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  1. P

    7/8th wave ..or not

    I own Megawatt 4000 and it works fine with tuned coil. With original coil swr readings was not good anywhere. Measured with antenna analyzer. Same issue with 5000.
  2. P

    23 ch 02a channel mod

    PLL02A chould .do. 512ch but hardware limits most cases.
  3. P

    Yaesu FT-757GX II question

    14v 40mA will last forever
  4. P

    Sirio Vector 4000 SWR issue

    Can you tell gamma match lenght?. Is it near to bottom when you get that result?. Maybe you have to shorten top section to get lower swr on 27.405. 1:1.0 can be archived fine tuning. I have tuned with antenna analyzer.
  5. P

    Zodiac M144 and Zodiac Digi24FM schematics wanted.

    Both are broken. Audio ic missing from M144. I Havent found schematics anywhere.
  6. P

    Sirio Vector 4000 SWR issue

    Have you drilled water hole to gamma tube?.
  7. P

    Short Review - Anysecu / Quansheng UV-K5

    AM rx at weak signals is good but there seem to be issue with agc. High AM rx signal level sound is badly distorted.
  8. P

    Short Review - Anysecu / Quansheng UV-K5

    Just finished my tx measurement and warning!. Do not tx under 136MHz without hw modification. 50MHz tx 2nd harmonic 100MHz is stronger then 50MHz signal!. 70MHz tx 2nd harmonic is equal to tx freq !
  9. P

    Short Review - Anysecu / Quansheng UV-K5

    WFM rx is prety good. I can receive radio stations from Kalix Sweden about. 160km away from my qth with Nagoya NA-775 antenna Also air band works better with NA-775. AM audio cracs some times when signal level chances , but that is not a big broblem.
  10. P

    Short Review - Anysecu / Quansheng UV-K5

    I just measured sensitivity. 18MHz 4.7uV 27.205MHz 1.0uV 50MHz 0.38uV 60MHz 0.23uV 71MHz 0.16uV 80MHz 0.19uV 100MHz 0.2uV 200MHz 0.2uV 300MHz 0.15uV 400MHz 0.18uV 500MHz 0.3uV 600MHz 0.5uV 800MHz 1.9uV 900MHz 12uV
  11. P

    Short Review - Anysecu / Quansheng UV-K5

    Received 1 today. Original antenna in poor. I first tested firmware mod from https://whosmatt.github.io/uvmod/ But no tx lower then 136MHz. Then https://github.com/Tunas1337/UV-K5-Modded-Firmwares Opeded tx . Now i have to do some hardware modifications.
  12. P

    Replacment mosfets RM Italy KL-503

    I found that info from KL203 mosfet, bad cover lasering . Just a look microscope and read original markings.
  13. P

    Short Review - Anysecu / Quansheng UV-K5

    I ordered from AliExpress for 24€. I have to wait 1 month..
  14. P

    Short Review - Anysecu / Quansheng UV-K5

    Hi. Great mod. Is it usable in 4m band if tx need a bit tweaking?
  15. P

    Replacment mosfets RM Italy KL-503

    IRLZ14 is correct one replace RM3.
  16. P

    RM Italy KL 703 Tech Special - Hopefully Minor Problem

    Ohh.. well.. new is so cheap there. Europe prices are much higher 500-650€.
  17. P

    RM Italy KL 703 Tech Special - Hopefully Minor Problem

    RM703 is 16 fet amp. I think there is some fet burnt. You can test fets with multimeter. If you chance all fets dont use IRF520 IRLZ14 is the right fet.
  18. P

    antenna analyzers

    Old topic but must reply. I Have owned several different antenna analyzers. First was MFJ 259 and 269. Then Comet Caa-500 and i liked a lot. Comet was better then MFJ. But then i started to build 4G yagis and need high freq. I bought AAI N1201SA 34-2700MHz and AAI N2021BA 1-200MHz vector antenna...
  19. P

    Abbree Tacticool 42.5" Flexible Tape Dual-Band HT Antenna SMA Male

    Hi. I have one 124cm long Abbree. It should be VHF and UHF but not work well with PMR446. So i tested it with vector antenna analyzer and result was a surprice. Best swr can be found 140, 200, 300, 420 and 460MHz. Maybe have to cut a bit. I hope this information hepls someone.
  20. P

    Antenna and Tower Assembly Help

    My opinion about install height is 11m band vertical quad it have to be about 30m hi on the ground. Then beam cant see near trees or buildings etc. If you havent tested you cant know. I have build and tested quads over 25 years.