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References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*Topband\:\s+DHDL\s*$/: 6 ]

Total 6 documents matching your query.

1. Topband: DHDL (score: 1)
Author: Martin <dm4im@t-online.de>
Date: Sun, 30 Jun 2019 18:03:23 +0200
Topbanders, just read a few articles about DHDL antennas. One article states, the cut off frequency where the antenna becomes useless is when the overall length of wire reaches a 1/4WL. In my underst
/archives//html/Topband/2019-06/msg00040.html (6,459 bytes)

2. Re: Topband: DHDL (score: 1)
Author: GEORGE WALLNER <aa7jv@atlanticbb.net>
Date: Sun, 30 Jun 2019 13:29:14 -0400
Martin, Two things: 1. The antenna does not become "useless" when the loops are longer than 1/4 wave. It just won't work as a DHDL, but may still be useful as a low noise RX antenna. 2. The DHDL is a
/archives//html/Topband/2019-06/msg00041.html (8,369 bytes)

3. Re: Topband: DHDL (score: 1)
Author: Grant Saviers <grants2@pacbell.net>
Date: Sun, 30 Jun 2019 10:41:41 -0700
That statement doesn't agree with my quick modeling (I also wondered why my 40' base had some observed benefit on high bands now and then). Both a 60' for 160 and 40' for 80/40 worked fine. for a 60'
/archives//html/Topband/2019-06/msg00042.html (7,704 bytes)

4. Re: Topband: DHDL (score: 1)
Author: Paolo Zaffi <i4ewh1@tin.it>
Date: Sun, 30 Jun 2019 20:38:28 +0200
By the way the DHDL works good from 17 to 160 meters. I observed that during a test with and without preamplifier.  (DHDL don't need it, it was only a test) Paolo I4EWH _________________ Searchable A
/archives//html/Topband/2019-06/msg00043.html (6,998 bytes)

5. Re: Topband: DHDL (score: 1)
Author: Martin Kratoska <martin@ok1rr.com>
Date: Sun, 30 Jun 2019 20:51:11 +0200
That statement doesn't agree with my quick modeling just read a few articles about DHDL antennas. One article states, the cut off frequency where the antenna becomes useless is when the overall lengt
/archives//html/Topband/2019-06/msg00044.html (8,056 bytes)

6. Re: Topband: DHDL (score: 1)
Author: Martin Kratoska <martin@ok1rr.com>
Date: Sun, 30 Jun 2019 21:31:11 +0200
oops, the images didn't come thru. See here: http://www.ok1rr.com/public/DHDL_OPT.NEC http://www.ok1rr.com/public/antview.png http://www.ok1rr.com/public/dhdl_opt-ver.png http://www.ok1rr.com/public/
/archives//html/Topband/2019-06/msg00045.html (8,480 bytes)

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