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Convert the LA-1K for 2-30 MHz Operation for MARS / CAP / Gov

n4apg #288 The owner must contact Palstar and submit proof of authority to operate the amp outside the Amateur Radio bands.? Palstar will email you the firmware necessary to open the amp to operate anywhere in the 2 to 30 MHz (It may go higher, i.e. to 6 Meters, but I have not tested it).? The CB Radio channels (26.965 to 27.405 MHz) are specifically excluded from this operation. Updating the firmware is simple, and the instructions are in the manual.? If you present the out-of-band authority at the time of purchase, Palstar will load the correct firmware before shipment to you. In my testing into a 1000 Watt 50 ohm load with a Bird Watt meter my LA-1K yielded from 500 to 900 Watts output across 2 - 30 MHz with 30 Watts input.? My amp is wired for 240 VAC.
James All Messages By This Member #289 Dear Mr. Pfost: ?Your message seems to say that the LA-1K, unlike every other HF power amplifier (used below say 26 MHz), needs permission in order to operate other than on frequencies assigned to the amateur-radio service. ? The available information contains no hint of this unusual restriction. ? Your testing across 2 to 26 MHz must have noted answers to my specific question: ?What is the lower and upper frequency of each of the (probably five) filters? ?The "160 meter" filter probably encompasses 1.8 MHz to something like 3.4 MHz - for instance. ? Thank you for responding - no other person has done so. ?E-mail to Palstar in December was not answered. ? 73, ? James toggle quoted message Show quoted text ------ Original Message ------ From: "Bill Pfost via groups.io" <wpfost@...> To: [email protected] Sent: 4/6/2020 4:34:39 PM Subject: [la1k] Convert the LA-1K for 2-30 MHz Operation for MARS / CAP / Gov The owner must contact Palstar and submit proof of authority to operate the amp outside the Amateur Radio bands.? Palstar will email you the firmware necessary to open the amp to operate anywhere in the 2 to 30 MHz (It may go higher, i.e. to 6 Meters, but I have not tested it).? The CB Radio channels (26.965 to 27.405 MHz) are specifically excluded from this operation. Updating the firmware is simple, and the instructions are in the manual.? If you present the out-of-band authority at the time of purchase, Palstar will load the correct firmware before shipment to you. In my testing into a 1000 Watt 50 ohm load with a Bird Watt meter my LA-1K yielded from 500 to 900 Watts output across 2 - 30 MHz with 30 Watts input.? My amp is wired for 240 VAC.
Bill Pfost #290 James, I suggest you telephone Palstar and ask your questions about the pass bands of the output filters. Into a 50 Ohm load my results are as follows.? I am not trying to maximize power at each level, I am merely looking for at least 500 Watts output for 30 Watts input at frequency. Amp is a Palstar LA-1K with MARS/Gov firmware, serial number 3049X(last digit excluded), purchase date last quarter 2018.? Radio is Flex 6700 with MARS Turf @ relative 30W input tune signal, Bird 43 Watt Meter w/1000H element, 50 Ohm 1000W Bird 8251 Load, Coax is RG 8/U) Freq - Output(Watts) 1.8 - 700 2.0 - 760 3.0 - 860 4.0 - 440 5.1 - 820 6.0 - 800 7.0 - 500 8.0 - 800 9.0 - 700 10.1 - 760 11.0 - 780 12.0 - 720 13.0 - 700 14.0 - 330 15.1 - 680 16.0 - 680 17.0 - 820 18.0 - 820 19.0 - 820 20.1 - 800 21.0 - 760 22.0 - 680 23.0 - 740 24.0 - 680 25.1 - 720 26.0 - 740 (27 MHz excluded) 28.0 - 820 29.0 - 800 30.0 - 760 Hope this helps.? This does not mean a user will get this power out into a non-50 Ohm load.? These results are a near-ideal bench test.? Into a real world antenna you will get different results.
Bill Pfost #291 I contacted Palstar and reported my results and was advised I should not see the power drop off at 4, 7 and 14 MHz.? So I will send my amp back to Palstar for the LA-1K revisions now available and for a check up. I inquired about filters and was told there are five relays and six filters which switch in and out.? Filter switchover frequencies (which should be avoided) are 4.502MHz, 9.002MHz and 22.002MHz.? Filtering is optimized for the Amateur Radio bands, which means additional drive may be needed to yield the same power output outside the ham bands.
James All Messages By This Member #292 Dear Mr. Pfost: ?Interesting indeed. ?Palstar seems to believe that a hardware change is needed to "smooth-out" the gain. ? ?The six filters probably include one for Six Meters. ? Knowing the frequencies to be avoided is a big help. ?A competitor's amplifier has a transition frequency (between filters) that is on a frequency used by both Army and AF (amplifier had difficulty deciding which filter to use - not good). ? It will be of great interest to know your measurements after the amplifier is returned. ?. . . ?and any comments from Palstar about what hardware changes were made. ? You have been helpful and you may end up having an improved amplifier. ?73, ? James toggle quoted message Show quoted text ------ Original Message ------ From: "Bill Pfost via groups.io" <wpfost@...> To: [email protected] Sent: 4/7/2020 3:30:19 PM Subject: Re: [la1k] Convert the LA-1K for 2-30 MHz Operation for MARS / CAP / Gov I contacted Palstar and reported my results and was advised I should not see the power drop off at 4, 7 and 14 MHz.? So I will send my amp back to Palstar for the LA-1K revisions now available and for a check up. I inquired about filters and was told there are five relays and six filters which switch in and out.? Filter switchover frequencies (which should be avoided) are 4.502MHz, 9.002MHz and 22.002MHz.? Filtering is optimized for the Amateur Radio bands, which means additional drive may be needed to yield the same power output outside the ham bands.
[email protected] All Messages By This Member #297 Will the unit do 30 Meters (200W) without the mars mod?
Rich McCabe #298 开云体育 Yes ? toggle quoted message Show quoted text From: [email protected] <[email protected]> On Behalf Of N5GGG@... Sent: Monday, April 6, 2020 9:32 PM To: [email protected] Subject: Re: [la1k] Convert the LA-1K for 2-30 MHz Operation for MARS / CAP / Gov ? Will the unit do 30 Meters (200W) without the mars mod?
Bill Pfost #357 Edited My LA-1K was updated by Palstar to current production improvements.? The improvements were discrete component changes and replacement of three low-pass filters.? The amp was also checked for alignment. In the same manner as the above analysis, I repeated the test with these results.? The $99 cost to update the amp was worthwhile in my view.? Performance was more uniform. Amp is a Palstar LA-1K with MARS/Gov firmware, serial number 3049X(last digit excluded), purchase date last quarter 2018.? Radio is Flex 6700 with MARS Turf @ relative 30W input tune signal, Bird 43 Watt Meter w/1000H element, 50 Ohm 1000W Bird 8251 Load, Coax is RG 8/U) Freq - Output(Watts) 1.8 - 760 2.0 - 740 3.0 - 740 4.0 - 710 5.1 - 770 6.0 - 720 7.0 - 500 8.0 - 760 9.0 - 650 10.1 - 720 11.0 - 720 12.0 - 720 13.0 - 720 14.0 - 720 15.1 - 730 16.0 - 740 17.0 - 780 18.0 - 800 19.0 - 830 20.1 - 820 21.0 - 780 22.0 - 700 23.0 - 660 24.0 - 680 25.1 - 700 26.0 - 710 (27 MHz excluded) 28.0 - 760 29.0 - 760 30.0 - 800

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