One thing I always noticed is that its recommended to not exceed 5 watts when operating on AO-7, but I'm not seeing anything about maximum gain to use. I have an Arrow II handheld yagi and on the 440 side supposedly it has a 10dbd gain which would give me effectively 50 watts output assuming no losses. So my question in a nutshell is, what is the maximum recommended radiated power recommended with this bird?
~73, KC2WQW Ron
Hi does the spec specify the output power as EIRP or not?
If EIRP the antenna gain needs to be part of the equation and therefore you need to reduce your transmission power to avoid desense at the receiver on orbit. If the spec does not specify then there should be a receiver senstivity figure already published which would be useful in a link budget equation.
Sent on the road... If urgent call (202) 812-3325
On Jun 10, 2010, at 12:46 PM, Ron Overdrive ronoverdrive@tehfurry.com wrote:
One thing I always noticed is that its recommended to not exceed 5 watts when operating on AO-7, but I'm not seeing anything about maximum gain to use. I have an Arrow II handheld yagi and on the 440 side supposedly it has a 10dbd gain which would give me effectively 50 watts output assuming no losses. So my question in a nutshell is, what is the maximum recommended radiated power recommended with this bird?
~73, KC2WQW Ron _______________________________________________ Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
As far as I can tell looking at AMSAT's website and the AO-7 Log & Resource site I'm not seeing anything mentioning EIRP. Everything says to keep your power low like 5 watts or less. I'm not sure what kind of antenna gain they're assuming when they say that. I pretty much always operate low power as it is and the only indicator they give is if you hear FM noise while in SSB, unfortunately being a new ham I do not know what that sounds like.
On Thu, Jun 10, 2010 at 2:31 PM, Samudra Haque samudra.haque@gmail.comwrote:
Hi does the spec specify the output power as EIRP or not?
If EIRP the antenna gain needs to be part of the equation and therefore you need to reduce your transmission power to avoid desense at the receiver on orbit. If the spec does not specify then there should be a receiver senstivity figure already published which would be useful in a link budget equation.
Sent on the road... If urgent call (202) 812-3325
On Jun 10, 2010, at 12:46 PM, Ron Overdrive ronoverdrive@tehfurry.com wrote:
One thing I always noticed is that its recommended to not exceed 5 watts when operating on AO-7, but I'm not seeing anything about maximum gain to use. I have an Arrow II handheld yagi and on the 440 side supposedly it has a 10dbd gain which would give me effectively 50 watts output assuming no losses. So my question in a nutshell is, what is the maximum recommended radiated power recommended with this bird?
~73, KC2WQW Ron _______________________________________________ Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
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Ron Overdrive -
Samudra Haque