[TowerTalk] Need info on balun for Hygain TH-7DX antenna

[Billy Cox]

Hi Mike,

Totally agree, but those were the OEM suggested units and provide 
the needed technical first answer as to 1:1 or 4:1 ratio designs.

For low power, low duty cycle ... either unit probably still OK.

For home brew units ... look at K9YC's information to build one.
For off the shelf units ... look at DXEngineering or similar.

73 de Billy, AA4NU

> On April 2, 2020 at 4:16 PM W0MU Mike Fatchett <w0mu at w0mu.com> wrote:
> 
> Those baluns were and probably still are pretty bad.  Many other better 
> solutions available.
> 
> On 4/2/2020 2:18 PM, Billy Cox wrote:
> > Hi Ray, yes, that is true as to the dual driven element KLM/M2 antennnas.
> >
> > But the THx series uses the older BN86/newer BN4000 units, which are 1:1.
> >
> > 73 de Billy, AA4NU
> >
> >
> >> On April 2, 2020 at 3:11 PM Raymond Benny <rayn6vr at gmail.com> wrote:
> >>
> >>
> >> If its feeding a dipole type antenna, which your antenna is,  you need a
> >> 1:1balun. 1:1 matches 50 ohm coax to the dipole element, which is near 50
> >> ohms.
> >>
> >>   If it is a dual driven element then use a 4:1 balun. Dual driven element
> >> impedance is near 200 ohm and is transforms 50 ohm for the coax.
> >>
> >> Ray
> >> N6VR
> >>
> >> On Thu, Apr 2, 2020, 1:01 PM Mark Pride via TowerTalk <
> >> towertalk at contesting.com> wrote:
> >>
> >>> Pretty certain its 1:1
> >>>
> >>> Regards,
> >>>
> >>>   Mark, K1RX
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>      On Thursday, April 2, 2020, 04:00:21 PM EDT, <marsh at ka5m.net> wrote:
> >>>
> >>>   It never ceases to amaze me how much basic technical information is NOT in
> >>> product manuals.
> >>>
> >>> 73,
> >>> Marsh, KA5M
> >>>
> >>>
> >>>
> >>> -----Original Message-----
> >>> From: TowerTalk <towertalk-bounces at contesting.com> On Behalf Of Phil
> >>> Sent: Thursday, April 02, 2020 2:26 PM
> >>> To: towertalk at contesting.com
> >>> Subject: [TowerTalk] Need info on balun for Hygain TH-7DX antenna
> >>>
> >>> It appears that the balun on my TH-7 has died.  Can someone please tell me
> >>> if this is a 4:1 balun....the Hygain manual is silent on this subject as
> >>> far
> >>> as I can tell.
> >>>
> >>> thanks, 73, Phil  W5BVB
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