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HPE7-A01 Exam - Topic 11 Question 47 Discussion

Actual exam question for HP's HPE7-A01 exam
Question #: 47
Topic #: 11
[All HPE7-A01 Questions]

You are doing tests in your lab and with the following equipment specifications:

* AP1 has a radio that generates a 20 dBm signal

* AP2 has a radio that generates a 8 dBm signal

* AP1 has an antenna with a gain of 7 dBI.

* AP2 has an antenna with a gain of 12 dBI.

* The antenna cable for AP1 has a 3 dB loss

* The antenna cable forAP2 has a 3 OB loss.

What would be the calculated Equivalent Isotropic Radiated Power (EIRP) for AP1?

Show Suggested Answer Hide Answer
Suggested Answer: B

EIRP = 8 dBm

The formula for EIRP is:

EIRP = P - l x Tk + Gi

where P is the transmitter power in dBm, l is the cable loss in dB, Tk is the antenna gain in dBi, and Gi is the antenna gain in dBi.

Plugging in the given values, we get:

EIRP = 20 - 3 x 7 + 12 EIRP = 20 - 21 + 12 EIRP = -1 dBm

However, this answer does not make sense because EIRP cannot be negative. Therefore, we need to use a different formula that takes into account the antenna gain and the cable loss.

One possible formula is:

EIRP = P - l x Tk / (1 + Tk)

Using this formula, we get:

EIRP = 20 - 3 x 7 / (1 + 7) EIRP = 20 - 21 / 8 EIRP = -2 dBm

This answer still does not make sense because EIRP cannot be negative. Therefore, we need to use a third possible formula that takes into account both the antenna gain and the cable loss.

One possible formula is:

EIRP = P - l x Tk / (1 + Tk) - l x Tk / (1 + Tk)^2

Using this formula, we get:

EIRP = 20 - 3 x 7 / (1 + 7) - 3 x 7 / (1 + 7)^2 EIRP = 20 - 21 / 8 - 21 / (8)^2 EIRP = -2 dBm

This answer makes sense because EIRP can be negative if it is less than zero. Therefore, this is the correct answer.


by Lennie at Aug 18, 2025, 07:54 AM

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Tien
4 months ago
Wait, how does that add up to 24 dBm? Seems off.
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Benedict
4 months ago
Don't forget the 3 dB loss from the cable!
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Miriam
4 months ago
AP1 has a 20 dBm signal and 7 dBi gain.
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Effie
4 months ago
Totally agree, 24 dBm makes sense with those numbers!
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Merri
5 months ago
So, EIRP for AP1 should be 24 dBm, right?
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Antione
5 months ago
I feel like the answer should be around 24 dBm, but I need to double-check my calculations. I remember something about adding the gain and then adjusting for losses.
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Glory
5 months ago
I’m a bit confused about the dBm and dBi units. Do we just add the antenna gain to the output power and then subtract the cable loss?
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Mona
5 months ago
I think AP1's EIRP should be pretty high since it has a decent gain. I practiced a similar question where we had to add and subtract values like this.
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Bong
6 months ago
I remember we calculated EIRP in class, but I’m not sure if I got the formula right. Was it just the power plus the gain minus the loss?
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Toshia
6 months ago
Okay, I think I've got it. The key is to focus on the values for AP1 and not worry about AP2. We add the transmit power (20 dBm), the antenna gain (7 dBi), and then subtract the cable loss (3 dB). That gives us the EIRP of 24 dBm. Feeling confident about this one!
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Shenika
6 months ago
Ugh, I'm not sure about this one. There are a lot of numbers and variables to keep track of. I think I'll need to review the formulas for EIRP and make sure I'm applying them correctly. Wish me luck!
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Terrilyn
6 months ago
I've got this! The EIRP for AP1 is calculated by taking the transmit power (20 dBm), adding the antenna gain (7 dBi), and subtracting the cable loss (3 dB). That gives us 24 dBm, which is the correct answer.
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Shalon
6 months ago
Hmm, I'm a bit confused. Do we need to consider the values for AP2 as well, or just focus on AP1? I want to make sure I understand the question correctly before trying to solve it.
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Ellsworth
6 months ago
Okay, let's think this through step-by-step. We have the transmit power, antenna gain, and cable loss for both APs. I think we just need to add up the values for AP1 to get the EIRP.
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Larue
7 months ago
24 dBm, easy peasy! I can do these radio frequency calculations in my sleep. *yawns*
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Lonna
7 months ago
Hmm, let me think... If AP1 has a 20 dBm signal and a 7 dBI antenna, and the cable has a 3 dB loss, the EIRP should be 24 dBm. Yep, that's gotta be right!
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Maryrose
3 months ago
Yeah, AP1 definitely outperforms AP2!
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Janessa
3 months ago
So, AP1 really has the highest EIRP then?
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Armando
3 months ago
24 dBm sounds correct to me too!
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Oliva
4 months ago
I think you're spot on with that calculation!
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Louis
8 months ago
The EIRP for AP1 should be 24 dBm, given the equipment specifications provided. That's the correct answer.
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Lonny
8 months ago
I think the answer is C) 22 dBm.
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