|
Antenna to cover AM broadcast to 999 mhz?
What would be the best combination to cover that frequency range in
receive only? Would a 100 feet dipole with a discone cover it? Any other suggestions? Thanks. Mike. |
Antenna to cover AM broadcast to 999 mhz?
On 22 Feb 2007 20:15:22 -0800, "ve2cjw" wrote:
What would be the best combination to cover that frequency range in receive only? A different antenna every octave: 11 antennas. Would a 100 feet dipole with a discone cover it? No. Any other suggestions? See above. You could reasonably expect to skip the first 4 antennas to cover the lowest frequencies. 73's Richard Clark, KB7QHC |
Antenna to cover AM broadcast to 999 mhz?
ve2cjw wrote:
What would be the best combination to cover that frequency range in receive only? Would a 100 feet dipole with a discone cover it? Any other suggestions? Thanks. Mike. Kind of like asking what is the best combination of qualities in a pet. Depends on what you mean by "cover" and "best". If you mean better than no antenna at all, then the dipole would probably work, although it will be very directional at the higher frequencies, and depending on the impedances involved, its response will not be uniform across your target spectrum. A vhf/uhf discone would be omnidirectional, but you said nothing about the importance of directionality (in either the vertical or horizontal planes) or of gain. You have not mentioned whether any devices might be inserted between the antenna and the receiver to effect a reasonable impedance match. Inexpensive scanners often use a single (active) antenna to cover that kind of range. In which parameters do you seek to improve on simple scanner antennas? Sensitivity? Bandwidth? Directionality? Local noise rejection? Chuck NT3G ----== Posted via Newsfeeds.Com - Unlimited-Unrestricted-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- |
Antenna to cover AM broadcast to 999 mhz?
The idea is that I want to receive AM and shortwave broadcasts
probably using one antenna. Then, I need to be able to receive 144 mhz and 440mhz in any direction including straight up for satellites, I am talking about FM here plus the aviation band in AM. I also want to receive some frequencies around 800mhz also omnidirectional. I will be using all of these receive frequencies with an Icom IC-91A. I will transmit on 144 and 440mhz FM using a Kenwood TM-G707A and a suitable antenna depending if I want to access a repeater or a satellite. For that, I have a dual band coaxial type of antenna and I will build myself a couple of turnstile types for the FM satellites. I just wanted to minimize the number of antennas I really need. 73 de VE2CJW Mike. |
Antenna to cover AM broadcast to 999 mhz?
ve2cjw wrote:
The idea is that I want to receive AM and shortwave broadcasts probably using one antenna. Then, I need to be able to receive 144 mhz and 440mhz in any direction including straight up for satellites, I am talking about FM here plus the aviation band in AM. I also want to receive some frequencies around 800mhz also omnidirectional. I will be using all of these receive frequencies with an Icom IC-91A. I will transmit on 144 and 440mhz FM using a Kenwood TM-G707A and a suitable antenna depending if I want to access a repeater or a satellite. For that, I have a dual band coaxial type of antenna and I will build myself a couple of turnstile types for the FM satellites. I just wanted to minimize the number of antennas I really need. 73 de VE2CJW Mike. Thanks for the additional information, Mike. For receiving MW and HF broadcast stations, a random length of wire often suffices because these stations tend to employ high power and directional antennas. You might find that by making all or a portion of the antenna vertical, your reception of distant stations is improved. An inverted L antenna is favored by many SWLs. A google search on "SWL antenna" will provide you with a lot of useful information on what others have used successfully. I think a "tuner" or impedance matching circuit will be a useful addition, especially now, at the bottom of the sunspot cycle. For vhf/uhf omnidirectional reception, your suggestion of a discone should work well, keeping in mind that it may not be suitable for satellite reception in its usual orientation. 73, Chuck NT3G ----== Posted via Newsfeeds.Com - Unlimited-Unrestricted-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- |
Antenna to cover AM broadcast to 999 mhz?
"ve2cjw" wrote in message ups.com... What would be the best combination to cover that frequency range in receive only? Would a 100 feet dipole with a discone cover it? Any other suggestions? Thanks. Mike. A 100 foot dipole will work great on the broadcast band, and for receiving, will be usable up to around 30 MHz. You will need at least 1 other antenna. A 20 - 1000 MHz discone won't work very well, compared to a beam cut for a particular frequency, but is probably the simplest way to go. Tam |
| All times are GMT +1. The time now is 12:41 AM. |
Powered by vBulletin® Copyright ©2000 - 2025, Jelsoft Enterprises Ltd.
RadioBanter.com