UR5FFR

Радиолюбительские конструкции и программы
It is currently 23 Sep 2018, 04:32

All times are UTC + 2 hours




Post new topic Reply to topic  [ 3 posts ] 
Author Message
PostPosted: 07 Mar 2016, 23:08 
Offline
Site Admin

Joined: 21 Apr 2012, 21:00
Posts: 397
Location: Odessa
Позывной: UR5FFR
Низковисящий OCF диполь конфигурации 4+38,2м известен, но он не работает на диапазоне 80м. Если длинный луч укоротить трапом на 80ке то получится следующая 7ми диапазонная антенна

Attachment:
ocf 38-4 with trap for 80m.GIF
ocf 38-4 with trap for 80m.GIF [ 5.78 KiB | Viewed 6814 times ]


Антенна смоделирована для высоты подвеса 10м над реальной землей.

Attachment:
ocf 38-4 with trap for 80m - 80.png
ocf 38-4 with trap for 80m - 80.png [ 7.31 KiB | Viewed 6814 times ]


Attachment:
ocf 38-4 with trap for 80m - 40.png
ocf 38-4 with trap for 80m - 40.png [ 7.25 KiB | Viewed 6814 times ]


Attachment:
ocf 38-4 with trap for 80m - 20.png
ocf 38-4 with trap for 80m - 20.png [ 8.37 KiB | Viewed 6814 times ]


Attachment:
ocf 38-4 with trap for 80m - 17.png
ocf 38-4 with trap for 80m - 17.png [ 7.13 KiB | Viewed 6814 times ]


Attachment:
ocf 38-4 with trap for 80m - 15.png
ocf 38-4 with trap for 80m - 15.png [ 8.06 KiB | Viewed 6814 times ]


Attachment:
ocf 38-4 with trap for 80m - 12.png
ocf 38-4 with trap for 80m - 12.png [ 8.87 KiB | Viewed 6814 times ]


Attachment:
ocf 38-4 with trap for 80m - 10-1.png
ocf 38-4 with trap for 80m - 10-1.png [ 6.74 KiB | Viewed 6814 times ]


Attachment:
ocf 38-4 with trap for 80m - 10-2.png
ocf 38-4 with trap for 80m - 10-2.png [ 6.7 KiB | Viewed 6814 times ]


На 80м преобладает зенитное излучение, так что антенна применима в основном для местных связей


Attachments:
File comment: модель для MMANA
ocf 38-4 with trap for 80m.maa.zip [391 Bytes]
Downloaded 256 times
Top
 Profile  
 
PostPosted: 08 Mar 2016, 09:16 
Offline
Site Admin

Joined: 21 Apr 2012, 21:00
Posts: 397
Location: Odessa
Позывной: UR5FFR
Если нет желания мотать катушку трапа, то можно обойтись одним только конденсатором. Но при этом несколько повысится КСВ на диапазонах 80 и 10м

Attachment:
ocf 38-4 with C v2.GIF
ocf 38-4 with C v2.GIF [ 5.22 KiB | Viewed 6811 times ]


Attachment:
ocf 7 band - 80.png
ocf 7 band - 80.png [ 6.74 KiB | Viewed 6811 times ]


Attachment:
ocf 7 band - 40.png
ocf 7 band - 40.png [ 6.9 KiB | Viewed 6811 times ]


Attachment:
ocf 7 band - 20.png
ocf 7 band - 20.png [ 8.37 KiB | Viewed 6811 times ]


Attachment:
ocf 7 band - 17.png
ocf 7 band - 17.png [ 6.99 KiB | Viewed 6811 times ]


Attachment:
ocf 7 band - 15.png
ocf 7 band - 15.png [ 8.13 KiB | Viewed 6811 times ]


Attachment:
ocf 7 band - 12.png
ocf 7 band - 12.png [ 8.82 KiB | Viewed 6811 times ]


Attachment:
ocf 7 band - 10-2.png
ocf 7 band - 10-2.png [ 6.73 KiB | Viewed 6811 times ]


Top
 Profile  
 
PostPosted: 12 Nov 2017, 13:12 
Offline
Site Admin

Joined: 21 Apr 2012, 21:00
Posts: 397
Location: Odessa
Позывной: UR5FFR
При выборе этой конструкции надо учитывать, что из-за низкой высоты подвеса у антенны преобладает зенитное излучение, а на ВЧ-бендах диаграмма направленности становится многолепестковой. Ниже приведены ДН по диапазонам для OCF с трапом

Attachment:
ocf 38-4 with trap for 80m - 80 ДН.png
ocf 38-4 with trap for 80m - 80 ДН.png [ 24.76 KiB | Viewed 2339 times ]


Attachment:
ocf 38-4 with trap for 80m - 40 ДН.png
ocf 38-4 with trap for 80m - 40 ДН.png [ 23.78 KiB | Viewed 2339 times ]


Attachment:
ocf 38-4 with trap for 80m - 20 ДН.png
ocf 38-4 with trap for 80m - 20 ДН.png [ 24.78 KiB | Viewed 2339 times ]


Attachment:
ocf 38-4 with trap for 80m - 15 ДН.png
ocf 38-4 with trap for 80m - 15 ДН.png [ 25.6 KiB | Viewed 2339 times ]


Attachment:
ocf 38-4 with trap for 80m - 10 ДН.png
ocf 38-4 with trap for 80m - 10 ДН.png [ 26.22 KiB | Viewed 2339 times ]


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 3 posts ] 

All times are UTC + 2 hours


Who is online

Users browsing this forum: No registered users and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
cron
Powered by phpBB® Forum Software © phpBB Group