at 100'. My only complaint is that the rx is supposed to
work at 5 volts, but it is marginal; does quite well at =>6 volts.
Ray McArthur
Original Message
From: <jim.cairns@m...>
To: <basicstamps@egroups.com>
Sent: Monday, May 08, 2000 3:41 PM
Subject: [noparse][[/noparse]basicstamps] Ming RF Modules
> Has anyone used these modulels for serial comunications?
I have experimented with using the Ming RF modules
in serial applications, but they tend to be unstable
with varying environmental conditions such as temperature
changes, rain, and traffic in the immediate area.
If you're looking for [noparse][[/noparse]solid] RF components for serial applications
the Linx Technologies LC RF modules are exceptional.
The Ming RF modules work very well for applications that
use the Holtek encoder/decoder ICs, but they don't perform
[noparse][[/noparse]reliably] for serial applications.
Original Message
From: <jim.cairns@m...>
To: <basicstamps@egroups.com>
Sent: Monday, May 08, 2000 1:41 PM
Subject: [noparse][[/noparse]basicstamps] Ming RF Modules
> Has anyone used these modulels for serial comunications?
>
>
>
>
>
Archiver
Posts: 46,084
Comments
jim.cairns@m... wrote:
>
> Has anyone used these modulels for serial comunications?
SAW resonator, hoping for better stability than the standard LC module. The
receiver is the RX-66 super-regen. Performance and workmanship was very
poor. Even at 10' range, the received signal dropped out as surrounding
objects moved around. The low logic level from the receiver was ~1 volt,
the high level was OK. I used the recommended 9" antenna on both units, and
tuning the receiver as recommended did no good. I tried to phone Ming
several times, but there was no answer. If I recall correctly, they didn't
reply to email either.
Several others on this list had no problems, but I believe they used the
cheaper LC transmitter. I gave up and bought a set from Ramsey. They cost
more, but the tx uses a SAW filter, and the rx is superhet. The received
signal is solid at 100'. My only complaint is that the rx is supposed to
work at 5 volts, but it is marginal; does quite well at =>6 volts.
Ray McArthur
Original Message
From: <jim.cairns@m...>
To: <basicstamps@egroups.com>
Sent: Monday, May 08, 2000 3:41 PM
Subject: [noparse][[/noparse]basicstamps] Ming RF Modules
> Has anyone used these modulels for serial comunications?
in serial applications, but they tend to be unstable
with varying environmental conditions such as temperature
changes, rain, and traffic in the immediate area.
If you're looking for [noparse][[/noparse]solid] RF components for serial applications
the Linx Technologies LC RF modules are exceptional.
The Ming RF modules work very well for applications that
use the Holtek encoder/decoder ICs, but they don't perform
[noparse][[/noparse]reliably] for serial applications.
Regards,
-Bruce
http://www.rentron.com
Original Message
From: <jim.cairns@m...>
To: <basicstamps@egroups.com>
Sent: Monday, May 08, 2000 1:41 PM
Subject: [noparse][[/noparse]basicstamps] Ming RF Modules
> Has anyone used these modulels for serial comunications?
>
>
>
>
>