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21MHz 1/2波長 ツェップ アンテナ  自作 未使用
 
        

仮調整済/即使用可能

防水対策済/エレメント3.5SQに強度UP

マッチング調整

インピーダンス50Ω整合確認

マッチング調整時のSWR1.5下限

マッチング調整時のSWR1.5上限

現物設置調整風景

図面添付

  • Product Quantity
    : 1
  • Starting Bid
    :5,000円
  • Highest Bidder
    : / Rating:
  • Listing Date
    :2026年01月20日 19時50分
  • Bidding closes on
    :2026年01月27日 19時49分
  • Auction Number
    :o1172044058
  • Condition
    :New product
  • Automatic Extension
    :No
  • Authentication
    :Yes(Description)
  • Early Closing
    :Yes
  • Can I return the product?
    :no
  • Description
  • Q&A ()
  • Cost Estimator
  • Problem Item Response Procedur
Notes
  1. Radio communications related products (import and export documents required) cannot be assisted in importing.
■21MHz 1/2波長フルサイズ ツェップアンテナ、全長約6.2mです。

設置は(水平/傾斜/折り曲)と自由度があり調整も一か所で素早くでき大変楽です。

マッチングBOXは全天候タイプで防水/強度対策も充分な作りとなっています。

※エレメントは在庫状況で「青、緑、黑」になりますので了解ください。

自宅環境下で調整済です、この調整は設置環境により変わる場合あるので再調整が必要です。

エレメントを延長すれば18M帯にも同調出来る広帯域マッチングBOXコイル仕様になっています。

バンド中心付近で最良点に調整時SWR1.5の範囲は周波数下限20.515MHz~上限21.879MHzの帯域幅1.364KHzです。

高給部は高耐圧セラミックコンデンサー6KV使用しています、安全上の為(PEP)200W以下でご使用ください。

商品は全て設置テストしてから出荷しています。

ハンドメイド品のため製作上のキズあることをご了解ください。製作上の瑕疵以外はNC/NRとなります。

※写真はイメージです

【設置と調整に付いて】

このアンテナは1/2λワイヤーアンテナです。
電圧腹給電で働くためインピーダンスが非常に高く50Ωの同軸ケーブルでは直接給電できません。その為に、高圧に耐えるコイルルとコンデンサー(LC回路)で構成された整合器(給電部)が必要です。
給電部はそれぞれのバンド専用につき、他のバンドには整合しません。
ダイポールアンテナに比べ、設置が容易なことが特徴です、ダイポールアンテナでは開く角度でインピーダンスが変化します、調整も両端で調整しますが、このアンテナは、先端の折り返し1ヶ所の調整で済みます。

【設置】
  1. アンテナは出来るだけ地上高く設置して下さい。
  2. 展張にはクレモナロープがお勧めです、長年の使用に耐えます。
  3. 地面やタワー、立木、建物等の影響物から少なくとも1/8λ以上離さないとアンテナの同調点が掴めません。
  4. 水平、垂直、斜め、くの字(直角まで)に曲げて使用できます。
  5. アンテナを垂直にすると無指向性、水平にした場合、指向特性はアンテナ線に、ほぼ直角の方向に得られます。電波の輻射は電流腹となるエレメント線中央部が一番強くなります。


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Product Price JPY
Japanese Consumption Tax(10%) JPY

A 10% consumption tax is applied to goods and services in Japan. The price may include the tax or it may be added separately. Please check the price details when ordering.

Note: This is a domestic sales tax applied within Japan.

Japan Local Shipping Fee JPY Japan Local Shipping Fee Reference
Product Weight KG The maximum weight limit is 30 kg
International Shipping Methods
Proxy bidding and purchasing services are becoming increasingly convenient. However, overseas shopping carries certain risks and issues. To reduce these risks and enhance shopping safety, please be sure to read the following information:

1. International Shipping

   Air Freight: If the item status is not confirmed within two days after the arrival notice, any customer complaints cannot be addressed with the seller.

2. After Receiving the Product

Please confirm and inspect the product as soon as possible to ensure that the product specifications, quantity, accessories, and description are correct

If, unfortunately, there are any issues, you can refer to the following examples on how to report related product problems:
1. Example of missing product information
2. Example of product not matching provided information
3. Example of damaged product information

Important Notes: 1. If the seller is unwilling to ship overseas or is unaware that the product will be shipped overseas, the international shipping cost for returns or exchanges will need to be borne by the member. You may refer to the EMS e-Express fee inquiry from the post office. If it involves alcoholic beverages or items that affect flight safety, the post office cannot be used for shipment, and only DHL can be used to ship back to Japan.
2. During the product complaint handling period, please retain the complete outer packaging of the product (including the shipping label information), and refrain from attempting any repairs or altering the original condition. Any modifications may result in the inability to process the case.

3. After Inspecting the Product

After receiving and inspecting the item, if you have any questions, it is recommended to contact Letao within 2 hours. Here are some reminders:

1. Please do not unpack, use or repair the received item yourself, and be sure to keep the original packaging to facilitate subsequent handling of related matters, so as to avoid changes to the item that may cause the seller to be unwilling to process.

2. You can call customer service, and the customer service will leave a message for you as below. Please provide the following information:
"Hello, we will first help you establish a complaint case for Product ID: _______ .But we need you to 2-3 clear photos of the product issue, including photos of the product problem, product packaging, shipping details slip, and outer box. Send them to service@letao.my and inform us of your desired resolution (failing to provide this may result in an inability to process subsequent matters). After sending the email, notify us in the customer service message. We will confirm with the seller as soon as possible. and if there are any related questions, we will contact you through the customer service message. Thank you for your cooperation."

Please provide:
1. "Product ID"
2. Photo of the "Delivery Note" (if any)
3. Photos of the outer box (including inner and outer packaging)
4. Photos of the product (Please include relevant descriptions to help us confirm with the seller)

Important Notes:
1. Do not include foreign text or other products in the background of the image.
2. Please keep the complete product packaging (including the shipping label information), and refrain from repairing or altering the original condition on your own, as any changes may result in the case being unable to be processed.
3. Please provide the relevant information within 48 hours to avoid missing the golden hour for reflection and causing situations that cannot be handled.
4. Due to 99% of Japanese sellers being unwilling or unaware of shipping goods overseas, if a seller is willing to handle the issue, the goods must be sent back to Japan, and the international shipping costs incurred must be borne by the member. Letao will use postal EMS international express to send the goods back to Japan.
5. As the goods are purchased from overseas, it may take approximately one to two weeks to complete the relevant processing procedures when issues arise with the goods. Please be reminded that you can inquire about the approximate cost through the EMS service at the post office.

4. FAQ

1. Issue of Authenticity: If antique or branded goods are found to be counterfeit upon receipt, clear photos showing the differences between the genuine product and the imitation must be provided as evidence. If unable to provide relevant proof, assistance can be sought to find a third-party reputable organization for a premium authentication service .
2. Leaking Iron Teapot: If an antique iron teapot is leaking, please take clear photos of the leaking area and provide them.
3. Transport Damage: If the goods are damaged during international shipping (to the pickup point), you need to provide photos of the outer packaging of the parcel and clear photos of the damaged goods' outer packaging.

※ Note: Photos provided to sellers should not contain any foreign-related information.
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    Product name: 21MHz 1/2波長 ツェップ アンテナ  自作 未使用
    Notes:
    Customer service hours:
    • Monday to Friday 10:00-18:00
    Customer service hotline:
    Customer Service Email: service@letao.my