Question regarding BL2 250W 1:1/4:1 switchable Balun

[Tom McCulloch]

I was about to order the BL1 balun, but once again have procrastinated.  Is it save to say that if I buy the BL2, I won't be needing the BL1? (Sometimes it pays to put things off!)

Tom, WB2QDG
K2 1103


 -------------- Original message ----------------------
From: "Eric Swartz - WA6HHQ, Elecraft" <[hidden email]>

> We've just added two new Mini-modules to our Mini-module family
> --
>
> BL2 Wideband 1:1 & 4:1 (Switchable) 250W Balun
>
> Our highly-efficient BL2 balun can handle up to 250 watts and can handles 1:1
> and 4:1 ratios via an on board switch. It  is very small (just 1.5 x 3") and
> lightweight, making it an excellent choice for both home and field use. It uses
> a special winding technique to reduce losses and extend the useful range,
> resulting in an SWR of less than 1.2:1 from 500 kHz to 55 MHz (200-ohm load). It
> includes rugged screw terminals for the balanced output as well as ground, and
> can be used in a variety of matching applications.
>
> Price: $34.95
>
> Specifications:
>
> Power Rating: 250 watts maximum.Bandwidth: Input VSWR less than 1.2 when
> connected to a 200 resistive load, 500 kHz to 55 MHz.
> --
>
>
> CP1 Directional Coupler
>
> The CP1 is a dual directional coupler that provides high directivity, can be
> internally or externally terminated and can be constructed with a coupling loss
> of either 20 dB or 30 dB. It can be used to sample a transmitter's forward power
> and reflected power output. As an example the forward power port can be
> connected to an oscilloscope for display of the transmit envelope. It is an
> ideal companion to the 2T-Gen 2 Tone test generator. For more advanced
> applications is can be used with a spectrum analyzer and tracking generator to
> sweep the return loss (SWR) of an antenna or other device in real time over a
> frequency range.
>
> Price: $39.00
>
> Specifications:
>
> Frequency Range: 1 MHz to 30 MHz
> Coupling Loss: 20 dB or 30 dB (29.8) +/- 0.25 dB
> Directivity: 30 dB
> Power Rating: 30 dB coupler, 250 W; 20 dB coupler, 25 W
> ---
>
> For pictures and downloadable manuals, see:
> http://www.elecraft.com/mini_module_kits/mini_modules.htm
>
> Both items are in stock for immediate shipment.
>
> 73, Eric   WA6HHQ
>
>
>
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[wayne burdick]

> I was about to order the BL1 balun, but once again have
> procrastinated.  Is it save to say that if I buy the BL2, I won't be
> needing the BL1? (Sometimes it pays to put things off!)
>
> Tom, WB2QDG
> K2 1103

Hi Tom,

The BL2 does exactly the same thing as the BL1, but handles more power
(up to 250 watts) and has a 1:1/4:1 switch. Both baluns have the same
very flat response from 500 kHz to 55 MHz. If you think you'll ever use
more than 100 W, or if you routinely use 100 W with high-SWR loads, I'd
go with the BL2, which uses a core that's twice as large as the BL1's.

73,
Wayne
N6KR

---

http://www.elecraft.com

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