打算购置一台TKM-707或者IC-725A，707这种老船台，目前计划使用5.6米的GP拉杆天线，主要使用20米波段，如果使用外置天调的话可不可以不使用网分仪对天线阵子长度进行微调

天分的价格也不贵，配一个无妨，光有天调也不行呀，虽然天调能拉低，但是在不同波段上你是要依靠天调去找你的协振点的，总不能5.6米全部拉开后考天调去帮你调谐各波段吧。说实话，感觉天分比天调重要

天分的价格也不贵，配一个无妨，光有天调也不行呀，虽然天调能拉低，但是在不同波段上你是要依靠天调去找你的协振点的，总不能5.6米全部拉开后考天调去帮你调谐各波段吧。说实话，感觉天分比天调重要 @"[未知用户]"#p65309

网分要有，天调可以没有，尽量自然谐振，别调都没调好就拿天调拉，不然拉5.6米就没意义了

要是有好价的at120（低于230）可以入然后连长线的地方可以连拉杆调，但是不建议搞这些我的老船台ic78用的是atu100我就微调把1.6的驻波调到1.1

五米六的拉杆全拉开的频率基本就是20米波段的常用频率，比如最外面的外壳是第一节，从粗到细以此类推的话，第九节拉出20cm左右谐振10米波段，第七节拉出20cm左右谐振15米波段，大概就是这个规律，也不是一定要非常准确。

@"[未知用户]"#p68180 地网拉不好就不一样了

Shortwave tuning issues: Is it possible to operate without a network analyzer?

BH2XSM

I'm planning to purchase either a TKM-707 or an IC-725A. The 707, being an older model, is currently planned for use with a 5.6-meter GP whip antenna, primarily operating in the 20-meter band. If I were to use an external antenna tuner, could I avoid using a network analyzer to fine-tune the length of the antenna array?

bh1cqz

The price of a tuner isn't too high, and it's definitely helpful to have one. However, having just a tuner alone won't be enough. While a tuner can help lower the frequency, you still need to rely on it to find your resonant points in different bands. You wouldn't want to completely depend on the tuner after pulling all the frequencies apart, would you? Honestly, I feel that a tuner is more important than a tuner.

BH9FPK

Sky Tune + Long-term plan

BG4IJK

The grid division is essential, but the celestial tuning can be optional. Aim for natural resonance as much as possible, and don't use the celestial tuning if it hasn't been properly adjusted first. Otherwise, pulling on a 5.6-meter cable would be pointless.

BG5DZG

If I can find a good deal on an AT120 (below $230), I can buy one and connect it to the existing wiring, allowing me to adjust the pull-rod for fine tuning. However, I don't recommend doing this with my older boat, which uses an ATU100. Instead, I just made a small adjustment to bring the 1.6 MHz standing wave down to 1.1 MHz.

BG2EWI

The frequency at which a 6.6-meter pull-out lever is fully extended corresponds to the common frequencies in the 20-meter band, such as: if the outermost section is the first, and the sections are arranged from coarse to fine, then pulling out the ninth section will resonate with a 10-meter waveband of approximately 20cm, and pulling out the seventh section will resonate with a 15-meter waveband of approximately 20cm. This is roughly the pattern, and it doesn't need to be extremely accurate.

BG5DZG

[未知用户] If the ground network connection fails, it will be a different situation.

NB6G

It's crucial not to overlook the network analyzer! It can not only adjust the SWR, but also help you find the optimal angle (assuming you want to transmit or receive in a specific direction), and the GP antenna can even analyze potential problems with the antenna itself.

I used the GP antenna to initially find a section with relatively low SWR, such as on the 20m band. Using a network analyzer, I was able to adjust it to around 1.2. At this point, I could achieve excellent results without even adjusting the antenna; the voice quality was clear and loud, and I could directly connect to Europe, South America, and even Bulgaria.

SkyTune is essentially a supplementary feature, and the improvement in SWR from 1.2 to around 1.0 is not significant unless others have difficulty understanding me or there are other issues. In those cases, SkyTune is used less frequently.

BD6OC

5.6-meter GP whip antenna, which allows for easy adjustment of the resonant length, making it easy to achieve low standing wave ratios.

BD6OC

If it can naturally resonate and achieve better results, do not use the "sky adjustment" to pull it down.

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