Search found 13 matches
- Tue Jun 20, 2006 7:27 pm
- Forum: General Discussion
- Topic: Ramsey remote repeater kit mod
- Replies: 13
- Views: 6562
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...
- Thu Jun 08, 2006 3:15 pm
- Forum: General Discussion
- Topic: Ramsey remote repeater kit mod
- Replies: 13
- Views: 6562
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...
- Thu Mar 16, 2006 6:06 am
- Forum: General Discussion
- Topic: Ramsey remote repeater kit mod
- Replies: 13
- Views: 6562
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.
- Wed Mar 15, 2006 8:33 am
- Forum: General Discussion
- Topic: Ramsey remote repeater kit mod
- Replies: 13
- Views: 6562
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.
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.
- Mon Mar 13, 2006 9:18 am
- Forum: General Discussion
- Topic: Digital clock from 7490's.
- Replies: 13
- Views: 4821
Re: Digital clock from 7490's.
philiba,
Which 2$ PIC are you referring to?
Which 2$ PIC are you referring to?
- Mon Feb 27, 2006 12:18 am
- Forum: General Discussion
- Topic: Digital clock from 7490's.
- Replies: 13
- Views: 4821
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...
- Fri Feb 17, 2006 3:45 pm
- Forum: General Discussion
- Topic: Convert 120 VAC to 5 pulsating DC.
- Replies: 14
- Views: 5993
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>
- Thu Feb 16, 2006 11:12 pm
- Forum: General Discussion
- Topic: Convert 120 VAC to 5 pulsating DC.
- Replies: 14
- Views: 5993
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...
- Thu Feb 16, 2006 8:32 pm
- Forum: General Discussion
- Topic: Convert 120 VAC to 5 pulsating DC.
- Replies: 14
- Views: 5993
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...
- Tue Jan 03, 2006 4:08 am
- Forum: General Discussion
- Topic: Ramsey remote repeater kit mod
- Replies: 13
- Views: 6562
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 ...
- Sun Jan 01, 2006 4:05 am
- Forum: General Discussion
- Topic: Ramsey remote repeater kit mod
- Replies: 13
- Views: 6562
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?
- Thu Dec 29, 2005 3:23 pm
- Forum: General Discussion
- Topic: Ramsey remote repeater kit mod
- Replies: 13
- Views: 6562
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...
- Fri Dec 09, 2005 8:46 am
- Forum: General Discussion
- Topic: Ramsey remote repeater kit mod
- Replies: 13
- Views: 6562
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...