Kitztech KT-501 Preamp Tests
I purchased and tested a KT-501. There was a report that Kitztech claimed IP3 as +36 dBm. If true that would be a good number for handling of strong signals. Unfortunately I was not able to confirm that number. It appears to me KT-501 is just a lower gain version of the KT-500.
I've attached a series of spectrum analyzer images showing tests results for gain, noise figure and IP3 for VHF and UHF for the KT-501. The images are as follows:
1) VHF Gain
2) UHF Gain
3) VHF NF
4) UHF NF
5) VHF IP3
6) UHF IP3
Here's a summary of the test results for the KT-501 and KT-500. All tests are done with gain set to maximum.
KT-501 / KT-500
VHF Gain - 16 dB / 35.5 dB
UHF Gain - 16.8 dB / 33.5 dB
VHF NF - 1.8 dB / 1.3 dB
UHF NF - 1.9 dB / 1.3 dB
VHF IP3 - +26.2 dBm / +21.6 dBm
UHF IP3 - +26.3 dBm / +21.3 dBm
Those numbers for UHF IP3 on both preamps are some of the lowest I've measured. I can't recommend either of these preamps. The KT-200 is a much better preamp. I measured its IP3 at +30 dBm and the NF is a bit lower.
The best commercial preamp I've measured for IP3 is a 30 dB gain Tinlee MA-25U-77A at +37.5 dBm. The next best is the Clearstream Juice at 35.5 dBm. Both of those numbers are excellent.
The Juice preamp NF is about 1 dB higher than the 500/501 but I think that's a very small price to pay for the much superior strong signal handling. If you have a station that's so weak that 1 dB actually makes any difference then the station won't be anywhere near 100% reception.