Call Search
     

New to Ham Radio?
My Profile

Community
Articles
Forums
News
Reviews
Friends Remembered
Strays
Survey Question

Operating
Contesting
DX Cluster Spots
Propagation

Resources
Calendar
Classifieds
Ham Exams
Ham Links
List Archives
News Articles
Product Reviews
QSL Managers

Site Info
eHam Help (FAQ)
Support the site
The eHam Team
Advertising Info
Vision Statement
About eHam.net

donate to eham
   Home   Help Search  
Pages: [1]   Go Down
  Print  
Author Topic: Low Pass Filter and HF Power Amp  (Read 412 times)
SIMON123
Member

Posts: 122




Ignore
« on: November 29, 2018, 06:15:31 AM »

Wonder if any information or experience on the below low pass filter and power amplifiers?   For 40 meter, LPF is 35 dB attenuation at second harmonic. For 20 meters LPF, 50 dB at second harmonic.

Will this be sufficient to meet the specification of 50 dBc (below carrier) as ITU-R and general brand name ham rigs.

ebay 120 USD 7 bands 100w lpf  Ukraine
https://www.ebay.com/itm/LPF-HF-50MHz-for-100W-SSPA-RD70HHF1-RD100HHF1-Low-Pass-Filter/332597645483?_trkparms=aid%3D222007%26algo%3DSIM.MBE%26ao%3D2%26asc%3D20160323102634%26meid%3Da0e263e6a67b4bbbaefd9df0ab021ce3%26pid%3D100623%26rk%3D4%26rkt%3D6%26sd%3D332643829840%26itm%3D332597645483&_trksid=p2047675.c100623.m-1

3W, 3 Transistors 25 USD
https://www.banggood.com/1MHz-1000MHZ-3W-35dB-Gain-HF-VHF-UHF-FM-Transmitter-RF-Power-Amplifier-for-RC-Models-p-1371055.html?rmmds=search&cur_warehouse=CN

3W, 2 Transistors 15 USD
https://www.ebay.com/itm/2018-2MHZ-700MHZ-3W-HF-VHF-UHF-FM-transmitter-RF-Power-Amplifier-For-Ham-Radio/202383791507?_trkparms=aid%3D555018%26algo%3DPL.SIM%26ao%3D1%26asc%3D20131003132420%26meid%3Dc2a67f1ca9544990a668dae157c730c8%26pid%3D100005%26rk%3D3%26rkt%3D3%26sd%3D173088889311%26itm%3D202383791507&_trksid=p2047675.c100005.m1851

EBAY 20W Ukraine 120 USD
https://www.ebay.com/itm/20W-HF-PA-20-watts-24v-HF-amplifier-for-HAM-radio-CW-SSB-FM-digital/332643829840?_trkparms=aid%3D333200%26algo%3DCOMP.MBE%26ao%3D1%26asc%3D55164%26meid%3D380c7c2779ed4329b906ede67cdb7acb%26pid%3D100752%26rk%3D2%26rkt%3D12%26sd%3D332237134236%26itm%3D332643829840&_trksid=p2047675.c100752.m1982

cased 10W Ukraine  120 USD
https://www.ebay.com/itm/CASED-10W-HF-PA-10-watts-13-5v-HF-amplifier-for-HAM-radio-CW-SSB-FM-WSPR/332848865480?_trkparms=aid%3D333200%26algo%3DCOMP.MBE%26ao%3D1%26asc%3D55164%26meid%3D5158720499e44a8490561d36c553b48e%26pid%3D100752%26rk%3D2%26rkt%3D12%26sd%3D332643829840%26itm%3D332848865480&_trksid=p2047675.c100752.m1982
Logged
Pages: [1]   Go Up
  Print  
 
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.11 | SMF © 2006-2009, Simple Machines LLC Valid XHTML 1.0! Valid CSS!