Search found 13 matches

by m2mike
Tue Jun 20, 2006 7:27 pm
Forum: General Discussion
Topic: Ramsey remote repeater kit mod
Replies: 13
Views: 3808

Okay, suppose it was modded to 418 Mhz. That means the recieving crystal at X20 on the RRW1B would have to be 3.1990 MHz. Suppose I wanted to get the part from www.vectron.com. What would be the appropriate part number? Also, it seems like the resistance goes up when the frequency changes. Perhaps a...
by m2mike
Thu Jun 08, 2006 3:15 pm
Forum: General Discussion
Topic: Ramsey remote repeater kit mod
Replies: 13
Views: 3808

I have successfully modded a RRW1A transmitter to use a different frequency. This was as simple as using a different SAW resonator in place of the one provided, but I seem to be having trouble with the RRW1B receiver. I changed the crystal oscillator at X20 to a different frequency so as to change t...
by m2mike
Thu Mar 16, 2006 6:06 am
Forum: General Discussion
Topic: Ramsey remote repeater kit mod
Replies: 13
Views: 3808

Re: Ramsey remote repeater kit mod

I no longer require a 1 to 2 Khz bandpass, but thanks for the links for the crystal. I just need the transmit and recieve frequency, which is almost done now. Thank you.
by m2mike
Wed Mar 15, 2006 8:33 am
Forum: General Discussion
Topic: Ramsey remote repeater kit mod
Replies: 13
Views: 3808

Re: Ramsey remote repeater kit mod

315.00 Mhz……………2.410700…..Mhz…Local osc Xtal freq
418.00 Mhz……………3.199000
433.92 Mhz……………3.320800

Can someone recommend a supplier for the above crystals and other crystals as well? I have already perused Jameco and Digikey and didn't find anything.
by m2mike
Mon Mar 13, 2006 9:18 am
Forum: General Discussion
Topic: Digital clock from 7490's.
Replies: 13
Views: 2536

Re: Digital clock from 7490's.

philiba,

Which 2$ PIC are you referring to?
by m2mike
Mon Feb 27, 2006 12:18 am
Forum: General Discussion
Topic: Digital clock from 7490's.
Replies: 13
Views: 2536

Digital clock from 7490's.

Hello, I would like to construct a digital clock from cascading 7490 chips. What is the best way to implement the hours section? So far, I have seen this. http://members.aol.com/_ht_a/HAdelkopf/dclock.html What about getting hours and then dividing by twelve with a 7492? I would then need the follow...
by m2mike
Fri Feb 17, 2006 3:45 pm
Forum: General Discussion
Topic: Convert 120 VAC to 5 pulsating DC.
Replies: 14
Views: 2854

Re: Convert 120 VAC to 5 pulsating DC.

The idea here is to create a DC 5V 50% duty cycle at 60 Hz. I should have mentioned that as well. Is it wiser to just convert to 5 Volts DC and then use a 555 timer? I think I can figure it out. Thank you very much.

<small>[ February 17, 2006, 04:13 PM: Message edited by: m2mike ]</small>
by m2mike
Thu Feb 16, 2006 11:12 pm
Forum: General Discussion
Topic: Convert 120 VAC to 5 pulsating DC.
Replies: 14
Views: 2854

Re: Convert 120 VAC to 5 pulsating DC.

Thank you. I should have specified if I was trying to get half wave rectification or full wave rectification. By the time I re-checked my first post, you guys had already answered. Thank you for filling in the blanks. I would like to convert from 120 Volts AC at 60 Hz to 5 Volts DC at 60 Hz. So I kn...
by m2mike
Thu Feb 16, 2006 8:32 pm
Forum: General Discussion
Topic: Convert 120 VAC to 5 pulsating DC.
Replies: 14
Views: 2854

Convert 120 VAC to 5 pulsating DC.

What would I need to convert 120 Volts AC to 5 Volts of pulsating DC? Wouldn't I just need a transformer to convert to 5 volts or close to it? Wouldn't I then need a rectifier? I don't want to filter it as I want the pulses to be easily detectable. If someone can suggest an implementation, I would b...
by m2mike
Tue Jan 03, 2006 4:08 am
Forum: General Discussion
Topic: Ramsey remote repeater kit mod
Replies: 13
Views: 3808

Re: Ramsey remote repeater kit mod

Yes, I have no doubt the packages do their intended job, but none of them receive on the frequency in KHz that I need. I really just want to be able to band pass the IR at any modulation. It would be nice to go as low as 1 Khz and 2 Khz and as high as 56 Khz. Is this impossible? I don't know of any ...
by m2mike
Sun Jan 01, 2006 4:05 am
Forum: General Discussion
Topic: Ramsey remote repeater kit mod
Replies: 13
Views: 3808

Re: Ramsey remote repeater kit mod

Aren't all of these modules using a bandpass filter to only pass a particular modulated signal? What if I don't want to limit what signal I pass through it? Forgive my ignorance, but why include a band-pass filter at all with these modules? Is this technically necessary?
by m2mike
Thu Dec 29, 2005 3:23 pm
Forum: General Discussion
Topic: Ramsey remote repeater kit mod
Replies: 13
Views: 3808

Re: Ramsey remote repeater kit mod

Thank you Mr. Whatley. I do have one follow up question though. It seems that the included IR sensor module that comes with this kit is limiting what IR signals I can relay. For example, it doesn't relay 56 Khz signals as far as I can tell. I suspect that this is the fault of the IR sensor module. T...
by m2mike
Fri Dec 09, 2005 8:46 am
Forum: General Discussion
Topic: Ramsey remote repeater kit mod
Replies: 13
Views: 3808

Ramsey remote repeater kit mod

Hello, I have ordered the RRW1AC Wireless IR/RF Remote Transmitter and the RRW1BC Wireless RF/IR Remote Receiver from Ramsey Electronics. I have a question. How would I mod it for a different frequency? On the transmitter, is it as simple as changing the SAW resonator at X1? Will I also need to chan...